Origin of Efficiency Roll-Off in Colloidal Quantum-Dot Light-Emitting Diodes
Origin of Efficiency Roll-Off in Colloidal Quantum-Dot Light-Emitting Diodes
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DOI：
10.1103/physrevlett.110.217403
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发表时间：
2013-05-21
影响因子：
8.6
通讯作者：
Bulovic, Vladimir
中科院分区：
文献类型：
--
作者：
Shirasaki, Yasuhiro;Supran, Geoffrey J.;Bulovic, Vladimir
通过比较量子点电致发光和光致发光，研究了胶体量子点发光二极管效率下降的原因。我们发现，电场诱导的量子点发光效率的下降，而不是电荷泄漏或量子点充电（俄歇复合）是负责滚降行为，并使用量子限制斯塔克效应，准确地预测量子点发光二极管的外部量子效率滚降。
We study the origin of efficiency roll-off (also called "efficiency droop") in colloidal quantum-dot light-emitting diodes through the comparison of quantum-dot (QD) electroluminescence and photoluminescence. We find that an electric-field-induced decrease in QD luminescence efficiency-and not charge leakage or QD charging (Auger recombination)-is responsible for the roll-off behavior, and use the quantum confined Stark effect to accurately predict the external quantum efficiency roll-off of QD light-emitting diodes.