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(guān)鍵字：perovskite nanocrystal，CsPbBr3，quantum confinement，luminescent efficiency，stability
論文來源：期刊
具體來源：Nano Research
發(fā)表時(shí)間：2025年
量子限域CsPbBr3納米晶作為高性能藍(lán)綠光發(fā)射體，在先進(jìn)照明與顯示技術(shù)中展現(xiàn)出獨(dú)特優(yōu)勢，但其實(shí)際應(yīng)用受限于低發(fā)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(fā)的穩(wěn)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(xué)剪裁-原位封裝協(xié)同策略，成功制備出具有顯著量子限域效應(yīng)的穩(wěn)定CsPbBr3納米晶。機(jī)理研究表明：APTES可作為化學(xué)剪刀將綠光發(fā)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(shí)通過A位摻雜實(shí)現(xiàn)表面缺陷鈍化；而APTES與PMHS的交聯(lián)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(wǎng)絡(luò)。所獲復(fù)合材料展現(xiàn)出517–461 nm連續(xù)可調(diào)的發(fā)射光譜、約15 nm的窄發(fā)射線寬及超過80%的量子產(chǎn)率。將其應(yīng)用于白光LED填補(bǔ)"青光缺失"后，顯色指數(shù)由77.7顯著提升至86.4。該工作為開發(fā)高亮度、高穩(wěn)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(xué)基金(資助號(hào):22109138、22178317)資助。