Perovskite light-emitting diodes (PeLEDs) have attracted much attentions due to the superior optoelectronic properties such as pure spectrum, high photoluminescence quantum yield, tunable emission, and ease of fabrication. Though lots of progresses have been made on PeLEDs and optically pumped lasers, microcavity perovskite lasing device under electrical pumping remains extremely challenging. Microcavity perovskite LEDs can be considered as a step toward laser diode due to the common structure of resonant cavity. In this study, a new type of metal-dielectric microcavity PeLED is designed and fabricated by using 2.5 pairs of TiO₂/SiO₂ distributed bragg reflector (DBR) and Al as cavity coplanar mirrors. A microcavity device with forward spectral full-width at half-maximum of 11.8 and 9.5 nm, under electrical and optical excitations, respectively, the directional forward emission within 30° is enhanced by 3 times compared to the control device without cavity is realized. To the best of the knowledge, this study demonstrates the narrowest spectrum for three-demisional PeLEDs so far, it helps to expand the color space in display applications and may also serve as a reference device for solution processed perovskite exciton–polariton electroluminescent devices and electrically driven vertical cavity surface emitting lasers due to the similar device structure and processing.

中文翻译：

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微腔对钙钛矿发光二极管定向发射光谱的窄化和增强

钙钛矿发光二极管（PeLEDs）由于具有纯光谱、高光致发光量子产率、可调谐发射和易于制造等优异的光电特性而备受关注。尽管在 PeLED 和光泵浦激光器方面取得了很多进展，但电泵浦下的微腔钙钛矿激光器件仍然极具挑战性。由于谐振腔的共同结构，微腔钙钛矿 LED 可以被视为向激光二极管迈出的一步。_{本研究采用2.5对TiO 2} /SiO ₂设计制造了一种新型金属介电微腔PeLED。分布式布拉格反射器（DBR）和Al作为腔共面镜。实现了前向光谱半峰全宽为11.8 nm和9.5 nm的微腔器件，在电激发和光激发下，与无腔对照器件相比，30°内的定向前向发射增强了3倍。据了解，这项研究展示了迄今为止三半 PeLED 的最窄光谱，它有助于扩展显示应用中的色彩空间，也可以作为溶液处理的钙钛矿激子-极化子电致发光器件和电致发光器件的参考器件。由于相似的器件结构和工艺，驱动垂直腔面发射激光器。