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Bi2WO6量子点(QDs)修饰Bi2MoO6-xF2x异质结的构筑及其催化活性增强机理 被引量:5
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作者 王丹军 申会东 +4 位作者 付梦溪 王婵 郭莉 杨晓 付峰 《无机化学学报》 SCIE CAS CSCD 北大核心 2018年第1期73-82,共10页
采用简单沉积-沉淀法合成了Bi_2WO_6@Bi_2MoO_(6-x)F_(2x)(BWO/BMO_(6-x)F_(2x))异质结,借助XRD、XPS、TEM、SEM、EDS、UV-Vis-DRS、PC和EIS等测试技术对其组成、形貌、光吸收特性和光电化学性能等进行系统表征,并以模型污染物罗丹明B(R... 采用简单沉积-沉淀法合成了Bi_2WO_6@Bi_2MoO_(6-x)F_(2x)(BWO/BMO_(6-x)F_(2x))异质结,借助XRD、XPS、TEM、SEM、EDS、UV-Vis-DRS、PC和EIS等测试技术对其组成、形貌、光吸收特性和光电化学性能等进行系统表征,并以模型污染物罗丹明B(Rh B)的光催化降解作为探针反应来评价Bi_2WO_6@Bi_2MoO_(6-x)F_(2x)异质结的光催化活性增强机制。形貌分析表明,所得Bi_2MoO_6微球由大量厚度为20~50 nm的纳米片组成;FE-SEM和HR-TEM分析表明,尺寸约为10 nm的Bi_2WO_6量子点均匀沉积在Bi_2MoO_(6-x)F_(2x)微球表面,形成新颖的Bi_2WO_6@Bi_2MoO_(6-x)F_(2x)异质结;与纯Bi_2MoO_6或者Bi_2WO_6相比,1∶1Bi_2WO_6@Bi_2MoO_(6-x)F_(2x)异质结表现出更好的光催化活性和光电流性质,其对RhB光催化降解的表观速率常数分别为纯BMO和BWO的6.4和11.6倍。PC和EIS图谱分析表明,Bi_2WO_6量子点表面沉积显著提高Bi_2MoO_(6-x)F_(2x)光生电子/空穴的分离效率和迁移速率;活性物种捕获实验证明了·O_2^-和h^+是主要的活性物种。根据实验结果,探讨了F-掺杂和Bi_2WO_6量子点之间的协同效应对Bi_2MoO_6的光催化活性的影响机制。 展开更多
关键词 沉积-沉淀法 量子点修饰 Bi2WO6/Bi2MoO6-xF2x异质结 光催化 协同效应
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CdTe@ZnS QDs-PDDA功能化石墨烯复合物的制备和表征 被引量:2
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作者 张纪梅 魏猛 祁世波 《天津工业大学学报》 CAS 北大核心 2015年第6期50-54,共5页
以巯基丙酸(MPA)为稳定剂,在水相中制备高荧光强度的Cd Te量子点(Cd Te QDs),再以硫化钠和硫酸锌分别为硫源和锌源对其进行包裹得到Cd Te@Zn S量子点,研究了回流时间和p H值对量子点荧光强度的影响.采用改进的Hummers法制备了氧化石墨,... 以巯基丙酸(MPA)为稳定剂,在水相中制备高荧光强度的Cd Te量子点(Cd Te QDs),再以硫化钠和硫酸锌分别为硫源和锌源对其进行包裹得到Cd Te@Zn S量子点,研究了回流时间和p H值对量子点荧光强度的影响.采用改进的Hummers法制备了氧化石墨,再以水合肼作为还原剂,加入聚二烯二甲基氯化铵(PDDA),制得PDDA功能化的石墨烯.利用静电力将量子点和功能化的石墨烯连接在一起得到Cd Te@Zn S QDsPDDA功能化石墨烯复合材料.采用紫外光谱、荧光光谱、透射电镜(TEM)、扫描电镜(SEM)和X射线衍射(XRD)对复合材料的结构进行了表征.结果表明:在p H=9、回流时间为140 min条件下,Cd Te@Zn S量子点的荧光强度最大;Cd Te@Zn S量子点均匀负载在PDDA功能化石墨烯的表面. 展开更多
关键词 量子点 石墨烯 荧光 纳米复合材料
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PREPARATION AND CHARACTERIZATION OF WATER-SOLUBLE NEAR-INFRARED EMITTING PbS QUANTUM DOTS
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作者 曹洁 李杉 +1 位作者 邓大伟 顾月清 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2010年第1期81-87,共7页
A new facile method for preparing water-soluble near-infrared (NIR)-emitting PbS quantum dots (QDs) is proposed by using N-acetyl-L-cysteine (NAC, a derivate of L-cysteine) as its stabilizer. The influence of th... A new facile method for preparing water-soluble near-infrared (NIR)-emitting PbS quantum dots (QDs) is proposed by using N-acetyl-L-cysteine (NAC, a derivate of L-cysteine) as its stabilizer. The influence of the precursor Pb/S molar ratio, the Pb/NAC molar ratio, and the pH of original solution on optical properties is explored. Results show that aqueous PbS QDs with strong NIR fluorescence can be prepared and their photoluminescence emission peaks can be tuned from 895 nm to 970 nm. Studies indicate that such aqueous QDs have a potential application in biomedical imaging, especially in noninvasive in vivo fluorescence imaging. In addition, the resulting PbS QDs are further characterized by a transmission electron microscopy and X-ray diffraction analysis. 展开更多
关键词 semiconductor quantum dots (qds biomedical imaging N-acetyl-L-cystelne(NAC) NEAR-INFRARED
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QDs标记免疫调节肽及其与T细胞作用的表征 被引量:5
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作者 王丽凤 王丽萍 +2 位作者 陈洁 房学迅 李惟 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2006年第2期271-273,共3页
Semiconductor quantum dots(QDs) were used for labeling many biomacromolecules and small molecules,but it remains a challenge to couple it with short active peptides without any limitation,which play critical roles in ... Semiconductor quantum dots(QDs) were used for labeling many biomacromolecules and small molecules,but it remains a challenge to couple it with short active peptides without any limitation,which play critical roles in many physiological processes.Several coupling methods known about QDs and short peptides have some limitations.In this research,we report a method for the synthesis of QDs labeled peptides to be appropriate to any short peptide.The QDs(CdTe)-labeled short peptides were verified and characterized by RP-HPLC.The result shows that the surface of the T cell treated with QDs-TP5 emits yellow fluoresence.These results indicate that QDs-TP5 tends to aggregate on the surface of T cells.They were applied to monitoring the specific binding between the immune peptides and T cell surface receptors.The binding and the resultant fluorescence were observed and monitored by fluorescence microscope in vitro.The QDs-labeled immune peptides provide a powerful method for studying the immune modulating activity of TP5 in vivo. 展开更多
关键词 半导体量子点(qds) 荧光标记 免疫调节肽
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Synthesis of CdSe quantum dots via paraffin liquid and oleic acid 被引量:2
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作者 Yu-feng LIAO Wen-jiang LI 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第1期133-136,共4页
This paper reported an efficient and rapid method to produce highly monodispersed CdSe quantum dots (QDs), in which the traditional trioctylphosphine oxide (TOPO) was replaced by paraffin liquid as solvent and oleic a... This paper reported an efficient and rapid method to produce highly monodispersed CdSe quantum dots (QDs), in which the traditional trioctylphosphine oxide (TOPO) was replaced by paraffin liquid as solvent and oleic acid as the reacting media. The experimental conditions and the properties of QDs had been studied in detail. The resulting samples were confirmed of uniform size distribution with transmission electronic microscopy (TEM), while UV-vis absorption and photoluminescence (PL) spectra clearly indicated that such synthesized QDs had good fluorescence properties. 展开更多
关键词 CDSE Synthesis Quantum dots (qds FLUORESCENCE
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Cytotoxicity and DNA Damage Effect of TGA-capped CdTe Quantum Dots 被引量:1
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作者 LI Yan-bo ZHANG Hai-xia +6 位作者 GUO Cai-xia HU Gui-qin DU Hai-ying JIN Ming-hua HUANG Pei-li SUN Zhi-wei YANG Wen-sheng 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第2期276-281,共6页
The cytotoxicity and DNA damage caused by thioglycolic acid(TGA)-capped cadmium telluride(CdTe) quantum dots(QDs) to hepatocyte line HL-7702 were investigated.Cell viability was measured by 3-(4,5-dimethylthiaz... The cytotoxicity and DNA damage caused by thioglycolic acid(TGA)-capped cadmium telluride(CdTe) quantum dots(QDs) to hepatocyte line HL-7702 were investigated.Cell viability was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) assay;DNA damage was detected by single cell gel electrophoresis(SCGE);the change of cell cycle progression was examined by propidium iodide(PI)-flow cytometry(FCM);apoptosis was measured by acridine orange/ethidium bromide(AO/EB) assay and Annexin V-FITC/PI-FCM(FITC:fluorescein isothiocyanate).The results show that the cytotoxicity induced by CdTe QDs was increased in a dose-dependent and time-dependent manner;after exposure to QDs for 24 h,as the exposure dose increased,the rate of DNA damage was significantly increased(P0.05),and the degree of DNA damage was elevated.As the dose of CdTe QDs increased,the percentage of G 0 /G 1 phase cells was significantly decreased(P0.001),while the percenttages of S and G 2 /M phases cells were significantly increased(P0.001).In AO/EB assay,apoptotic cells could be observed under a fluorescence microscope,and apoptotic rate was increased as exposure dose increased.In Annexin V-FITC/PI-FCM assay,the apoptotic rates of CdTe QDs treated groups were significantly increased compared with that of control group(P0.05).Our studies indicate that CdTe QDs could influence cell viability,and induce DNA damage,the S and G2 /M phases arrest and apoptosis of HL-7702. 展开更多
关键词 Apoptosis CdTe quantum dotqd Cell cycle Cell viability DNA damage
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Molecularly Imprinted Polymer Based on GO-QDs as Enhanced Fluorescent Nanoscale Device for Specific Recognition of Target Protein 被引量:1
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作者 DING Zhao-qiang GONG Xiao +3 位作者 TAO Lei QUAN Jing NIE Hua-li ZHU Li-min 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期603-608,共6页
In this work the enhanced molecularly imprinted optosensing material based on graphene oxide-quantum dots ( GO- QDs) was synthesized for highly selective and sensitive specific recognition of the target protein, bov... In this work the enhanced molecularly imprinted optosensing material based on graphene oxide-quantum dots ( GO- QDs) was synthesized for highly selective and sensitive specific recognition of the target protein, bovine serum albumin (BSA). Here, GO was introduced to enhance the efficiency of mass-transfer in recognition of target protein. Molecularly imprinted polymer coated GO-QDs using BSA as template (BMIP-coated GO-QDs ) exhibited a fast mass-transfer speed, which could be ascribed to the high volume of efficient surface area and high target recognition efficiency of the synthesized nanoscale device. Under optimal conditions, it was found that the BSA as target protein could remarkably quench the relative fluorescence intensity of BMIP- coated GO-QDs linearly in a concentration-dependent manner that was best described by a Stern-Volmer equation. The Ksv (Stern- Volmer constant) for template BSA was much higher than bovine hemoglobin (BHb) and lysozyme (Lyz), implying a highly selective recognition ability of the BMIP-coated GO-QDs to BSA. This enhanced fluorescent nanoscale device may provide opportunities to develop a system that is efficient and effective and has potential in the design of highly effective fluorescent receptor for recognition of target protein in Droteomics studies. 展开更多
关键词 molecularly imprinted polymer (MIP) graphene oxide(GO) quantum dots (qds) protein: FLUORESCENT NANOSCALE DEVICE
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Fabrication of Silicon Carbide Quantum Dots via Chemical-Etching Approach and Fluorescent Imaging for Living Cells 被引量:2
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作者 Yuepeng Song Dongsheng Gao +7 位作者 Hyoung Seop Kim Cuiqin Qu Jie Kang Yanmin Zhu Ziping Liu Jing Guo Lingfeng Xu Chong Soo Lee 《Materials Sciences and Applications》 2014年第4期177-182,共6页
A simple chemical-etching approach is used to prepare the silicon carbide quantum dots (QDs). The raw materials of silicon carbide (SiC) with homogeneous nanoparticles fabricated via self-propagating combustion synthe... A simple chemical-etching approach is used to prepare the silicon carbide quantum dots (QDs). The raw materials of silicon carbide (SiC) with homogeneous nanoparticles fabricated via self-propagating combustion synthesis are corroded in mixture etchants of nitric and hydrofluoric acid. After sonication and chromatography in the ultra-gravity field for the etched products, aqueous solution with QDs can be obtained. The microstructure evolution of raw particles and optical properties of QDs were measured. Different organophilic groups on the surface like carboxyl, oxygroup, and hyfroxy were produced in the process of etching. Fluorescent labeling and imaging for living cells of Aureobasidium pulluans were investigated. The results indicated that SiC QDs were not cytotoxic and could stably label due to the conjugation between organophilic groups of QDs and specific protein of cells, it can be utilized for fluorescent imaging and tracking cells with in vivo and long-term-distance. Moreover, mechanism and specificity of mark were also analyzed. 展开更多
关键词 Silicon CARBIDE Quantum dots (qds) FLUORESCENT Imaging Living Cells AUREOBASIDIUM pulluans
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CdSQDs/Bi_(2)O_(3)复合材料的制备及可见光催化性能研究 被引量:1
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作者 廖润华 任婉璐 +1 位作者 肖林锋 周英棠 《中国陶瓷》 CAS CSCD 北大核心 2022年第1期29-35,共7页
为探索高效利用可见光能源,合成新型光催化剂并应用于污水处理。研究选用原位油浴法将硫化镉量子点(CdSQDs)修饰于单晶相氧化铋表面,形成了一种新型的高性能催化剂(CdSQDs/Bi_(2)O_(3)),并通过XRD、XPS、SEM、TEM、BET、UV-Vis DRS、PL... 为探索高效利用可见光能源,合成新型光催化剂并应用于污水处理。研究选用原位油浴法将硫化镉量子点(CdSQDs)修饰于单晶相氧化铋表面,形成了一种新型的高性能催化剂(CdSQDs/Bi_(2)O_(3)),并通过XRD、XPS、SEM、TEM、BET、UV-Vis DRS、PL等技术对其进行了相关表征分析。结果表明:硫化镉量子点成功负载于氧化铋表面,可以增加催化剂的比表面积,由5.1199 m^(2)/g提高至51.3322 m^(2)/g,且减小了催化剂的禁带宽度,由2.50 ev缩小为2.17 ev,从而增强了光催化性能。降解实验结果表明:当负载量达到10%时,降解效果最佳,其降解效率达到98.8%,且具有良好的稳定性。研究结果可为探究高效复合光催化剂在污水处理的应用提供参考。 展开更多
关键词 硫化镉量子点(CdS qds) 污水处理 光催化 原位油浴法
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Recent advances in quantum dot catalysts for hydrogen evolution:Synthesis,characterization,and photocatalytic application 被引量:4
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作者 Haiwei Su Weikang Wang +5 位作者 Run Shi Hua Tang Lijuan Sun Lele Wang Qinqin Liu Tierui Zhang 《Carbon Energy》 SCIE EI CAS CSCD 2023年第9期1-37,共37页
Photocatalytic water splitting is beneficial for the effective mitigation of global energy and environmental crises.Owing to multi-exciton generation,impressive light harvesting,and excellent photochemical properties,... Photocatalytic water splitting is beneficial for the effective mitigation of global energy and environmental crises.Owing to multi-exciton generation,impressive light harvesting,and excellent photochemical properties,the quantum dot(QD)-based catalysts reveal a considerable potential in photocatalytic hydrogen(H_(2))production compared with bulk competitors.In this review,we summarize the recent advances in QDs for photocatalytic H_(2) production by enumerating different synthetic and characterization strategies for QDs.Various QDs-based photocatalysts are introduced and summarized in categories,and the role of different QDs in varied systems,as well as the mechanism and key factors that enhance the photocatalytic H_(2) generation performance,is discussed.Finally,conclusions and future perspectives in the exploration of highly efficient QDs-based photocatalysts for innovative applications are highlighted. 展开更多
关键词 CHARACTERIZATION functions of qds hydrogen evolution reaction quantum dots SYNTHESIS
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Preparation of Electrospun CdSe-Quantum-Dots-Doped Porous Films
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作者 GAO Bing SHEN Chao +5 位作者 YUAN Shuang-long ZHANG Jian-guang YANG Yun-xia MO Xiu-mei LI Hai-yan CHEN Guo-rong 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期609-616,共8页
Electrospun porous films doped with the green-synthesized CdSe quantum dots were synthesized. Glycerol was chosen to prepare the quantum dots ( QDs), with the highest quantum yield of 78.28%. Polycaprolactone (PCL... Electrospun porous films doped with the green-synthesized CdSe quantum dots were synthesized. Glycerol was chosen to prepare the quantum dots ( QDs), with the highest quantum yield of 78.28%. Polycaprolactone (PCL) was electrospun with CdSe QDs to avoid the QDs' toxicity and improve the QDs' cytocompatibility. The electrospun QDs-doped films preserve the original QDs' fluorescence. Pores can be detected from the SEM of the films, predicting the possibility of loading drugs in the cancer therapy. The cell proliferation assay shows excellent cytocompatibility of the eletrospun CdSe-QDs-doped films. The present eletrospun CdSe- QDs-doped porous films are cytocompatibale, highly-fluorescent and ootential to load drugs in cancer therapy. 展开更多
关键词 CdSe-quantum dots (qds ) ELECTROSPUN films POLYCAPROLACTONE (PCL) photoluminescence (PL) CYTOCOMPATIBILITY cell proliferation assay
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PbSe quantum dots for an evanescent wave excited fiber amplifier
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作者 庞拂飞 王婧 +2 位作者 曾祥龙 陈振宜 王廷云 《Journal of Shanghai University(English Edition)》 CAS 2011年第2期119-122,共4页
A novel quantum dots (QDs) optical fiber amplifier was proposed and demonstrated. It was fabricated by dipcoating the PbSe QDs doped sol onto the taper region of fiber coupler. The PbSe QDs was synthesized according... A novel quantum dots (QDs) optical fiber amplifier was proposed and demonstrated. It was fabricated by dipcoating the PbSe QDs doped sol onto the taper region of fiber coupler. The PbSe QDs was synthesized according to a colloidal method. A lower refractive index sol was also synthesized as the host of PbSe QDs. A standard single mode fiber was used to make the fusion tapered fiber coupler which had double input and output ports. With the simple structure, a signal and a pump can be injected into the amplifier and excite the PbSe QDs through evanescent wave. The experimental results indicated that the amplified light wave was observed at 1 550 nm wavelength with 980 nm .wavelength laser diode as pump. 展开更多
关键词 PbSe quantum dots (qds SOL-GEL fiber amplifier
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Novel Hybrid SiO2/ZnS Coated CdTe/CdS Quantum Dots and Their Bioapplications
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作者 刘琳 丁兆强 +3 位作者 杨慧琴 权静 朱利民 聂华丽 《Journal of Donghua University(English Edition)》 EI CAS 2017年第1期131-136,共6页
Novel CdTe/CdS quantum dots(QDs)coated with a hybrid of SiO_2 and ZnS were fabricated through a simple two-step approach.The hybrid SiO_2/ZnS coated CdTe/CdS quantum dots was characterized by transmission electron mic... Novel CdTe/CdS quantum dots(QDs)coated with a hybrid of SiO_2 and ZnS were fabricated through a simple two-step approach.The hybrid SiO_2/ZnS coated CdTe/CdS quantum dots was characterized by transmission electron microscopy(TEM),UV and fluorescence spectrometer.Results indicated that the core-shell structure gave the QDs outstanding photoluminescence properties,includinganarrowphotoluminescencespectrum,high photoluminescence(PL)quantum yield and long emission lifetime(average PL lifetime of increased from 26.4 ns to 49.1 ns).Cellular studies showed the QDs had good cytocompatibility with Hela cells as determined by the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide(MTT)assay after coating SiO_2/ZnS,and also proved the feasibility of using the hybrid SiO_2/ZnS coated QDs as optical probes for in vitro cell imaging.The synthesis method of QDs is highly promising for the production of robust and functional optical probes for bio-imaging and sensing applications. 展开更多
关键词 quantum dots(qds) CdTe/CdS nanocrystals hybrid nanostructures optical probes BIO-IMAGING
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Stability and luminescence properties of CsPbBr_(3)/CdSe/Al core-shell quantum dots
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作者 Heng Yao Anjiang Lu +2 位作者 Zhongchen Bai Jinguo Jiang Shuijie Qin 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第4期525-533,共9页
To improve the stability and luminescence properties of CsPbBr_(3)QDs,we proposed a new core-shell structure for CsPbBr_(3)/CdSe/Al quantum dots(QDs).By using a simple method of ion layer adsorption and a reaction met... To improve the stability and luminescence properties of CsPbBr_(3)QDs,we proposed a new core-shell structure for CsPbBr_(3)/CdSe/Al quantum dots(QDs).By using a simple method of ion layer adsorption and a reaction method,CdSe and A1 were respectively packaged on the surface of CsPbBr_(3)QDs to form the core-shell CsPbBr_(3)/CdSe/Al QDs.After one week in a natural environment,the photoluminescence quantum yields of CsPbBr_(3)/CdSe/Al QDs were greater than 80%,and the PL intensity remained at 71%of the original intensity.Furthermore,the CsPbBr_(3)/CdSe/Al QDs were used as green emitters for white light-emitting diodes(LEDs),with the LEDs spectrum covering 129%of the national television system committee(NTSC)standard color gamut.The core-shell structure of QDs can effectively improve the stability of CsPbBr_(3)QDs,which has promising prospects in optoelectronic devices. 展开更多
关键词 luminescence properties STABILITY CsPbBr_(3)/CdSe/Al quantum dots(qds) CsPbBr_(3)qds
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Single- and Few-Electron States in Deformed Topological Insulator Quantum Dots
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作者 李健 张东 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第4期101-104,共4页
We theoretically investigate the single- and few-electron states in deformed HgTe quantum dots (QDs) with an inverted band structure using the full configuration interaction method. For the circular and deformed QD,... We theoretically investigate the single- and few-electron states in deformed HgTe quantum dots (QDs) with an inverted band structure using the full configuration interaction method. For the circular and deformed QD, it is found that the energy of edge states is robust against the shape from the circular QD in various elliptic ones. For the few electron states, electrons will firstly fill the edge states localized at the short axis, then the states localized at the long axis of the QD before filling the bulk states. The filling of the edge states can be controlled by tuning the dot size or the deformation of the geometry of the HgTe QD, respectively. 展开更多
关键词 qds SINGLE and Few-Electron States in Deformed Topological Insulator Quantum dots
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Anti-Reflection Characteristics of Si Nanowires for Enhanced Photoluminescence from CdTe/CdS Quantum Dots
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作者 Hong-Yu Wang Dan Shan Ling Xu 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期91-94,共4页
CdTe/CdS quantum dots(QDs) are fabricated on Si nanowires(NWs) substrates with and without Au nanoparticles(NPs). The formation of Au NPs on Si NWs can be certified as shown in scanning electron microscopy image... CdTe/CdS quantum dots(QDs) are fabricated on Si nanowires(NWs) substrates with and without Au nanoparticles(NPs). The formation of Au NPs on Si NWs can be certified as shown in scanning electron microscopy images. The optical properties of samples are also investigated. It is interesting to find that the photoluminescence(PL) intensity of Cd Te/Cd S QD films on Si nanowire substrates with Au NPs is significantly increased,which can reach 8-fold higher than that of samples on planar Si without Au NPs. The results of finite-difference time-domain simulation indicate that Au NPs induce stronger localization of electric field and then boost the PL intensity of QDs nearby. Furthermore, the time-resolved luminescence decay curve shows the PL lifetime, which is about 5.5 ns at the emission peaks of QD films on planar, increasing from 1.8 ns of QD films on Si NWs to4.7 ns after introducing Au NPs into Si NWs. 展开更多
关键词 Si qds Anti-Reflection Characteristics of Si Nanowires for Enhanced Photoluminescence from CdTe/CdS Quantum dots CdS
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Single-Photon Emission from GaAs Quantum Dots Embedded in Nanowires
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作者 杨爽 窦秀明 +4 位作者 喻颖 倪海桥 牛智川 江德生 孙宝权 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第7期198-201,共4页
A highly efficient single-photon source based on a semiconductor quantum dot (QD) is a promising candidate in quantum information processing. We report a single-photon source based on self-assembled GaAs QDs in nano... A highly efficient single-photon source based on a semiconductor quantum dot (QD) is a promising candidate in quantum information processing. We report a single-photon source based on self-assembled GaAs QDs in nanowires with an extraction efficiency of 14%. The second-order correlation function g(2) (0) at saturate excitation power is estimated to be 0.28. The measured polarization of QD emission depends on the geometric relations between the directions of PL collection and the long axis of nanowires. 展开更多
关键词 Single-Photon Emission from GaAs Quantum dots Embedded in Nanowires qds
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Room-Temperature Organic Negative Differential Resistance Device Using CdSe Quantum Dots as the ITO Modification Layer
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作者 焦博 姚丽娟 +3 位作者 吴春芳 董化 侯洵 吴朝新 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第11期122-126,共5页
Room-temperature negative differential resistance (NDR) has been observed in different types of organic materials. However, detailed study on the influence of the organic material on NDR performance is still scarce.... Room-temperature negative differential resistance (NDR) has been observed in different types of organic materials. However, detailed study on the influence of the organic material on NDR performance is still scarce. In this work, room-temperature NDR & observed when CdSe quantum dot (QD) modified ITO is used as the electrode. Furthermore, material dependence of the NDR performance is observed by selecting materials with different charge transporting properties as the active layer, respectively. A peak-to-valley current ratio up to 9 is observed. It is demonstrated that the injection barrier between ITO and the organic active layer plays a decisive role for the device NDR performance. The influence of the aggregation state of CdSe QDs on the NDR performance is also studied, which indicates that the NDR is caused by the resonant tunneling process in the ITO/CdSe QD/organic active layer structure. 展开更多
关键词 Room-Temperature Organic Negative Differential Resistance Device Using CdSe Quantum dots as the ITO Modification Layer qds NDR ITO
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Development of Colloidal Quantum Dots based Light-Emitting Diodes
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作者 He Shao-Jian Lin Jun Tan Zhan-Ao 《物理学进展》 CSCD 北大核心 2013年第1期24-41,共18页
关键词 物理学 进展 征订 启事 征稿
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OLED和QD-LCD技术的显示质量与视疲劳影响
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作者 郭正阳 刘超屹 +2 位作者 赵晓莺 安夏 潘长勇 《电视技术》 2023年第8期140-146,共7页
近年来,随着高清显示技术的不断发展,各种显示终端产品被广泛应用,视疲劳发病率显著上升。有机发光二极管(Organic Light Emitting Diode,OLED)和量子点液晶(Quantum Dot Liquid Crystal Display,QD-LCD)是两种各具优势的显示技术。为... 近年来,随着高清显示技术的不断发展,各种显示终端产品被广泛应用,视疲劳发病率显著上升。有机发光二极管(Organic Light Emitting Diode,OLED)和量子点液晶(Quantum Dot Liquid Crystal Display,QD-LCD)是两种各具优势的显示技术。为研究两种显示技术的显示质量及其对视疲劳的影响,采用主客观评价相结合的方式,选取41名被试,利用被试主观评分对比采用OLED技术和QD-LCD技术的显示终端在不同观看任务下的显示质量与对视疲劳的影响。测试结果显示,受试者中的青年人与近视患者观看LCD电视后的眼疲劳感较观看OLED电视强,其余测试项结果无显著差异。 展开更多
关键词 有机发光二极管(OLED) 量子点液晶(qd-LCD) 显示质量 视疲劳 主观评价
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