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Influence of Transparent Anode on Luminescent Performance of Near-infrared Organic Light-emitting Diodes 被引量:2
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作者 GUAN He-song CHENG Chuan-hui +6 位作者 LI Wan-cheng GENG Dong-feng FAN Zhao-qi CHANG Yu-chun ZHAO Wang GUO Zhen-qiang DU Guo-tong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第6期786-790,共5页
The optical transmission(200--2000 nm), sheet resistance and work functions of indium-tin oxide(ITO)(100 Ω/), ITO(12 Ω/), zinc-oxide(ZnO), aluminum-doped ZnO(AZO) and polyaniline(PANI) films were inves... The optical transmission(200--2000 nm), sheet resistance and work functions of indium-tin oxide(ITO)(100 Ω/), ITO(12 Ω/), zinc-oxide(ZnO), aluminum-doped ZnO(AZO) and polyaniline(PANI) films were investigated. Near-infrared organic light-emitting diodes(NIR-OLEDs) emitting around 1.54 μm based on Er(DBM)3Phen with ITO(100 Ω/), ITO(12 Ω/) and PANI as anodes, respectively, were fabricated. The device structure was anode/4"-tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine(m-MTDATA)/ N,N'-di-l-naphthyl- N,N'-diphenylbenzidine(NPB)/Er(DBM)3Phen/tris-(8-hydroxyquinoline) aluminum(Alq3)/A1. The results suggest that the performance of NIR-OLEDs with ITO(100 Ω/), which has a lower Sn content, as anodes appear to be better than that of NIR-OLEDs with ITO(12 Ω/) and PANI as anodes, respectively. The high N1R transmittance of ITO(100 Ω/) is a major reason for the relatively high NIR EL efficiency. The more balanced holes and electrons in the device based on ITO(100 Ω/) are another reasons. 展开更多
关键词 transparent electrode Near-infrared(NIR) organic light-emitting diode(OLED)
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Organic Light Emitting Diodes with p-Si Anodes and Semitransparent Ce/Au Cathodes
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作者 孙志国 姜广智 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第2期208-211,共4页
The Ce (x nm)/Au (15 nm) stacked layers were used as semitransparent cathodes in the top-emission organic light emitting devices (TOLEDs) fabricated on a p-type silicon anodes and substrate,where x varies from 4... The Ce (x nm)/Au (15 nm) stacked layers were used as semitransparent cathodes in the top-emission organic light emitting devices (TOLEDs) fabricated on a p-type silicon anodes and substrate,where x varies from 4 to 16.The consequence of the Ce layer thickness on transmittance and the device performance were studied when the organic layers NPB (60 nm)/ALQ (60 nm) were kept unchanged,where NPB was N,N'-bis-(1-naphthl)-diphenyl-1,1'-biphenyl-4,4'-diamine,and AlQ is tris-(8-hydroxyquinoline) aluminum.The cathode of Ce (11 nm)/Au (15 nm) has a transparency of 46%,and the TOLED with it achieves the highest luminescence efficiencies:a current efficiency of 0.91 cd/A at 13.7 V and a peak power efficiency of 0.28 lm/W at 9 V.The turn-on voltage is 3.0 V.The Ce/Au cathode is both chemically and electrically stable. 展开更多
关键词 organic light emitting device transparent cathode CE
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Very-High Color Rendering Index Hybrid White Organic Light-Emitting Diodes with Double Emitting Nanolayers 被引量:4
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作者 Baiquan Liu Miao Xu +6 位作者 Lei Wang Hong Tao Yueju Su Dongyu Gao Linfeng Lan Jianhua Zou Junbiao Peng 《Nano-Micro Letters》 SCIE EI CAS 2014年第4期335-339,共5页
A very-high color rendering index white organic light-emitting diode(WOLED) based on a simple structure was successfully fabricated. The optimized device exhibits a maximum total efficiency of 13.1 and 5.4 lm/W at 1,0... A very-high color rendering index white organic light-emitting diode(WOLED) based on a simple structure was successfully fabricated. The optimized device exhibits a maximum total efficiency of 13.1 and 5.4 lm/W at 1,000 cd/m2. A peak color rendering index of 90 and a relatively stable color during a wide range of luminance were obtained. In addition, it was demonstrated that the 4,40,400-tri(9-carbazoyl) triphenylamine host influenced strongly the performance of this WOLED.These results may be beneficial to the design of both material and device architecture for high-performance WOLED. 展开更多
关键词 White light HYBRID Color rendering index organic light-emitting diodes Double emitting nanolayers
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Organic Light Emitting Diodes with Lithium Contained Alq3 as Electron Injection Layer 被引量:2
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作者 Zugang Liu J.L.Pinto 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2002年第2期121-123,共3页
lNovel lithium doped tris 8 hydroxylquinoline aluminium(Alq3:Li) layer is deposited between emission layer and electron injection aluminium electrode as an electron injection assistant layer in different organic lig... lNovel lithium doped tris 8 hydroxylquinoline aluminium(Alq3:Li) layer is deposited between emission layer and electron injection aluminium electrode as an electron injection assistant layer in different organic light emitting diodes(OLED) to lower the electron injection barrier. In these devices, Alq3 is used as emission layer, and a bilayer film of N,N bis (1 naphhyl) N,N diphenyl 1,1 biphenyle 4,4' diamine(NPB) and 4,4,4' tris(3 methyl phenylphenylamino) triphenylamine( m MTDATA) used as hole transport layer(HTL). The electroluminescent performance of devices with different thicknesses of Alq3∶Li shows that the insertion of the lithium doped Alq3 layer can reduce the turn on voltage by at least 2 volts, and the stability of devices with this lithium doped Alq3 layer is improved too. It can also change the efficiency of devices. Compared with an ultra thin lithium fluoride(LiF) layer, Alq3∶Li sheet gives similar effects but higher efficiency and can be much thicker and hence it is easier to control the deposition. 展开更多
关键词 organic light emitting diodes Lithium layer ALQ3 EI
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Organic light emitting diodes using magnesium doped organic acceptor as electron injection layer and silver as cathode 被引量:2
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作者 曹国华 秦大山 +3 位作者 关敏 曹峻松 曾一平 李晋闽 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第5期1911-1915,共5页
Organic light emitting diodes employing magnesium doped electron acceptor 3, 4, 9, 10 perylenetetracarboxylic dianhydride (Mg:PTCDA) as electron injection layer and silver as cathode were demonstrated. As compared ... Organic light emitting diodes employing magnesium doped electron acceptor 3, 4, 9, 10 perylenetetracarboxylic dianhydride (Mg:PTCDA) as electron injection layer and silver as cathode were demonstrated. As compared to Mg : Ag cathode, the combination of the Mg : PTCDA layer and silver provided enhanced electron injection into tris (8- quinolinolato) aluminium. The device with 1 : 2 Mg : PTCDA and Ag showed an increase of about 12% in the maximum current efficiency, mainly due to the improved hole-electron balance, and an increase of about 28% in the maximum power efficiency, as compared to the control device using Mg : Ag cathode. The properties of Mg : PTCDA composites were studied as well. 展开更多
关键词 organic light emitting diodes Mg:PTCDA electron injection
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Pure blue and white light electroluminescence in a multilayer organic light-emitting diode using a new blue emitter 被引量:1
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作者 魏娜 郭坤平 +3 位作者 周朋超 于建宁 魏斌 张建华 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第7期727-731,共5页
We characterized the 6,12-bis{[N-(3,4-dimethylphenyl)-N-(2,4,5-trimethylphenyl)]amino} chrysene (BmPAC), which has been proven to be a blue fluorescent emission with high EL efficiency. The blue fluorescent devi... We characterized the 6,12-bis{[N-(3,4-dimethylphenyl)-N-(2,4,5-trimethylphenyl)]amino} chrysene (BmPAC), which has been proven to be a blue fluorescent emission with high EL efficiency. The blue fluorescent device exhibits good performance with an external quantum efficiency of 5.8% and current efficiency of 8.9 cd/A, respectively. Using BmPAC, we also demonstrate a hybrid phosphorescence/fluorescence white organic light-emitting device (WOLED) with high efficiency of 36.3 cd/A. In order to improve the relative intensity of blue light, we plus a blue light-emitting layer (BEML) in front of the orange light emitting layer (YEML) to take advantage of the excess singlet excitons. With the new emitting layer of BEML/YEML/BEML, we demonstrate the fluorescence/phosphorescence/fluorescence WOLED exhibits good performance with a current efficiency of 47 cd/A and an enhanced relative intensity of blue light. 展开更多
关键词 BmPAC high efficiency blue organic light emitting diodes white organic light-emitting diodes
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High color rendering index white organic light-emitting diode using levofloxacin as blue emitter 被引量:1
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作者 苗艳勤 高志翔 +5 位作者 张爱琴 李源浩 王华 贾虎生 刘旭光 Tsuboi Taiju 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第5期577-582,共6页
Levofloxacin (LOFX), which is well-known as an antibiotic medicament, was shown to be useful as a 452-nm blue emitter for white organic light-emitting diodes (OLEDs). In this paper, the fabricated white OLED conta... Levofloxacin (LOFX), which is well-known as an antibiotic medicament, was shown to be useful as a 452-nm blue emitter for white organic light-emitting diodes (OLEDs). In this paper, the fabricated white OLED contains a 452-nm blue emitting layer (thickness of 30 nm) with 1 wt% LOFX doped in CBP (4,4'-bis(carbazol-9-yl)biphenyl) host and a 584-nm orange emitting layer (thickness of 10 nm) with 0.8 wt% DCJTB (4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7- tetramethyljulolidin-4-yl-vinyl)-4H-pyran) doped in CBE which are separated by a 20-nm-thick buffer layer of TPBi (2,2',2"-(benzene-1,3,5-triyl)-tri(1-phenyl-lH-benzimidazole). A high color rendering index (CRI) of 84.5 and CIE chromaticity coordinates of (0.33, 0.32), which is close to ideal white emission CIE (0.333, 0.333), are obtained at a bias voltage of 14 V. Taking into account that LOFX is less expensive and the synthesis and purification technologies of LOFX are mature, these results indicate that blue fluorescence emitting LOFX is useful for applications to white OLEDs although the maximum current efficiency and luminance are not high. The present paper is expected to become a milestone to using medical drug materials for OLEDs. 展开更多
关键词 LEVOFLOXACIN blue organic light emitting diodes white organic light-emitting diodes high color rendering index
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Enhancing The Efficiency of White Organic Light-emitting Diode Using Energy Recyclable Photovoltaic Cells 被引量:2
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作者 Meiso YOKOYAMA WU Chung-ming SU Shui-hsiang 《发光学报》 EI CAS CSCD 北大核心 2012年第1期1-6,共6页
We demonstrate that power recycling is feasible by using a semi-transparent stripped Al electrode as interconnecting layer to merge a white organic light-emitting devices(WOLED) and an organic photovoltaic(OPV) cell.T... We demonstrate that power recycling is feasible by using a semi-transparent stripped Al electrode as interconnecting layer to merge a white organic light-emitting devices(WOLED) and an organic photovoltaic(OPV) cell.The device is called a PVOLED.It has a glass / ITO / CuPc / m-MTDATA ∶ V 2 O 5 / NPB / CBP ∶ FIrpic ∶ DCJTB / BPhen / LiF / Al / P3HT∶ PCBM / V 2 O 5 / Al structure.The power recycling efficiency of 10.133% is achieved under the WOLED of PVOLED operated at 9 V and at a brightness of 2 110 cd / m 2,when the conversion efficiency of OPV is 2.3%.We have found that the power recycling efficiency is decreased under high brightness and high applied voltage due to an increase input power of WOLED.High efficiency(18.3 cd / A) and high contrast ratio(9.3) were obtained at the device operated at 2 500 cd / m 2 under an ambient illumination of 24 000 lx.Reasonable white light emission with Commission Internationale De L'Eclairage(CIE) color coordinates of(0.32,0.44) at 20 mA / cm 2 and slight color shift occurred in spite of a high current density of 50 mA / cm 2.The proposed PVOLED is highly promising for use in outdoors display applications. 展开更多
关键词 white organic light-emitting diode contrast ratio organic photovoltaic cell PVOLED
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Thermal Analysis of Organic Light Emitting Diodes Based on Basic Heat Transfer Theory 被引量:1
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作者 张稳稳 吴朝新 +3 位作者 刘迎文 董军 严学文 侯洵 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第8期139-143,共5页
We investigate the thermal characteristics of standard organic light-emitting diodes (OLEDs) using a simple and clear 1D thermal model based on the basic heat transfer theory. The thermal model can accurately estima... We investigate the thermal characteristics of standard organic light-emitting diodes (OLEDs) using a simple and clear 1D thermal model based on the basic heat transfer theory. The thermal model can accurately estimate the device temperature, which is linearly with electrical input power. The simulation results show that there is almost no temperature gradient within the OLED device working under steady state conditions. Furthermore, thermal analysis simulation results show that the surface properties (convective heat transfer coetficient and surface emissivity) of the substrate or cathode can significantly affect the temperature distribution of the OLED. 展开更多
关键词 OLEDS Thermal Analysis of organic light emitting diodes Based on Basic Heat Transfer Theory EML
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Regulating Charge and Exciton Distribution in High-Performance Hybrid White Organic Light-Emitting Diodes with n-Type Interlayer Switch 被引量:1
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作者 Dongxiang Luo Yanfeng Yang +3 位作者 Ye Xiao Yu Zhao Yibin Yang Baiquan Liu 《Nano-Micro Letters》 SCIE EI CAS 2017年第4期3-10,共8页
The interlayer(IL) plays a vital role in hybrid white organic light-emitting diodes(WOLEDs); however,only a negligible amount of attention has been given to n-type ILs. Herein, the n-type IL, for the first time,has be... The interlayer(IL) plays a vital role in hybrid white organic light-emitting diodes(WOLEDs); however,only a negligible amount of attention has been given to n-type ILs. Herein, the n-type IL, for the first time,has been demonstrated to achieve a high efficiency, high color rendering index(CRI), and low voltage trade-off.The device exhibits a maximum total efficiency of 41.5 lm W^(-1), the highest among hybrid WOLEDs with n-type ILs. In addition, high CRIs(80–88) at practical luminances(C1000 cd m^(-2)) have been obtained, satisfying the demand for indoor lighting. Remarkably, a CRI of 88 is the highest among hybrid WOLEDs. Moreover, the device exhibits low voltages, with a turn-on voltage of only 2.5 V([1 cd m^(-2)), which is the lowest among hybrid WOLEDs. The intrinsic working mechanism of the device has also been explored; in particular, the role of n-type ILs in regulating the distribution of charges and excitons has been unveiled. The findings demonstrate that the introduction of n-type ILs is effective in developing high-performance hybrid WOLEDs. 展开更多
关键词 White light HYBRID INTERLAYER Color rendering index organic light-emitting diodes
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White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends 被引量:1
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作者 陈飞鹏 徐斌 +3 位作者 赵祖金 田文晶 吕萍 Im Chan 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第3期546-550,共5页
White organic light-emitting diodes with a blue emitting material fluorene-centred ethylene-liked carbazole oligomer (Cz6F) doped into polyvinyl carbazole (PVK) as the single light-emitting layer are reported. The... White organic light-emitting diodes with a blue emitting material fluorene-centred ethylene-liked carbazole oligomer (Cz6F) doped into polyvinyl carbazole (PVK) as the single light-emitting layer are reported. The optical properties of Cz6F, PVK, and PVK:Cz6F blends are studied. Single and double layer devices are fabri- cated by using PVK: Cz6F blends, and the device with the configuration of indium tin oxide (ITO)/PVK:Cz6F/ tris(8-hydroxyquinolinate)aluminium (Alq3)/LiF/A1 exhibits white light emission with Commission Internationale de l'Eclairage chromaticity coordinates of (0.30, 0.33) and a brightness of 402 cd/m^2. The investigation reveals that the white light is composed of a blue-green emission originating from the excimer of Cz6F molecules and a red emission from an electroplex from the PVK:Cz6F blend films. 展开更多
关键词 white organic light-emitting diodes ELECTROLUMINESCENCE electroplex
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Fine-tuning the thicknesses of organic layers to realize high-efficiency and long-lifetime blue organic light-emitting diodes 被引量:1
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作者 于建宁 张民艳 +4 位作者 李崇 尚玉柱 吕燕芳 魏斌 黄维 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第8期186-190,共5页
By using p-bis(p - N, N-diphenyl-aminostyryl)benzene doped 2-tert-butyl-9, 10-bis-β-naphthyl)-anthracene as an emitting layer, we fabricate a high-efficiency and long-lifetime blue organic light emitting diode wit... By using p-bis(p - N, N-diphenyl-aminostyryl)benzene doped 2-tert-butyl-9, 10-bis-β-naphthyl)-anthracene as an emitting layer, we fabricate a high-efficiency and long-lifetime blue organic light emitting diode with a maximum external quantum efficiency of 6.19% and a stable lifetime at a high initial current density of 0.0375 A/cm2. We demonstrate that the change in the thicknesses of organic layers affects the operating voltage and luminous efficiency greater than the lifetime. The lifetime being independent of thickness is beneficial in achieving high-quality full-colour display devices and white lighting sources with multi-emitters. 展开更多
关键词 organic light-emitting diode blue emission LIFETIME organic layers thickness
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The performance enhancement in organic light-emitting diode using a semicrystalline composite for hole injection 被引量:1
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作者 曹峻松 关敏 +3 位作者 曹国华 曾一平 李晋闽 秦大山 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第7期2725-2729,共5页
A semicrystalline composite, 3, 4, 9, 10 perylenetetracarboxylic dianhydride (PTCDA) doped N,N'-di(1-naphthyl)- N,N'-diphenylbenzidine (NPB), has been fabricated and characterized. An organic light-emitting di... A semicrystalline composite, 3, 4, 9, 10 perylenetetracarboxylic dianhydride (PTCDA) doped N,N'-di(1-naphthyl)- N,N'-diphenylbenzidine (NPB), has been fabricated and characterized. An organic light-emitting diode using such a composite in hole injection exhibits the improved performance as compared with the reference device using neat NPB in hole injection. For example, at a luminance of 2000 cd/m2, the former device gives a current efficiency of 2.0cd/A, higher than 1.6cd/A obtained from the latter device. Furthermore, the semicrystalline composite has been shown thermally to be more stable than the neat NPB thin film, which is useful for making organic light emitting diodes with a prolonged lifetime. 展开更多
关键词 semicrystalline composite hole injection organic light-emitting diode
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Low Temperature DC Sputtering Deposition on Indium-Tin Oxide Film and Its Application to Inverted Top-emitting Organic Light-emitting Diodes 被引量:1
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作者 Hui LIN Junsheng YU Shuangling LOU Jun WANG Yadong JIANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第2期179-182,共4页
Indium tin oxide (ITO) ultrathin films were prepared on glass substrate by DC (direct current) magnetron sputtering technique with the assistance of H2O vapor to avoid potential surface damage. The film properties... Indium tin oxide (ITO) ultrathin films were prepared on glass substrate by DC (direct current) magnetron sputtering technique with the assistance of H2O vapor to avoid potential surface damage. The film properties were characterized by X-ray diffraction (XRD) technique, four-point probe method and spectrophotometer. The results show that the deposited ITO film with introduced H2O during sputtering process was almost amorphous. The average visible light transmission of 100 nm ITO film was around 85% and square resistivity was below 80 Ω/square. The film was used as the transparent anode to fabricate an inverted top-emitting organic light-emitting diodes (IT-OLEDs) with the structure of glass substrate/Alq3 (40 nm)/NPB (15 nm)/CuPc (x nm)/ITO anode (100 nm), where the film thickness of CuPc was optimized. It was found that the luminance of this IT-OLEDs was improved from 25 cd/m^2 to more than 527 cd/m^2 by increasing the thickness of CuPc, and luminance efficiency of 0.24 lm/W at 100 cd/m^2 was obtained, which indicated that the optimized thickness of CuPc layer was around 15 nm. 展开更多
关键词 Inverted top-emitting organic light-emitting diodes INDIUM-TIN-OXIDE Ultrathin film DC sputtering
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Black Photoresist for Patterning Pixel Define Layer of Organic Light Emitting Diode with Polyimide as Thermal Stabilizer 被引量:1
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作者 Genggongwo Shi Jin Woo Park Lee Soon Park 《Materials Sciences and Applications》 2018年第6期554-564,共11页
In order to improve the visibility for outside use of organic light emitting diodes (OLEDs), the polarized film and black matrix pattern have been used in the small and medium sized OLEDs;however, these cause problem ... In order to improve the visibility for outside use of organic light emitting diodes (OLEDs), the polarized film and black matrix pattern have been used in the small and medium sized OLEDs;however, these cause problem of reducing the emission efficiency of OLED. Changing the color of pixel define layer (PDL) from brown to black is an important point for improving the efficiency and visibility of OLEDs. In this work we studied the photoresist material containing black pigment and the photolithographic process for patterning of black PDL on OLEDs. The black PDL patterns made with our synthesized polyimides as thermal stabilizer were found to give high thermal stability over 300&deg;C. 展开更多
关键词 organic light emitting diode PIXEL Define LAYER BLACK PIXEL Define LAYER PHOTOLITHOGRAPHY
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Tetraalkyl-substituted zinc phthalocyanines used as anode buffer layers for organic light-emitting diodes 被引量:1
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作者 Qian Chen Songhe Yang +3 位作者 Lei Dong Siyuan Cai Jiaju Xu Zongxiang Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第1期417-423,共7页
Two soluble tetraalkyl-substituted zinc phthalocyanines(ZnPcs)for use as anode buffer layer materials in tris(8-hydroxyquinoline)aluminum(Alq3)-based organic light-emitting diodes(OLEDs)are presented in this work.The ... Two soluble tetraalkyl-substituted zinc phthalocyanines(ZnPcs)for use as anode buffer layer materials in tris(8-hydroxyquinoline)aluminum(Alq3)-based organic light-emitting diodes(OLEDs)are presented in this work.The holeblocking properties of these Zn Pc layers slowed the hole injection process into the Alq3 emissive layer greatly and thus reduced the production of unstable cationic Alq3(Alq3^+)species.This led to the enhanced brightness and efficiency when compared with the corresponding properties of OLEDs based on the popular poly-(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)buffer layer.Furthermore,because of the high thermal and chemical stabilities of these Zn Pcs,a nonaqueous film fabrication process was realized together with improved charge balance in the OLEDs and enhanced OLED lifetimes. 展开更多
关键词 organic light-emitting diode anode buffer layer metal phthalocyanine solution process
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Improved performance of organic light-emitting diodes with dual electron transporting layers 被引量:1
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作者 焦志强 吴晓明 +4 位作者 华玉林 穆雪 毕文涛 白娟娟 印寿根 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期448-450,共3页
In this study the performance of organic light-emitting diodes (OLEDs) are enhanced significantly, which is based on dual electron transporting layers (13phen/CuPc). By adjusting the thicknesses of Bphen and CuPc,... In this study the performance of organic light-emitting diodes (OLEDs) are enhanced significantly, which is based on dual electron transporting layers (13phen/CuPc). By adjusting the thicknesses of Bphen and CuPc, the maximal luminescence, the maximal current efficiency, and the maximal power efficiency of the device reach 17570 cd/m^2 at 11 V, and 5.39 cd/A and 3.39 lm/W at 3.37 mA/cm^2 respectively, which are enhanced approximately by 33.4%, 39.3%, and 68.9%, respectively, compared with those of the device using Bphen only for an electron transporting layer. These results may provide some valuable references for improving the electron injection and the transportation of OLED. 展开更多
关键词 organic light-emitting diodes dual electron transporting layers CUPC
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Enhanced light extraction of GaN-based light-emitting diodes with periodic textured SiO_2 on Al-doped ZnO transparent conductive layer 被引量:3
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作者 招瑜 范冰丰 +4 位作者 陈义廷 卓毅 庞洲骏 刘振 王钢 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期553-556,共4页
We report an effective enhancement in light extraction of Ga N-based light-emitting diodes(LEDs) with an Al-doped Zn O(AZO) transparent conductive layer by incorporating a top regular textured SiO2 layer. The 2 in... We report an effective enhancement in light extraction of Ga N-based light-emitting diodes(LEDs) with an Al-doped Zn O(AZO) transparent conductive layer by incorporating a top regular textured SiO2 layer. The 2 inch transparent throughpore anodic aluminum oxide(AAO) membrane was fabricated and used as the etching mask. The periodic pore with a pitch of about 410 nm was successfully transferred to the surface of the SiO2 layer without any etching damages to the AZO layer and the electrodes. The light output power was enhanced by 19% at 20 m A and 56% at 100 m A compared to that of the planar LEDs without a patterned surface. This approach offers a technique to fabricate a low-cost and large-area regular pattern on the LED chip for achieving enhanced light extraction without an obvious increase of the forward voltage. 展开更多
关键词 light-emitting diodes III–V material transparent conductive layer anodic aluminum oxide
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Controlled Growth of Large-Area Aligned Single-Crystalline Organic Nanoribbon Arrays for Transistors and Light-Emitting Diodes Driving 被引量:1
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作者 Wei Wang Liang Wang +4 位作者 Gaole Dai Wei Deng Xiujuan Zhang Jiansheng Jie Xiaohong Zhang 《Nano-Micro Letters》 SCIE EI CAS 2017年第4期193-203,共11页
Organic field-effect transistors(OFETs) based on organic micro-/nanocrystals have been widely reported with charge carrier mobility exceeding 1.0 cm^2V^(-1)s^(-1), demonstrating great potential for high-performance, l... Organic field-effect transistors(OFETs) based on organic micro-/nanocrystals have been widely reported with charge carrier mobility exceeding 1.0 cm^2V^(-1)s^(-1), demonstrating great potential for high-performance, low-cost organic electronic applications. However, fabrication of large-area organic micro-/nanocrystal arrays with consistent crystal growth direction has posed a significant technical challenge. Here, we describe a solution-processed dip-coating technique to grow large-area, aligned 9,10-bis(phenylethynyl) anthracene(BPEA) and 6,13-bis(triisopropylsilylethynyl) pentacene(TIPSPEN) single-crystalline nanoribbon arrays. The method is scalable to a 5 9 10 cm^2 wafer substrate, with around 60% of the wafer surface covered by aligned crystals. The quality of crystals can be easily controlled by tuning the dip-coating speed. Furthermore, OFETs based on well-aligned BPEA and TIPS-PEN single-crystalline nanoribbons were constructed.By optimizing channel lengths and using appropriate metallic electrodes, the BPEA and TIPS-PEN-based OFETs showed hole mobility exceeding 2.0 cm^2V^(-1)s^(-1)(average mobility 1.2 cm^2V^(-1)s^(-1)) and 3.0 cm^2V^(-1)s^(-1)(average mobility2.0 cm^2V^(-1)s^(-1)), respectively. They both have a high on/off ratio(I_(on)/I_(off))>10~9. The performance can well satisfy the requirements for light-emitting diodes driving. 展开更多
关键词 Large-area growth organic single-crystalline nanoribbon arrays organic field-effect transistors light-emitting diodes driving
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White Organic Light-emitting Diodes with A Sr_2SiO_4:Eu^(3+) Color Conversion Layer
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作者 Meiso Yokoyama 《发光学报》 EI CAS CSCD 北大核心 2013年第6期681-685,共5页
Abstract:Hybrid inorganic/organic white organic light emitting diodes(hybrid-WOLEDs)are fabricated by combi-ning the blue phosphorescent organic light emitting diodes(PHOLEDs)with red Sr2SiO4:Eu3+phosphor spin coateda... Abstract:Hybrid inorganic/organic white organic light emitting diodes(hybrid-WOLEDs)are fabricated by combi-ning the blue phosphorescent organic light emitting diodes(PHOLEDs)with red Sr2SiO4:Eu3+phosphor spin coatedas a color conversion layer(CCL)over the other side of glass substrate on the devices.The basic configuration of thePHOLEDs consists a host material,N,N'-dicarbazolyl-3,5-benzene(mCP)which doped with a blue phosphorescentiridium complexes iridium(Ⅲ)bis[(4,6-di-fluorophenyl)-pyridinato-N-C2'](FIrpic)to produce high efficient blueorganic light emitting diodes.The hybrid-WOLED shows maximum luminous efficiency of 22.1 cd/A,maximumpower efficiency of 11.26 lm/W,external quantum efficiency of 10.2%and CIE coordinates of(0.32,0.34).Mo-reover,the output spectra and CIE coordinates of the hybrid-WOLED have a small shift in different driving currentdensity,which demonstrate good color stability. 展开更多
关键词 white organic light emitting diodes (WOLEDs) COLOR conversion layer(CCL) SR2 Si04 EU COLOR stability
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