Nearly 100% internal phosphorescence efficiency in an organic light-emitting device
Nearly 100% internal phosphorescence efficiency in an organic light-emitting device
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DOI：
10.1063/1.1409582
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发表时间：
2001-11-15
影响因子：
3.2
通讯作者：
Forrest, SR
中科院分区：
文献类型：
--
作者：
Adachi, C;Baldo, MA;Forrest, SR
我们在有机电致发光器件中采用磷光分子掺杂到宽能隙基质中，展示了非常高效率的电致磷光。将双（2-苯基吡啶）乙酰丙酮铱[（ppy）（2）Ir（acac）]掺杂到3-苯基-4（1 '-萘基）-5-苯基-1，2，4-三氮唑中，获得了最大外量子效率（19.0 ± 1.0）%和发光功率效率（60 ± 5）lm/W。（ppy）（2）Ir（acac）的光致发光效率中观察到的热激活非辐射损失的不存在支持计算出的（87 +/-7）%的内量子效率。因此，非常高的外部量子效率是由于（ppy）（2）Ir（acac）的接近100%的内部磷光效率与平衡的空穴和电子注入以及发光层内的三重态激子限制耦合。(C)2001年美国物理学会。
We demonstrate very high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent molecule doped into a wide energy gap host. Using bis(2-phenylpyridine)iridium(III) acetylacetonate [(ppy)(2)Ir(acac)] doped into 3-phenyl-4(1'-naphthyl)-5-phenyl-1,2,4-triazole, a maximum external quantum efficiency of (19.0 +/-1.0)% and luminous power efficiency of (60 +/-5) lm/W are achieved. The calculated internal quantum efficiency of (87 +/-7)% is supported by the observed absence of thermally activated nonradiative loss in the photoluminescent efficiency of (ppy)(2)Ir(acac). Thus, very high external quantum efficiencies are due to the nearly 100% internal phosphorescence efficiency of (ppy)(2)Ir(acac) coupled with balanced hole and electron injection, and triplet exciton confinement within the light-emitting layer. (C) 2001 American Institute of Physics.