Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr₃)@PbBr(OH). We note that this strategy is universal to MAPbBr₃, formamidine lead bromide perovskite (FAPbBr₃), inorganic lead bromide perovskite (CsPbBr₃), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m² when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.

长期以来，稳定性差一直是阻碍铅基卤化物钙钛矿实际应用的关键问题之一。在本文中，通过引入水，溴化物基钙钛矿的光致发光（PL）量子产率（QY）可以从2.5％增加到71.54％，并且在水溶液中的样品PL QY在1年内最小程度地降低。增强的稳定性和PL QY可以归因于水诱导的甲基氨基溴化铅钙钛矿（MAPbBr ₃）@PbBr（OH）。我们注意到，这个策略是普遍到MAPbBr ₃，甲脒溴化铅钙钛矿（FAPbBr ₃），无机铅钙钛矿溴化（CsPbBr ₃通过使用制备的钙钛矿作为荧光粉在365 nm UV芯片上制造发光器件（LED）。当驱动电流为200 mA时，LED的亮度强度为9549 cd / m ²，在LED的照明下可以清楚地观察到玻璃表面的斑点。这项工作为高度稳定和高效的钙钛矿提供了新的策略。