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热处理对MEH-PPV有机电致发光性能的影响 被引量:1
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作者 王奕 牛霞 +1 位作者 李娟 罗经国 《光电子.激光》 EI CAS CSCD 北大核心 2002年第6期563-566,共4页
以 MEH- PPV为发光层的单层聚合物有机发光二极管 (OL ED)器件在不同条件下进行真空热处理 ,并用金相显微镜观察器件在 12 V电压下工作的阴极表面形貌。与未经处理的器件相比 ,处理后的器件阴极表面的气泡及黑斑明显减少 ;器件的最大相... 以 MEH- PPV为发光层的单层聚合物有机发光二极管 (OL ED)器件在不同条件下进行真空热处理 ,并用金相显微镜观察器件在 12 V电压下工作的阴极表面形貌。与未经处理的器件相比 ,处理后的器件阴极表面的气泡及黑斑明显减少 ;器件的最大相对发光强度提高了一个数量级 ;启亮电压降低了 2 .0V;半寿命提高了 12 .7倍。初步分析表明 ,其主要原因在于 ,一方面有效地减少了器件在工作过程中由于焦耳热产生的有害气体 ,从而减少了阴极表面气泡及黑斑的出现 ;另一方面 ,热处理方法也增强了有机发光层与阴极接触界面的结合力 ,提高电子的注入能力。 展开更多
关键词 有机电致发光性能 可溶性聚对苯乙炔 热处理 黑斑 界面 有机发光二极管器件 气泡 焦耳热
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Synthesis and optophysical properties of blue-emitting iridium (Ⅲ) complex bearing oxadiazole-based picolinic acid derivative 被引量:2
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作者 文忠林 胡峥勇 +4 位作者 刘煜 肖方亮 马小云 朱美香 朱卫国 《Journal of Central South University》 SCIE EI CAS 2009年第3期380-384,共5页
An iridium (Ⅲ) bis[(4,6-difluorophenyl)pyridinato-N, C^2][6-(6'-(4"-( 5"-phenyl- 1", 3", 4"-oxadiazole-2"-yl) phenoxy) hexyloxy picolinate) was synthesized and characterized by IH NMR and elementary ... An iridium (Ⅲ) bis[(4,6-difluorophenyl)pyridinato-N, C^2][6-(6'-(4"-( 5"-phenyl- 1", 3", 4"-oxadiazole-2"-yl) phenoxy) hexyloxy picolinate) was synthesized and characterized by IH NMR and elementary analysis in order to study the effect of ancillary ligand of the oxadiazole-based picolinic acid derivative on optophysical properties of its iridium complex, and further to obtain an iridium complex with highly-efficient blue emission. The thermal stability, UV absorption and photoluminescent properties of this iridium complex were investigated. Compared with iridium (Ⅲ) bis[(4,6-difluorophenyl)pyridinato-N, C^2](picolinate) reported as a highly-efficient blue electroluminescent material, this iridium complex bearing an oxadiazole-based picolinic acid derivative presents higher thermal stability, more intense UV absorption at 291 nm and similar photoluminescent spectrum peaked at 469 nm. This indicates that tuning ancillary ligand of picolinic acid with an oxadiazole unit can improve the optophysical properties of its iridium complex. 展开更多
关键词 iridium complex 1 3 4-oxadiazole SYNTHESIS optophysical properties
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Effect of Al:Ag alloy cathode on the performance of transparent organic light-emitting devices
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作者 刘晋红 张方辉 《Optoelectronics Letters》 EI 2017年第3期175-178,共4页
Transparent organic light-emitting devices(TOLEDs) based on a stacked alloy cathode of LiF/Al:Ag are investigated. The devices have a structure of indium-tin-oxide(ITO)/4,4′,4′′-Tris[2-naphthyl(phenyl)amino]triphen... Transparent organic light-emitting devices(TOLEDs) based on a stacked alloy cathode of LiF/Al:Ag are investigated. The devices have a structure of indium-tin-oxide(ITO)/4,4′,4′′-Tris[2-naphthyl(phenyl)amino]triphenylamine(2T-NATA)(25 nm)/N,N'-Di-[(1-naphthyl)-N,N'-diphenyl]-1,1'-biphenyl-4,4'-diamine(NPB)(40 nm)/tris-(8-hydroxyquinoline) aluminum(Al_(q_3))(50 nm)/LiF(1 nm)/Al:Ag(1:3)(x), where the thicknesses of cathode metal layers(Al:Ag) are adjusted, respectively, from 70 nm to 100 nm. In the experiment, it is found that the Li F(1 nm)/Al:Ag(1:3)(75 nm) has good electron injection efficiency. Compared with an Al-only cathode, the turn-on voltage is lowered. At the voltage of 10 V, the luminances for bottom emission from ITO anode side and top emission from metal cathode side are 2 459 cd/m^2 and 1 729 cd/m^2, respectively. Thanks to electron injection enhancement by using Al:Ag cathode, we can obtain a better energy level matching between the cathode and the organic layer, thus the devices have lower turn-on voltage and higher luminance. The total transmittance of the devices can achieve about 40% at the wavelength of 550 nm. 展开更多
关键词 cathode naphthyl biphenyl diphenyl anode indium diamine transparent luminous transmittance
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Effects of transparent MPTMS/Ag/MoO_3 structure as anode on the performance of green organic light-emitting diodes
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作者 胡俊涛 邓亚飞 +1 位作者 梅文娟 杨劲松 《Optoelectronics Letters》 EI 2015年第5期333-337,共5页
A transparent 3-mercaptopropyl trimethoxysilane(MPTMS)/Ag/MoO3 composite anode is introduced to fabricate green organic light-emitting diodes(OLEDs). Effects of the composite anode on brightness and operating voltage ... A transparent 3-mercaptopropyl trimethoxysilane(MPTMS)/Ag/MoO3 composite anode is introduced to fabricate green organic light-emitting diodes(OLEDs). Effects of the composite anode on brightness and operating voltage of OLEDs are researched. By optimizing the thickness of each layer of the MPTMS/Ag/MoO3 structure, the transmittance of MPTMS/Ag(8 nm)/Mo O3(30 nm) reaches over 75% at about 520 nm. The sheet resistance is 3.78 ?/□, corresponding to this MPTMS/Ag(8 nm)/MoO3(30 nm) structure. For the OLEDs with the optimized anode, the maximum electroluminescence(EL) current efficiency reaches 4.5 cd/A, and the maximum brightness is 37 036 cd/m2. Moreover, the OLEDs with the optimized anode exhibit a very low operating voltage(2.6 V) for obtaining brightness of 100 cd/m2. We consider that the improved device performance is mainly attributed to the enhanced hole injection resulting from the reduced hole injection barrier height. Our results indicate that employing the MPTMS/Ag/MoO3 as a composite anode can be a simple and promising technique in the fabrication of low-operating voltage and high-brightness OLEDs. 展开更多
关键词 anode brightness fabrication attributed reaches fabricate transparent transmittance optimizing interlayer
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