Padhiar Muhammad Amin, Ji Yongqiang, Wang Jing, Khan Noor Zamin, Xiong Mengji, Wang Shuxin
School of Intelligent Manufacturing, Shanghai Zhongqiao Vocational and Technical University, Shanghai 201205, China.
School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.
Nanomaterials (Basel). 2025 Apr 28;15(9):674. doi: 10.3390/nano15090674.
The persistent operational instability of all-inorganic cesium lead halide (CsPbX) perovskite nanocrystals (NCs) has hindered their integration into white-light-emitting diodes (WLEDs). This study introduces a transformative approach by engineering a phase transition from CsPbBr NCs to zirconium bromide (ZrBr)-stabilized hexagonal nanocomposites (HNs) through a modified hot-injection synthesis. Structural analyses revealed that the ZrBr-mediated phase transformation induced a structurally ordered lattice with minimized defects, significantly enhancing charge carrier confinement and radiative recombination efficiency. The resulting HNs achieved an exceptional photoluminescence quantum yield (PLQY) of 92%, prolonged emission lifetimes, and suppressed nonradiative decay, attributed to effective surface passivation. The WLEDs with HNs enabled a breakthrough luminous efficiency of 158 lm/W and a record color rendering index (CRI) of 98, outperforming conventional CsPbX-based devices. The WLEDs exhibited robust thermal stability, retaining over 80% of initial emission intensity at 100 °C, and demonstrated exceptional operational stability with negligible PL degradation during 50 h of continuous operation at 100 mA. Commission Internationale de l'Éclairage (CIE) coordinates of (0.35, 0.32) validated pure white-light emission with high chromatic fidelity. This work establishes ZrBr-mediated HNs as a paradigm-shifting material platform, addressing critical stability and efficiency challenges in perovskite optoelectronics and paving the way for next-generation, high-performance lighting solutions.
全无机铯铅卤化物（CsPbX）钙钛矿纳米晶体（NCs）持续存在的操作不稳定性阻碍了它们集成到白光发光二极管（WLED）中。本研究引入了一种变革性方法，通过改进的热注入合成技术，设计了从CsPbBr纳米晶体到溴化锆（ZrBr）稳定的六方纳米复合材料（HNs）的相变。结构分析表明，ZrBr介导的相变诱导了结构有序且缺陷最小化的晶格，显著提高了电荷载流子的限制和辐射复合效率。所得的HNs实现了92%的优异光致发光量子产率（PLQY）、延长的发射寿命以及抑制的非辐射衰变，这归因于有效的表面钝化。含有HNs的WLED实现了158 lm/W的突破性发光效率和98的创纪录显色指数（CRI），优于传统的基于CsPbX的器件。这些WLED表现出强大的热稳定性，在100°C时保留了超过80%的初始发射强度，并且在100 mA下连续运行50小时期间表现出卓越的操作稳定性，PL降解可忽略不计。国际照明委员会（CIE）坐标（0.35，0.32）验证了具有高色度保真度的纯白光发射。这项工作将ZrBr介导的HNs确立为一个范式转变的材料平台，解决了钙钛矿光电子学中的关键稳定性和效率挑战，并为下一代高性能照明解决方案铺平了道路。
