Improving the Efficiency and Stability of Green-Light Perovskite CsPbBr3 LEDs via Low-Temperature Annealing

ACS Applied Optical Materials Pub Date : 2025-03-11 DOI:10.1021/acsaom.5c0001610.1021/acsaom.5c00016

Hui-Lian Zhou, Ya-Yang He, Yong Wang, Cheng-Yang Zhou, Hong-Wei Hu*, Yun Zhang* and Guang-Gui Cheng,

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Abstract

All-inorganic lead bromide perovskite CsPbBr₃ has garnered considerable attention due to its high thermal stability and rapid radiative recombination. Unfortunately, it is still a big challenge to further improve the efficiency and stability of the CsPbBr₃ film via the solution processing technique. In this study, we report a method to enhance the CsPbBr₃ film quality via annealing at a low temperature of 38 °C. The low-temperature annealing slows the phase transition, allowing for the orderly arrangement of crystal orientations and a surface with fewer defects. With this method, the fabricated CsPbBr₃ PeLED exhibits great stability and bright luminescence, achieving an external quantum efficiency (EQE) of 8.21%. The PeLEDs fabricated at 38 °C demonstrated a low turn-on voltage of 1.5 V, with high current densities of 66.8 mA/cm² at 2.0 V and 371 mA/cm² at 3.0 V. These results provide valuable insights for the realization of high-efficiency and high-stability PeLEDs for lighting and display applications.

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通过低温退火提高绿光钙钛矿CsPbBr3 led的效率和稳定性

全无机溴化铅钙钛矿CsPbBr3因其高的热稳定性和快速的辐射复合而受到广泛关注。遗憾的是，通过溶液加工技术进一步提高CsPbBr3薄膜的效率和稳定性仍然是一个很大的挑战。在本研究中，我们报道了一种在38℃低温下退火提高CsPbBr3薄膜质量的方法。低温退火减缓了相变，使晶体取向排列有序，表面缺陷较少。利用该方法制备的CsPbBr3 PeLED具有良好的稳定性和明亮的发光，实现了8.21%的外量子效率（EQE）。在38°C下制备的ped具有1.5 V的低导通电压，在2.0 V和3.0 V下具有66.8 mA/cm2和371 mA/cm2的高电流密度。这些结果为实现用于照明和显示应用的高效率和高稳定性ped提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Optical Materials 材料科学-光学材料-

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： ACS Applied Optical Materials is an international and interdisciplinary forum to publish original experimental and theoretical including simulation and modeling research in optical materials complementing the ACS Applied Materials portfolio. With a focus on innovative applications ACS Applied Optical Materials also complements and expands the scope of existing ACS publications that focus on fundamental aspects of the interaction between light and matter in materials science including ACS Photonics Macromolecules Journal of Physical Chemistry C ACS Nano and Nano Letters.The scope of ACS Applied Optical Materials includes high quality research of an applied nature that integrates knowledge in materials science chemistry physics optical science and engineering.