Electron and hole transport in a wide bandgap organic phosphine oxide for blue electrophosphorescence
Electron and hole transport in a wide bandgap organic phosphine oxide for blue electrophosphorescence
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DOI：
10.1063/1.2885117
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发表时间：
2008-02-25
影响因子：
4
通讯作者：
Burrows, Paul E.
中科院分区：
文献类型：
--
作者：
Cai, Xiuyu;Padmaperuma, Asanga B.;Burrows, Paul E.
本文报道了以N-（4-二苯基磷酰基苯基）咔唑（MPO_（12））为双极性基质，掺杂双[（4，6-二氟苯基）-吡啶基-N，C（2 ′-吡啶甲酸）]铱（FIrpic）的蓝色磷光有机电致发光器件（OLED）.在亮度为800 cd/m（2）时，无外耦合增强，外量子效率和工作电压分别为9.1（-0.1）%和4.8 V。通过改变OLED的层结构，我们表明，MPO 12是能够传输电子和空穴，与以前的演示使用二膦氧化物，只传输电子。改进的空穴传输导致改进的器件效率。(c)2008年美国物理研究所。
We report blue phosphorescent organic light-emitting devices (OLEDs) using an ambipolar host, N-(4-diphenylphosphoryl phenyl) carbazole (MPO12), doped with iridium (111) bis[(4,6-difluorophenyl)-pyridinato-N, C(2)']picolinate (FIrpic). The external quantum efficiency and operating voltage is 9.1(-0.1)% and 4.8 V, respectively, measured at a brightness of 800 cd/m(2) with no outcoupling enhancement. By varying the layer structure of the OLEDs, we show that MPO12 is capable of transporting both electrons and holes, in contrast to previous demonstrations using diphosphine oxides, which only transported electrons. The improved hole transport results in improved device efficiency. (c) 2008 American Institute of Physics.