Journal of Inorganic Materials ›› 2024, Vol. 39 ›› Issue (4): 449-456.DOI: 10.15541/jim230501

Special Issue: 【能源环境】钙钛矿(202409)

• Research Letter • Previous Articles    

Effect of Pb2+ on the Luminescent Performance of Borosilicate Glass Coated CsPbBr3 Perovskite Quantum Dots

YUE Zihao1,2(), YANG Xiaotu1, ZHANG Zhengliang1, DENG Ruixiang1(), ZHANG Tao1(), SONG Lixin1,2   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Abstract:

Perovskite CsPbBr3 quantum dots (PQDs) encapsulated within borosilicate glass can markedly improve their stability, expanding their applicability in sectors under lighting and display of light emitting diode (LED). However, this encapsulation has unintended consequence of reducing both the photoluminescence (PL) intensity and PL quantum yields (PLQY). This research aims to enhance the PL intensity of CsPbBr3 perovskite quantum dots glass (PQDs@glass) by exploring the effects of thermal induction temperature and Pb2+ content on its structural properties. The results demonstrate that the optimal thermal induction temperature for maximizing PL intensity is 460 ℃, with a Pb2+ concentration of 6 mol. The study revealed that the increase in Pb2+ concentration led to the densification of the glass network structure and altered the diffusion behavior of glass components. This alteration affected the crystallization process of PQDs, which ultimately resulted in variations in the luminous intensity of PQDs@glass. This study achieved a highly desirable PLQY of 95.6% for PQDs@glass and successfully carried out size-controllable preparation of PQDs within a borosilicate glass matrix. Remarkably, the obtained results show that over 86% of the obtained PQDs particles fall within a narrow size range of 6-14 nm with average diameter of 10 nm, leading to a well-defined size distribution. Notably, these PQDs exhibit exceptional stability, as evidenced by their ability to retain an extraordinary 98.9% of the initial emission intensity following ten consecutive thermal cycles spanning from room temperature to 200 ℃. Finally, to verify its applicability in LED lighting and display, the obtained PQDs@glass powder was blended with polydimethylsiloxane (PDMS), yielding exemplary LED devices which exhibit an exceptional color gamut range surpassing 110% of the standard RGB (sRGB) color space. In conclusion, this study lays the groundwork for the scalable synthesis of PQDs@glass and paves the way for its utilization in the realm of LED device technology.

Key words: CsPbBr3, Pb2+, LED, quantum dot, borosilicate glass

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