溶剂效应对聚喹啉铝发光特性的影响

研究了非共轭聚喹啉铝（Palq)在氯仿和乙醇不同极性的溶剂下所获得的薄膜的吸收和发光光谱。由于溶剂性的不同，聚喹啉铝链在氯仿和乙醇溶液中表现出不同的聚集状态。当各种溶液分别旋涂成膜时，溶液中的聚喹啉铝的聚集态仍部分地保存下来，导致不同聚喹啉铝薄膜的电子结构状态的差别。结果，聚喹啉铝的薄膜表现出不同的发光特性。实验表明，在制作聚合物器件中，溶剂的选择对共轭聚合物的发光特性有着重要的影响。     

荧光染料和磷光染料激子形成截面的比较

为了比较单线态激子与三线态激子形成截面的大小,作者将荧光染料4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) 和磷光材料factris-(2-phenylpyridine) iridium [Ir(ppy)₃]共掺杂在N-vinylcarbazole (PVK)中作为发光层,制作了多层有机电致发光器件。通过对其光致发光及电致发光特性的研究,计算出Ir(ppy)₃激子的形成截面比DCJTB激子的形成截面大得多。     

White organic light-emitting diodes based on a combined electromer and monomer emission in doubly-doped polymers

We report on white organic light-emitting diodes(WOLEDs) based on polyvinylcarbazole(PVK) doped with 1,1-bis((di-4-tolylamino)phenyl)cyclohexane(TAPC) and perylene,and investigate the luminescence mechanism of the devices.The chromaticity of light emission can be tuned by adjusting the concentration of the dopants.White light with the Commission Internationale de L’Eclairage(CIE) coordinates of(0.33,0.34) is achieved by mixing the yellow electromer emission of TAPC and the blue monomer emission of perylene from the device ITO/PVK:TAPC:perylene(100:9:1 in wt.)(100 nm)/tris-(8-hydroxyquinoline aluminum(Alq 3)(10 nm)/Al.The device exhibits a maximal luminance of 3727 cd/m2 and a current efficiency of 2cd/A.     

White organic light-emitting diodes based on combined electromer and monomer emission in doubly-doped polymers

We report on white organic light-emitting diodes (WOLEDs) based on polyvinylcarbazole (PVK) doped with 1,1-bis((di-4-tolylamino)phenyl)cyclohexane (TAPC) and perylene, and investigate the luminescence mechanism of the devices. The chromaticity of light emission can be tuned by adjusting the concentration of the dopants. White light with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.33, 0.34) is achieved by mixing the yellow electromer emission of TAPC and the blue monomer emission of perylene from the device ITO/PVK: TAPC: perylene (100:9:1 in wt.) (100 nm)/tris-(8-hydroxyquinoline aluminum (Alq₃) (10 nm)/Al. The device exhibits a maximal luminance of 3727 cd/m² and a current efficiency of 2 cd/A.     

Ir(PPY)3掺杂PVK的电致发光机理

近几年来发展起来的电致磷光(electrophosphorescence)是有机发光二极管(OLED)研究的新生长点。对电致磷光发光机理的研究随即得到了人们普遍的关注。比较了不同正向偏压条件下Ir(PPY)₃掺杂聚乙烯基咔唑(PVK)的光致发光(PL)和电致发光(EL)光谱。研究结果显示在电场和注入电流的共同作用下,PL光谱中基质PVK发光的相对强度并没有发生显著的变化。电场或注入载流子不会影响PVK向Ir(PPY)₃的能量传递。磷光掺杂聚合物EL主要是由于载流子在掺杂磷光分子上的直接复合,而不是由基质向磷光掺杂分子的能量传递。     

温度对稀土离子掺杂ZBLAN玻璃上转换发光的影响

研究了Er3+,Pr3+和Yb3+共掺杂ZBLAN玻璃在960nm激光泵浦下的上转换发光的温度特性.温度变化范围为室温到300℃.结果表明Pr3+离子的发光强度随温度的增加,先增加;达到极大后,随温度的增加下降.Er3+发光强度随温度增加单调下降.     

Hole Transport Properties of MEH-PPV at Different Excitation Wavelengths

Using the time-of-flight photocurrent measurements, we investigate the hole transport properties of polymer 2-methoxy, 5-（2＇-ethyl-hexyloxy）-1, 4-phenylene vinylene （MEH-PPV）. The change of hole transport properties from non-dispersive transport to a dispersive type is presented, with the increasing excitation wavelength near the MEH-PPV absorption edge. At room temperature, the effective mobility of MEH-PPV depends on the applied electric field as commonly seen in some organic materials.     

聚烷基芴电场调制光谱研究

有机发光材料和器件中相关物理机制是一个人们普遍关心的问题, 特别是电场作用下的有机半导体激发态的行为格外引起人们的关注。电场调制发光光谱是研究在电场中元激发的产生和发展的非常有效的方法。文章利用电场调制光致发光(PL)方法研究了聚烷基芴的PL电场猝灭效应,得到聚烷基芴激子离化随电场强度变化的规律和载流子平均跳跃距离。研究还显示PL猝灭因子随激发波长的变化,短波长激发光时猝灭因子大。