接近100%！钙钛矿基LED发光效率创纪录

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daite1978 2018-11-10 21:24

钙钛矿基LED

zhoutao 2018-11-10 21:57

钙钛矿基LED

tassy 2018-11-11 00:17

可与有机LED应用于显示

dushunli 2018-11-11 00:20

发光效率创记录！

redplum 2018-11-11 00:25

好牛逼啊

mang2004 2018-11-11 00:26

摘要： oJ*1>7[J  
Perovskite-based optoelectronic devices are gaining much attention owing to their remarkable performance and low processing cost, particularly for solar cells. However, for perovskite light-emitting diodes, non-radiative charge recombination has limited the electroluminescence efficiency. Here we demonstrate perovskite–polymer bulk heterostructure light-emitting diodes exhibiting external quantum efficiencies of up to 20.1% (at current densities of 0.1–1 mA cm−2). The light-emitting diode emissive layer comprises quasi-two-dimensional and three-dimensional (2D/3D) perovskites and an insulating polymer. Photogenerated excitations migrate from quasi-2D to lower-energy sites within 1 ps, followed by radiative bimolecular recombination in the 3D regions. From near-unity external photoluminescence quantum efficiencies and transient kinetics of the emissive layer with and without charge-transport contacts, we find non-radiative recombination pathways to be effectively eliminated, consistent with optical models giving near 100% internal quantum efficiencies. Although the device brightness and stability (T50 = 46 h in air at peak external quantum efficiency) require further improvement, our results indicate the significant potential of perovskite-based photon sources.

likaihit 2018-11-11 00:26

这是什么原理

bairuizheng 2018-11-11 00:39

：“从二维区域到三维区域的能量迁移发生得非常快，且三维区域内的电荷与聚合物的缺陷相互隔离，这些机制可以防止缺陷‘捣乱’，从而防止能量损失。

刘明欢聪慧 2018-11-11 07:09

钙钛矿层整合进发光二极管（LED）内，得到的产品内部发光效率接近创纪录的100%，可与最好的有机LED（OLED）相媲美，未来有望应用于显示、照明、通信及下一代太阳能电池领域。

zhangyuqian1 2018-11-11 07:53

厉害了啊