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

Encapsulation of perovskite CsPbBr3 quantum dots (PQDs) within borosilicate glass markedly improves the stability of these PQDs, thereby expanding their applicability in sectors such as in the context of light emitting diode (LED) lighting and display. However, this encapsulation process within the glass has the unintended consequence of reducing both the photoluminescence (PL) intensity and photoluminescence quantum yields (PLQY) of the PQDs. This research elucidates the impact of thermal annealing temperature and Pb 2+ content on the structural characteristics of CsPbBr3 perovskite quantum dots embedded glass (PQDs@glass), leading to a remarkable amplification in the emission intensity and an impressive PLQY of up to 95.6% for PQDs@glass. Concurrently, this investigation has successfully accomplished precise size-controlled synthesis of perovskite quantum dots within a borosilicate glass matrix. The obtained results reveal a well-defined size distribution of PQDs, with an average diameter of approximately 10 nm. Remarkably, over 86% of the particles fall within the narrow size range of 6-14 nm. 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 ambient temperature to 200 . Finally, in order to verify its applicability in the domains of LED lighting and displays, the PQDs@glass powder obtained from this study was blended with polydimethylsiloxane (PDMS), yielding exemplary LED devices exhibiting an exceptional color gamut range surpassing 110% of the standard RGB (sRGB) color space. This lays the groundwork for the scalable synthesis of PQDs@glass and paves the way for its utilization in the realm of LED device technology.