Bright and stable quantum confined CsPbBr3 nanocrystals through post-synthetic chemical cutting and in-situ encapsulation
作者：Hao Zhang, Jiang Chen, Tiantian Zhu, Rui Wang, Xuemei Wang, Xijun Xu, Jianli Wang
關鍵字：perovskite nanocrystal，CsPbBr3，quantum confinement，luminescent efficiency，stability
論文來源：期刊
具體來源：Nano Research
發表時間：2025年
量子限域CsPbBr3納米晶作為高性能藍綠光發射體，在先進照明與顯示技術中展現出獨特優勢，但其實際應用受限于低發光效率、色純度不足及由尺寸不均一性與高表面缺陷密度引發的穩定性問題。本研究提出一種基于3-氨基丙基三乙氧基硅烷（APTES）與聚甲基氫硅氧烷（PMHS）的后合成化學剪裁-原位封裝協同策略，成功制備出具有顯著量子限域效應的穩定CsPbBr3納米晶。機理研究表明：APTES可作為化學剪刀將綠光發射的CsPbBr3母體（9.8 nm）高效剪裁至小尺寸納米晶（3.9–7.9 nm），同時通過A位摻雜實現表面缺陷鈍化；而APTES與PMHS的交聯作用不僅抑制合成過程中的相變，更形成包覆量子限域CsPbBr3的聚合物隔離網絡。所獲復合材料展現出517–461 nm連續可調的發射光譜、約15 nm的窄發射線寬及超過80%的量子產率。將其應用于白光LED填補"青光缺失"后，顯色指數由77.7顯著提升至86.4。該工作為開發高亮度、高穩定性的量子限域鈣鈦礦材料提供了新范式。
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.
國家自然科學基金(資助號:22109138、22178317)資助。