Research
| Title： | Enhanced Stability and Luminescence Efficiency of CsPbBr3 PQDs via In Situ Growth and SiO2 Encapsulation in Surface-Functionalized Mesoporous Silica Nanospheres |
|---|---|
| First author： | Zhang, Qi; Wang, Xiaoqian; Que, Jiaqian; He, Jiazhen; Peng, Chong; Jiao, Yanhui; Zhao, Dafu; Liu, Damin; Li, Hang; Tang, Zisheng; Liu, Chengqi; Liu, Manrui; Song, Kang; Zhao, Dongyuan; Liu, Yong |
| Journal： | SMALL |
| Years： | 2025 |
| DOI： | 10.1002/smll.202412581 |
| Abstract： | All-inorganic perovskite quantum dots (PQDs) have garnered significant attention for optoelectronic applications due to their high photoluminescence quantum yield (PLQY), narrow emission linewidths, and tunable bandgaps. However, their inherent instability under environmental conditions and susceptibility to surface defects limit their practical use. In this study, surface-functionalized mesoporous silica nanospheres (s-MSNs) are employed as substrates for the in situ nucleation and growth of CsPbBr3 PQDs within their open pores, achieving a high PQDs loading of up to 28.3%. To further enhance stability and fluorescence efficiency, the composites are encapsulated with an additional SiO2 shell via hydrolysis of a silicon precursor, forming CsPbBr3/s-MSNs@SiO2 core-shell nanostructures. The SiO2 shell not only effectively shields the PQDs from environmental factors-preventing degradation, leakage and aggregation-but also passivates surface defects and promotes efficient radiative recombination, leading to a significant improvement in luminescence efficiency. Consequently, the CsPbBr3/s-MSNs@SiO2 composites exhibit enhanced stability and achieve a high PLQY of 90.0%, enabling their sufficient use in anti-counterfeiting applications. This encapsulation strategy offers a promising route to improve the reliability, efficiency, and longevity of PQDs-based optoelectronic devices. |
