An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn...An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.展开更多
Iridium(Ⅲ)complexes with 2−phenylpyridine(ppy)have been demonstrated as a type of promising phosphorescence dopant in emitting layers of organic light emitting diodes(OLEDs).In most iridium(III)complexes,there exist ...Iridium(Ⅲ)complexes with 2−phenylpyridine(ppy)have been demonstrated as a type of promising phosphorescence dopant in emitting layers of organic light emitting diodes(OLEDs).In most iridium(III)complexes,there exist the strong spin−orbit coupling betweenπ−orbitals of cyclometalated ligands and 5d orbitals of the centric iridium.We study a novel iridium(Ⅲ)complex(ppy)2Ir(4−TfmBTZ)with ppy as cyclometalated ligands and 2-(4-trifluoromethyl-2-hydroxylphenyl)benzothiazole(4-TfmBTZ)as an ancillary ligand using the Gaussian 03 program.The geometries,electronic structures and spectroscopic properties of this iridium(Ⅲ)complex are investigated by density functional theory(DFT)and time−dependent density functional theory(TD-DFT).The results show that the spin-orbit coupling occurs not only between ppy and iridium atom but also between 4-TfmBTZ and iridium atom in this complex.The highest occupied molecular orbital is dominantly localized on the Ir atom and 4-TfmBTZ ligand,while the lowest unoccupied molecular orbital on 4-TfmBTZ ligand.The triplet lowest-lying transition is attributed to the Ir-to-4-TfmBTZ charge-transfer(3MLCT)transition while the sub−low-lying transitions are assigned to the 3MLCT transitions of Ir(ppy)2.The nature of the lowest unoccupied orbital changes from ppy−localized to 4-TfmBTZ-localized and reveals that phosphorescent color of Ir(Ⅲ)complex can be controlled by the ancillary ligand and substituent.展开更多
有机太阳能电池(Polymer Solar Cell,PSC)由于具有环保低能耗、轻量低成本、柔性、可溶液加工和大面积印刷制备的综合性优势而受到广泛关注。活性层是PSC最重要的组成部分,其形貌的调控和优化决定了器件最终的性能,因此有必要对活性层...有机太阳能电池(Polymer Solar Cell,PSC)由于具有环保低能耗、轻量低成本、柔性、可溶液加工和大面积印刷制备的综合性优势而受到广泛关注。活性层是PSC最重要的组成部分,其形貌的调控和优化决定了器件最终的性能,因此有必要对活性层优化工艺进行系统整理和分析。对活性层后处理工艺在PSC中应用的最新研究进展进行了综述,包括热退火、溶剂蒸气退火、热退火与溶剂蒸气退火的组合、添加辅助层和极性溶剂辅助后处理等工艺,并就其对器件性能改善的原因和对活性层形貌优化的机理进行了分析和总结,为PSC性能优化研究和产业化发展提供了理论依据。展开更多
基金the National Natural Science Founda- tion of China (No. 20671068 and 20471041)
文摘An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.
基金by the National Natural Scientific Foundation of China under Grant Nos 60976018 and 21071108Key Program of Science and Technology of Ministry of Education(207015)+1 种基金Program for Changjiang Scholar and Innovative Research Team in University(IRT0972)Shanxi Natural Scientific Foundation(2008011008).
文摘Iridium(Ⅲ)complexes with 2−phenylpyridine(ppy)have been demonstrated as a type of promising phosphorescence dopant in emitting layers of organic light emitting diodes(OLEDs).In most iridium(III)complexes,there exist the strong spin−orbit coupling betweenπ−orbitals of cyclometalated ligands and 5d orbitals of the centric iridium.We study a novel iridium(Ⅲ)complex(ppy)2Ir(4−TfmBTZ)with ppy as cyclometalated ligands and 2-(4-trifluoromethyl-2-hydroxylphenyl)benzothiazole(4-TfmBTZ)as an ancillary ligand using the Gaussian 03 program.The geometries,electronic structures and spectroscopic properties of this iridium(Ⅲ)complex are investigated by density functional theory(DFT)and time−dependent density functional theory(TD-DFT).The results show that the spin-orbit coupling occurs not only between ppy and iridium atom but also between 4-TfmBTZ and iridium atom in this complex.The highest occupied molecular orbital is dominantly localized on the Ir atom and 4-TfmBTZ ligand,while the lowest unoccupied molecular orbital on 4-TfmBTZ ligand.The triplet lowest-lying transition is attributed to the Ir-to-4-TfmBTZ charge-transfer(3MLCT)transition while the sub−low-lying transitions are assigned to the 3MLCT transitions of Ir(ppy)2.The nature of the lowest unoccupied orbital changes from ppy−localized to 4-TfmBTZ-localized and reveals that phosphorescent color of Ir(Ⅲ)complex can be controlled by the ancillary ligand and substituent.
文摘有机太阳能电池(Polymer Solar Cell,PSC)由于具有环保低能耗、轻量低成本、柔性、可溶液加工和大面积印刷制备的综合性优势而受到广泛关注。活性层是PSC最重要的组成部分,其形貌的调控和优化决定了器件最终的性能,因此有必要对活性层优化工艺进行系统整理和分析。对活性层后处理工艺在PSC中应用的最新研究进展进行了综述,包括热退火、溶剂蒸气退火、热退火与溶剂蒸气退火的组合、添加辅助层和极性溶剂辅助后处理等工艺,并就其对器件性能改善的原因和对活性层形貌优化的机理进行了分析和总结,为PSC性能优化研究和产业化发展提供了理论依据。
