Shi Jindou, Ge Wanyin, Tian Ye, Xu Meimei, Gao Wenxing, Wu Yuanting
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, P. R. China.
The New Style Think Tank of Shaanxi Universities (Research Center for Auxiliary Chemistry and New Materials Development, Shaanxi University of Science and Technology), Xi'an, Shaanxi, 710021, P. R. China.
Small. 2021 Apr;17(14):e2006568. doi: 10.1002/smll.202006568. Epub 2021 Mar 11.
Ensuring the stability of all-inorganic halide perovskite light-emitting diodes (LEDs) has become an obstacle that needs to be broken for commercial applications. Currently, lead halide perovskite CsPbX (X = Br, I, Cl) nanocrystals (NCs) are considered as alternative materials for future fluorescent lighting devices due to their combination of superior optical and electronic properties. However, the temperature of the surface of the LEDs will increase after long-term power-on work, which greatly affects the optical stability of CsPbX NCs. In order to overcome this bottleneck issue, a strategy of annealing perovskite materials in liquid is proposed, and the changes in photoluminescence and electroluminescence (EL) behaviors before and after annealing are studied. The results show that the luminescence stability of the annealed perovskite materials is significantly improved. Moreover, the EL stability of different perovskite LED devices under long-term operation is monitored, and the performance of the annealed materials is particularly outstanding. The results have proved that this convenient and low-cost liquid annealing strategy is suitable for large-scale postprocessing of perovskite materials, granting them stable fluorescence emission, which will bring a new dawn to the commercialization of next-generation optoelectronic devices.
确保全无机卤化物钙钛矿发光二极管（LED）的稳定性已成为其商业应用需要突破的障碍。目前，卤化铅钙钛矿CsPbX（X = Br、I、Cl）纳米晶体（NCs）因其优异的光学和电子性能组合，被视为未来荧光照明设备的替代材料。然而，LED长期通电工作后其表面温度会升高，这极大地影响了CsPbX NCs的光学稳定性。为克服这一瓶颈问题，提出了在液体中对钙钛矿材料进行退火的策略，并研究了退火前后光致发光和电致发光（EL）行为的变化。结果表明，退火后的钙钛矿材料发光稳定性显著提高。此外，监测了不同钙钛矿LED器件在长期运行下的EL稳定性，退火材料的性能尤为突出。结果证明，这种便捷且低成本的液体退火策略适用于钙钛矿材料的大规模后处理，赋予它们稳定的荧光发射，这将为下一代光电器件的商业化带来新曙光。
