通过调制准二维蓝色钙钛矿发光二极管的复合区位置，实现效率超过 5%的器件。
Modulation of recombination zone position for quasi-two-dimensional blue perovskite light-emitting diodes with efficiency exceeding 5.
机构信息
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, 510640, Guangzhou, China.
出版信息
Nat Commun. 2019 Mar 4;10(1):1027. doi: 10.1038/s41467-019-09011-5.
In recent years, substantial progress has been made in developing perovskite light-emitting diodes with near-infrared, red and green emissions and over 20% external quantum efficiency. However, the development of perovskite light-emitting diodes with blue emission remains a great challenge, which retards further development of full-color displays and white-light illumination based on perovskite emissive materials. Here, firstly, through composition and dimensional engineering, we prepare quasi-two-dimensional perovskite thin films with improved blue emission, taking advantages of reduced trap density and enhanced photoluminescence quantum yield. Secondly, we find a vertically non-uniform distribution of perovskite crystals in the PEDOT:PSS/perovskite hybrid film. Through modulating the position of the recombination zone, we activate the majority of quasi-two-dimensional perovskite crystals, and thus demonstrate the most efficient blue perovskite light-emitting diode to date with emission peak at 480 nm, record luminance of 3780 cd m and record external quantum efficiency of 5.7%.
近年来，在开发具有近红外、红和绿发射以及超过 20%外量子效率的钙钛矿发光二极管方面取得了重大进展。然而，开发具有蓝色发射的钙钛矿发光二极管仍然是一个巨大的挑战，这阻碍了基于钙钛矿发光材料的全彩显示器和白光照明的进一步发展。在这里，我们首先通过组成和维度工程，制备了具有改善的蓝色发射的准二维钙钛矿薄膜，利用减少的陷阱密度和增强的光致发光量子产率。其次，我们发现 PEDOT:PSS/钙钛矿混合膜中存在钙钛矿晶体的垂直非均匀分布。通过调节复合区的位置，我们激活了大部分准二维钙钛矿晶体，从而展示了迄今为止效率最高的蓝色钙钛矿发光二极管，其发射峰位于 480nm，记录亮度为 3780cd/m²，记录外量子效率为 5.7%。
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