Perovskite light-emitting diodes (PeLEDs) have shown great potential for low-cost display and lighting technologies, and all-inorganic blue PeLEDs are recognized as a promising substitute for blue fluorescent/phosphorescent organic light-emitting diodes (OLEDs) owing to their superior color purity and great stability potential. However, confined by the solution fabrication process, depositing multi-layered white PeLEDs remains a challenge. Here, a newly designed hybrid perovskite/organic tandem white LED (POTWLED), integrated with a bottom blue PeLED unit and a top orange/(orange + red) OLED unit, to prevent damage to the underlying perovskite layer caused by the deposition of the top emitting layers, is reported. To optimize the performance of POTWLEDs, a conductive passivator of 2,8-bis(diphenylphosphoryl)dibenzo[b,d] thiophene, with a strong surface binding group of P═O, is introduced to passivate perovskite defects, which promotes a maximum external quantum efficiency (EQE) of 17.3% for blue PeLEDs with an emission peak at 488 nm. As a result, based on the optimized blue PeLED units, a maximum EQE of 23.9% with a low color temperature of 2522 K is obtained for POTWLEDs, which is the highest efficiency for perovskite-based WLEDs, illustrating the great potential of the hybrid tandem device in fabricating high-performance perovskite-based WLEDs.

中文翻译：

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外量子效率超过20%的高效混合钙钛矿/有机串联白光发光二极管


钙钛矿发光二极管（PeLED）在低成本显示和照明技术方面显示出巨大潜力，全无机蓝色PeLED由于其优越的性能而被认为是蓝色荧光/磷光有机发光二极管（OLED）的有前途的替代品。颜色纯度和稳定性潜力巨大。然而，受溶液制造工艺的限制，沉积多层白色 PeLED 仍然是一个挑战。这里，一种新设计的混合钙钛矿/有机串联白光LED（POTWLED），与底部蓝色PeLED单元和顶部橙色/（橙色+红色）OLED单元集成，以防止由于沉积的钙钛矿层对下面的钙钛矿层造成损坏。据报道，顶部发射层。为了优化 POTWLED 的性能，引入了具有强表面结合基团 P=O 的 2,8-双（二​​苯基磷酰基）二苯并[b,d]噻吩导电钝化剂来钝化钙钛矿缺陷，从而促进最大外部蓝色 PeLED 的量子效率 (EQE) 为 17.3%，发射峰位于 488 nm。结果，基于优化的蓝色PeLED单元，POTWLED获得了23.9%的最大EQE和2522 K的低色温，这是基于钙钛矿的WLED的最高效率，说明了混合串联的巨大潜力制造高性能基于钙钛矿的 WLED 的设备。