Halide Homogenization for High-Performance Blue Perovskite Electroluminescence.

Halide Homogenization for High-Performance Blue Perovskite Electroluminescence.
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用于高性能蓝色钙钛矿电致发光的卤化物均质化

DOI:
10.34133/2020/9017871
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发表时间:
2020
期刊:
Research (Washington, D.C.)
影响因子:
--
通讯作者:
Wang J
Wang J
中科院分区:
其他
文献类型:
--
作者:
Cheng L;Yi C;Tong Y;Zhu L;Kusch G;Wang X;Wang X;Jiang T;Zhang H;Zhang J;Xue C;Chen H;Xu W;Liu D;Oliver RA;Friend RH;Zhang L;Wang N;Huang W;Wang J

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近年来,金属卤化物钙钛矿发光二极管(LED)取得了很大的进展。然而,明亮且光谱稳定的蓝色钙钛矿LED仍然是一个重大挑战。三维混合卤化物钙钛矿具有实现高亮度电致发光的潜力,但由于卤化物相分离,其发射光谱不稳定。在这里,我们发现,已经有不均匀分布的卤化物在沉积的钙钛矿薄膜,这可以追溯到卤化物的不均匀混合物的前体。通过简单地引入阳离子表面活性剂来改善前驱体溶液中卤化物的均匀性,我们可以克服相分离问题并获得光谱稳定的单相蓝光钙钛矿。我们展示了具有高亮度的高效蓝色钙钛矿LED,4.7、2.9和0.4 lm W−1的发光效率,天蓝色、蓝色和深蓝色的亮度超过37,000、9,300和1,300 cd m−2,国际照明委员会(CIE)坐标为(0.068,0.268)、(0.091,0.165)和(0.129,0.061),表明钙钛矿用于LED应用的真实的前景。
Metal halide perovskite light-emitting diodes (LEDs) have achieved great progress in recent years. However, bright and spectrally stable blue perovskite LED remains a significant challenge. Three-dimensional mixed-halide perovskites have potential to achieve high brightness electroluminescence, but their emission spectra are unstable as a result of halide phase separation. Here, we reveal that there is already heterogeneous distribution of halides in the as-deposited perovskite films, which can trace back to the nonuniform mixture of halides in the precursors. By simply introducing cationic surfactants to improve the homogeneity of the halides in the precursor solution, we can overcome the phase segregation issue and obtain spectrally stable single-phase blue-emitting perovskites. We demonstrate efficient blue perovskite LEDs with high brightness, e.g., luminous efficacy of 4.7, 2.9, and 0.4 lm W−1 and luminance of over 37,000, 9,300, and 1,300 cd m−2 for sky blue, blue, and deep blue with Commission Internationale de l'Eclairage (CIE) coordinates of (0.068, 0.268), (0.091, 0.165), and (0.129, 0.061), respectively, suggesting real promise of perovskites for LED applications.
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