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Highly Efficient Visible Colloidal Lead-Halide Perovskite Nanocrystal Light-Emitting Diodes
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-02 00:00:00 , DOI: 10.1021/acs.nanolett.8b00789
Fei Yan , Jun Xing 1 , Guichuan Xing 2 , Lina Quan 1 , Swee Tiam Tan , Jiaxin Zhao , Rui Su , Lulu Zhang , Shi Chen , Yawen Zhao 3 , Alfred Huan , Edward H. Sargent 1 , Qihua Xiong 4 , Hilmi Volkan Demir 5
Affiliation  

Lead-halide perovskites have been attracting attention for potential use in solid-state lighting. Following the footsteps of solar cells, the field of perovskite light-emitting diodes (PeLEDs) has been growing rapidly. Their application prospects in lighting, however, remain still uncertain due to a variety of shortcomings in device performance including their limited levels of luminous efficiency achievable thus far. Here we show high-efficiency PeLEDs based on colloidal perovskite nanocrystals (PeNCs) synthesized at room temperature possessing dominant first-order excitonic radiation (enabling a photoluminescence quantum yield of 71% in solid film), unlike in the case of bulk perovskites with slow electron–hole bimolecular radiative recombination (a second-order process). In these PeLEDs, by reaching charge balance in the recombination zone, we find that the Auger nonradiative recombination, with its significant role in emission quenching, is effectively suppressed in low driving current density range. In consequence, these devices reach a maximum external quantum efficiency of 12.9% and a power efficiency of 30.3 lm W–1 at luminance levels above 1000 cd m–2 as required for various applications. These findings suggest that, with feasible levels of device performance, the PeNCs hold great promise for their use in LED lighting and displays.

中文翻译:

高效可见的胶体卤化铅钙钛矿纳米晶体发光二极管

卤化钙钛矿在固体照明中的潜在用途已引起人们的关注。跟随太阳能电池的脚步,钙钛矿发光二极管(PeLED)的领域正在迅速发展。然而,由于设备性能的各种缺陷,包括迄今为止可获得的有限水平的发光效率,它们在照明中的应用前景仍然不确定。在这里,我们展示了基于在室温下合成的胶态钙钛矿纳米晶体(PeNCs)的高效PeLED,它们具有主要的一阶激子辐射(使固体膜的光致发光量子产率达到71%),这与具有缓慢电子的块状钙钛矿的情况不同-空穴双分子辐射复合(二阶过程)。在这些PeLED中,通过在重组区达到电荷平衡,我们发现,在低发射电流密度范围内,俄格非辐射复合在发射猝灭中起着重要作用,可以有效地抑制这种复合。因此,这些器件的最大外部量子效率为12.9%,功率效率为30.3 lm W-1在高于为1000cd米亮度等级-2根据需要用于各种应用。这些发现表明,在设备性能达到可行水平的前提下,PeNC有望将其用于LED照明和显示器。
更新日期:2018-04-02
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