Operating lifetime of phosphorescent organic light emitting devices
Operating lifetime of phosphorescent organic light emitting devices
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DOI：
10.1063/1.126386
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发表时间：
2000-05-01
影响因子：
4
通讯作者：
Michalski, L
中科院分区：
文献类型：
--
作者：
Burrows, PE;Forrest, SR;Michalski, L
研究了以磷光掺杂2，3，7，8，12，13，17，18-octaethyl-21H，23H-porphine铂(II)为发光分子的有机电致发光器件(OLED)的连续工作寿命。我们基于两种不同的电子传输主体：三(8-羟基喹啉)铝和4，4‘-N，N’-二氨基联苯(CBP)对器件进行了表征。在运行的前50小时内，OLED的亮度损失类似于25%，然后是极其缓慢的退化，暗斑的增长可以忽略不计。在50%占空比脉冲工作下，在平均电流密度为10 mA/cm(2)的情况下，预计初始亮度为50%的CBP基磷光OLED的器件寿命为10(7)h。这些极长的寿命被认为是电致磷光OLED的固有特性，其中辐射荧光粉显著缩短了导电主体材料中潜在反应三重态的寿命。(C)2000年美国物理研究所。[S0003-6951(00)02018-0]。
We investigate the continuous operating lifetime of organic light emitting devices (OLEDs) using the phosphorescent dopant, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine platinum (II) as the light emitting molecule. We characterize devices based on two different electron transporting hosts: tris-(8-hydroxyquinoline) aluminum and 4,4'-N,N'-dicarbazolyl-biphenyl (CBP). The OLEDs lose similar to 25% of their luminance in the first 50 h of operation, followed by extremely slow degradation with negligible growth of dark spots. The device lifetime of CBP-based phosphorescent OLEDs projected to 50% initial brightness is > 10(7) h at a mean current density of 10 mA/cm(2) under 50% duty cycle pulsed operation. These extremely long lifetimes are speculated to be an intrinsic property of electrophosphorescent OLEDs, where radiative phosphors significantly shorten the lifetime of potentially reactive triplet states in the conductive host material. (C) 2000 American Institute of Physics. [S0003-6951(00)02018-0].