摘要
通过采用4,4'-bis(9-ethyl-3-carbazovinylene)-1,1'-biphenyl(BCzVBi)为蓝色荧光发光单元,绿色磷光材料fac tris(2-phenylpyridine)iridium[Ir(ppy)3]敏化红色荧光材料4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran(DCJTB)为混合黄色发光单元,制备了一组白光有机电致发光器件。通过对染料掺杂浓度的优化,以及引入适当厚度的4,4-N,N-dicarbazole-biphenyl(CBP)作为中间层,获得了高效率、高显色指数的白光有机电致发光器件。器件在100 cd/m2亮度下的最高显色指数达到了90,此时的色坐标为(0.32,0.32),非常接近白光等能点。该组器件的最大电流效率达到了11.00 cd/A,相应器件的最大亮度为13 330 cd/m2。
We report white organic light-emitting devices (WOLEDs) based on blue fluorescent and yellow phosphor-sensitized-fluorescent emission. In the devices, 4, 4'-bis (9-ethyl-3-carbazovi- nylene)-1 ,1'-bipheny (BCzVBi) acts as a blue emitter, and 4-(dicyanomethylene)-2-tert-butyl-6- (1,1,7,7-tetramethyljulolidin-4-yl-vinyl) -4H-pyran (DCJTB) sensitized by a phosphorescent material, fac tris(2-phenylpyridine) iridium [ Ir (ppy)3 ], acts as a mixed yellow light-emitting layer. By optimizing the doping concentration of dyes and introducing an interlayer, efficient WOLEDs with high color rendering index (CRI) values are obtained. In particular, one device shows a very high CRI value of 90 with a Commission Intemationale De l'Eclairage coordinates of (0.32,0.32) at 100 cd/m^2. The maximum current efficiency of the WOLEDs is 11.00 cd/A and the highest brightness of the device is 13 330 cd/m^2.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2012年第1期97-101,共5页
Chinese Journal of Luminescence
基金
国家重点基础研究发展计划(2010CB327701)
国家自然科学基金(60977024)资助项目