作者：Hao Zhang, Jiang Chen, Tiantian Zhu, Rui Wang, Xuemei Wang, Xijun Xu, Jianli Wang
关键字：perovskite nanocrystal，CsPbBr3，quantum confinement，luminescent efficiency，stability
论文来源：期刊
具体来源：Nano Research
发表时间：2025年

量子限域CsPbBr3纳米晶作为高性能蓝绿光发射体，在先进照明与显示技术中展现出独特优势，但其实际应用受限于低发光效率、色纯度不足及由尺寸不均一性与高表面缺陷密度引发的稳定性问题。本研究提出一种基于3-氨基丙基三乙氧基硅烷（APTES）与聚甲基氢硅氧烷（PMHS）的后合成化学剪裁-原位封装协同策略，成功制备出具有显著量子限域效应的稳定CsPbBr3纳米晶。机理研究表明：APTES可作为化学剪刀将绿光发射的CsPbBr3母体（9.8 nm）高效剪裁至小尺寸纳米晶（3.9–7.9 nm），同时通过A位掺杂实现表面缺陷钝化；而APTES与PMHS的交联作用不仅抑制合成过程中的相变，更形成包覆量子限域CsPbBr3的聚合物隔离网络。所获复合材料展现出517–461 nm连续可调的发射光谱、约15 nm的窄发射线宽及超过80%的量子产率。将其应用于白光LED填补"青光缺失"后，显色指数由77.7显著提升至86.4。该工作为开发高亮度、高稳定性的量子限域钙钛矿材料提供了新范式。

Quantum-confined CsPbBr3 nanocrystals are promising cyan/blue-emitting materials with exceptional potential for advanced lighting and display technologies. However, their practical application is often limited by low luminescent efficiency, undesirable color purity and instability stemming from inadequate size uniformity, and high surface defect density. Here, we propose a post-synthetic chemical cutting and in-situ encapsulation approach using 3-aminopropyltriethoxysilane (APTES) combined with polymethylhydrosiloxane (PMHS) to synthesize and stabilize CsPbBr3 nanocrystals with significant quantum confinement. APTES can function as a chemical scissor efficiently cutting the green emitting CsPbBr3 (9.8 nm) to smaller counterparts (3.9–7.9 nm), while also passivating surface defects through A-site doping. Crosslinking between APTES and PMHS prevents phase transformation during synthesis and forms a polymeric network that encapsulates and separates the quantum confined CsPbBr3. The resulting composites exhibit tunable emission from 517 to 461 nm, a narrow linewidth of approximately 15 nm, and quantum yields over 80%. Moreover, incorporating one CsPbBr3 composite into a white light-emitting diode to fill the “cyan gap” significantly enhances the color rendering index from 77.7 to 86.4. This work provides an effective strategy for developing bright and stable quantum-confined CsPbBr3 for advanced lighting applications.

国家自然科学基金(资助号:22109138、22178317)资助。