近日，广西大学邹炳锁团队揭示基于胶体CsPbBr₃纳米薄片的高效深蓝LED符合Rec.2020标准。相关论文于2025年9月22日发表在《光：科学与应用》杂志上。

胶体量子限制的CsPbBr₃纳米薄片（NPLs）具有窄的发射线宽和厚度可调的光致发光特性，使其成为深蓝色钙钛矿发光二极管（PeLEDs）的理想候选材料。然而，传统的长链配体（例如，油胺和油酸）的弱表面配位导致不良物质的正面堆积，导致不良物质的发光红移。

研究组报道了一种基于胶体CsPbBr₃ NPLs的高效深蓝PeLED，该PeLED通过酸辅助配体钝化策略实现，符合Rec.2020颜色标准。表面化学分析表明，氢溴酸有利于质子辅助剥离长链配体，随后与硫代三丁基膦形成稳定的Pb-S-P配位键，具有较高的吸附能（E_ads= -1.13eV）。这种方法显著改善了表面缺陷钝化，产生了96%的光致发光量子产率和窄的13nm全宽半最大深蓝色发射。增强的激子重组和降低的缺陷态密度证明了延长的光致发光寿命和较慢的吸收漂白剂恢复动力学。

由此产生的PeLEDs在基于CsPbBr₃ NPLs的系统中实现了破纪录的性能，在461nm，峰值亮度为143cd m^-2，符合Rec.2020标准的CIE颜色坐标（CIE-y=0.046）。这项工作为开发高效稳定的深蓝色钙钛矿发射器提供了有效的策略，展示了钙钛矿纳米材料在下一代超高清显示器中的商业化潜力。

附：英文原文

Title: Efficient deep-blue LEDs based on colloidal CsPbBr3 nanoplatelets meeting the Rec.2020 standard

Author: Song, Yusheng, Cao, Sheng, Wang, Yijie, Chen, Mingyan, Zhang, Yu, Li, Qiuyan, Han, Shulin, Liang, Yi, Cai, Lei, Zhao, Jialong, Zou, Bingsuo

Issue&Volume: 2025-09-22

Abstract: Colloidally quantum-confined CsPbBr3 nanoplatelets (NPLs) exhibit narrow emission linewidths and thickness-tunable photoluminescence, making them ideal candidates for deep-blue perovskite light-emitting diodes (PeLEDs). However, the weak surface coordination of conventional long-chain ligands (e.g., oleylamine and oleic acid) leads to face-to-face stacking of the NPLs, resulting in undesirable emission redshifts in their PeLEDs. Herein, we report an efficient deep-blue PeLED based on colloidal CsPbBr3 NPLs that meet the Rec.2020 color standard, enabled by an acid-assisted ligand passivation strategy. Surface chemical analysis reveals that hydrobromic acid facilitates proton-assisted stripping of the long-chain ligands, followed by the formation of stable Pb-S-P coordination bonds with thio-tributylphosphine, which exhibits a high adsorption energy (Eads=-1.13eV). This approach significantly improves surface defect passivation, yielding a photoluminescence quantum yield of 96% and a narrow 13nm full-width-at-half-maximum deep-blue emission. Enhanced exciton recombination and reduced defect state density are evidenced by a prolonged photoluminescence lifetime and slower absorption bleach recovery kinetics. The resulting PeLEDs achieve record-breaking performance among CsPbBr3 NPL-based systems, with a maximum external quantum efficiency of 6.81% at 461nm, a peak luminance of 143cdm-2, and the CIE color coordinates (CIE-y=0.046) that comply with Rec.2020 standards. This work presents an effective strategy for developing efficient and stable deep-blue perovskite emitters, demonstrating significant potential for the commercialization of perovskite nanomaterials in next-generation ultra-high-definition displays.

DOI: 10.1038/s41377-025-02019-1

Source: https://www.nature.com/articles/s41377-025-02019-1