Efficient solution-processed small-molecule single emitting layer electrophosphorescent white light-emitting diodes
Efficient solution-processed small-molecule single emitting layer electrophosphorescent white light-emitting diodes
复制标题
高效溶液加工小分子单发射层电致磷光白光发光二极管
DOI：
10.1016/j.orgel.2010.05.015
复制
发表时间：
2010-08-01
影响因子：
3.2
通讯作者：
Qiu, Yong
中科院分区：
文献类型：
--
作者：
Hou, Liudong;Duan, Lian;Qiu, Yong
采用溶液法制备了高效的小分子单发光层白色有机电致发光二极管(WOLED)。采用溶液可加工的宽禁带化合物9，9-bis[4-(3，6-di-tert-butylcarbazol-9-yl)phenyl]作为基质材料，通过掺杂1，3-bis[(4-tert-butylphenyl)-1，3，4-oxidiazol-yl]-7来增强发射层中的电子传输。优化的三种磷光掺杂的单有源层WOLED的最大亮度效率为20.8cda(1)，最大亮度为26600cdm(2)。增加空穴阻挡/电子传输层的双层WOLED的最大效率进一步提高到29.6cda(1)。器件的颜色随着偏置电压的变化而略有变化。通过对单发光层的瞬时光致发光的测量，讨论了单层发光层的能量传递过程和白光发射的来源。(C)2010爱思唯尔B.V.保留所有权利。
Efficient single emitting layer electrophosphorescent white organic light-emitting diodes (WOLEDs) based on small molecules were fabricated by solution process. A solution processible wide-gap compound 9,9-bis[4-(3,6-di-tert-butylcarbazol-9-yl)phenyl] fluorene (TBCPF) was used as the host material and 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxidiazol-yl] phenylene (OXD-7) was doped to enhance the electron transport in the emission layer. The optimized single active layer WOLED with three phosphorescent dopants showed a maximum luminance efficiency of 20.8 cd A (1) and a maximum luminance of 26,600 cd m (2). And the maximum efficiency of double-layer WOLEDs with an additional hole-blocking/electron-transporting layer was further improved to 29.6 cd A (1). The color of the devices shifted slightly with the bias voltage. The energy transfer processes and the origin of the white emission in the single emitting layer were also discussed based on the measurement of the transient photoluminescence. (C) 2010 Elsevier B.V. All rights reserved.