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首页> 外文期刊>Physica, B. Condensed Matter >Non-doped phosphorescent white organic light-emitting devices with a quadruple-quantum-well structure
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Non-doped phosphorescent white organic light-emitting devices with a quadruple-quantum-well structure

机译：具有四量子阱结构的非掺杂磷光白色有机发光器件

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摘要

Non-doped white organic light-emitting devices (WOLEDs) with a quadruple-quantum-well structure were fabricated. An alternate layer of ultrathin blue and yellow iridium complexes was employed as the potential well layer, while potential barrier layers (PBLs) were chosen to be 2,2,2-(1,3,5-benzenetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) or N,N-dicarbazolyl-3,5-benzene (mCP) combined TPBi. On adjusting the PBLs for device performance comparison, the results showed that the device with all-TPBi PBLs exhibited a yellow emission with the color coordinates of (0.50,0.47) at a luminance of 1000 cd/m ~2, while stable white emission with the color coordinates of (0.36,0.44) was observed in the device using mCP combined TPBi as the PBLs. Meanwhile, for the WOLED, with a reduced efficiency roll-off, a maximum luminance, luminous efficiency, and external quantum efficiency of 12,610 cd/m ~2, 10.2 cd/A, and 4.4%, respectively, were achieved. The performance improvement by the introduction of mCP PBL was ascribed to the well confined exciton and the reduced exciton quenching effect in the multiple emission regions.
机译：制备了具有四量子阱结构的非掺杂白色有机发光器件（WOLED）。超薄蓝色和黄色铱配合物的交替层用作势阱层，而势垒层（PBL）选择为2,2,2-（1,3,5-苯三基）-三（1-苯基） -1-H-苯并咪唑）（TPBi）或N，N-二咔唑-3,5-苯（mCP）组合TPBi。在调整PBL以进行器件性能比较时，结果表明，具有全TPBi PBL的器件在1000 cd / m〜2的亮度下呈现黄色发光，色坐标为（0.50,0.47），而在白色发光条件下稳定显示白色。在使用mCP组合TPBi作为PBL的设备中观察到（0.36,0.44）的色坐标。同时，对于WOLED，具有降低的效率滚降，最大亮度，发光效率和外部量子效率分别达到12,610 cd / m〜2、10.2 cd / A和4.4％。通过引入mCP PBL可以改善性能，这归因于在多个发射区域中限制的激子和减少的激子猝灭效应。

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