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Effect of Pb2+ on the Luminescent Performance of Borosilicate Glass Coated CsPbBr3 Perovskite Quantum Dots
Zihao YUE, Xiaotu YANG, Zhengliang ZHANG, Ruixiang DENG, Tao ZHANG, Lixin SONG
J Inorg Mat ›› 2024, Vol. 39 ›› Issue (4) : 449-456.
PDF(1894 KB)
PDF(1894 KB)
Effect of Pb2+ on the Luminescent Performance of Borosilicate Glass Coated CsPbBr3 Perovskite Quantum Dots
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.
CsPbBr3 / Pb2+ / LED / quantum dot / borosilicate glass
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Semiconductor quantum dots have long been considered artificial atoms, but despite the overarching analogies in the strong energy-level quantization and the single-photon emission capability, their emission spectrum is far broader than typical atomic emission lines. Here, by using ab-initio molecular dynamics for simulating exciton-surface-phonon interactions in structurally dynamic CsPbBr3 quantum dots, followed by single quantum dot optical spectroscopy, we demonstrate that emission line-broadening in these quantum dots is primarily governed by the coupling of excitons to low-energy surface phonons. Mild adjustments of the surface chemical composition allow for attaining much smaller emission linewidths of 35−65 meV (vs. initial values of 70–120 meV), which are on par with the best values known for structurally rigid, colloidal II-VI quantum dots (20−60 meV). Ultra-narrow emission at room-temperature is desired for conventional light-emitting devices and paramount for emerging quantum light sources.
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Functional nanocomposites fabricated by growing CsPbBr3 perovskite QDs within Fe-doped zeolite X with improved stability for sensitive NH3 detection.
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The authors acknowledge funding sponsored by the Hengdian Group Holding Co., LTD. This research work was supported by the joint fund from Hengdian Group and Shanghai Institute of Ceramics, Chinese Academy of Sciences.
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