Shi Jindou, Wang Zeyu, Gaponenko Nikolai V, Da Zheyuan, Zhang Chen, Wang Junnan, Ji Yongqiang, Ding Yusong, Yao Qing, Xu Youlong, Wang Minqiang
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research&Shannxi Engineering Research Center of Advanced Energy Materials and Devices, Xi'an Jiaotong University, Xi'an, 710049, China.
Frontier Institute of Science and Technology (FIST), Micro- and Nano-technology Research Center of State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Small. 2024 Jul;20(28):e2310478. doi: 10.1002/smll.202310478. Epub 2024 Feb 9.
Addressing the challenge of lighting stability in perovskite white light emitting diodes (WLEDs) is crucial for their commercial viability. CsPbX (X = Cl, Br, I, or mixed) nanocrystals (NCs) are promising for next-generation lighting due to their superior optical and electronic properties. However, the inherent soft material structure of CsPbX NCs is particularly susceptible to the elevated temperatures associated with prolonged WLED operation. Additionally, these NCs face stability challenges in high humidity environments, leading to reduced lighting performance. This study introduces a two-step dual encapsulation method, resulting in CsPbBr@SiO/AlSiO composite fibers (CFs) with enhanced optical stability under extreme conditions. In testing, WLEDs incorporating these CFs, even under prolonged operation at high power (100 mA for 9 h), maintain consistent electroluminescence (EL) intensity and optoelectronic parameters, with surface temperatures reaching 84.2 °C. Crucially, when subjected to 85 °C and 85% relative humidity for 200 h, the WLEDs preserve 97% of their initial fluorescence efficiency. These findings underscore the efficacy of the dual encapsulation strategy in significantly improving perovskite material stability, marking a significant step toward their commercial application in optoelectronic lighting.
解决钙钛矿白光发光二极管（WLED）中的发光稳定性挑战对其商业可行性至关重要。CsPbX（X = Cl、Br、I或混合）纳米晶体（NCs）因其优异的光学和电子性能而有望用于下一代照明。然而，CsPbX NCs固有的软材料结构特别容易受到与WLED长时间运行相关的高温影响。此外，这些NCs在高湿度环境中面临稳定性挑战，导致照明性能下降。本研究引入了一种两步双封装方法，得到了在极端条件下具有增强光学稳定性的CsPbBr@SiO/AlSiO复合纤维（CFs）。在测试中，包含这些CFs的WLED即使在高功率（100 mA，持续9小时）的长时间运行下，也能保持一致的电致发光（EL）强度和光电参数，表面温度达到84.2°C。至关重要的是，当在85°C和85%相对湿度下放置200小时时，WLED保留了其初始荧光效率的97%。这些发现强调了双封装策略在显著提高钙钛矿材料稳定性方面的有效性，标志着其在光电照明商业应用方面迈出了重要一步。
