Dual-phase Cs4PbBr6/CsPbBr3 perovskite quantum dot borosilicate glass for WLED applications

IF 3.3 3区物理与天体物理 Q2 OPTICS Journal of Luminescence Pub Date : 2024-10-22 DOI:10.1016/j.jlumin.2024.120953

Zhigang Yang, Shuqin Zhang, Junshuai Chen, Tianqing Sheng, Xinran Lv, Xuguang Wei, Guoqiang Qin, Gang Yu

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Abstract

Owing to inherent structural instability of perovskite quantum dots, they are instability in humid environments and high temperatures conditions. To address this issue, a simple, environmentally friendly glass encapsulated technology is used to protect the perovskite quantum dots. Meanwhile, the dual-phase perovskite structure realized by phase transition engineering can further increase the stability of perovskite quantum dots. In this study, 3D CsPbBr₃/0D Cs₄PbBr₆ dual-phase coexisting perovskite quantum dot glass powders were synthesized through melt quenching and subsequent crystallization induction of thermal treatment and water molecule, respectively. Results showed that compared with thermal treatment induction, perovskite QDs glass powders by water molecules induction exhibited a high PLQY of 24.7 % with a central wavelength of 519 nm and displayed excellent environmental stability. By combining green fluorescence from 3D CsPbBr₃/0D Cs₄PbBr₆ QDs glass powders and red fluorescence powders (CaAlSiN₃:Eu), a WLED device with an impressive EQE of 20.6 % was created, indicating a promising application potential.

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用于 WLED 应用的双相 Cs4PbBr6/CsPbBr3 包光体量子点硼硅玻璃

由于包光体量子点结构本身的不稳定性，它们在潮湿环境和高温条件下很不稳定。为解决这一问题，我们采用了一种简单、环保的玻璃封装技术来保护包光体量子点。同时，通过相变工程实现的双相包晶结构可以进一步提高包晶量子点的稳定性。本研究分别通过热处理和水分子的熔融淬火及随后的结晶诱导合成了三维 CsPbBr3/0D Cs4PbBr6 双相共存的包晶量子点玻璃粉。结果表明，与热处理诱导相比，水分子诱导的包晶量子点玻璃粉的中心波长为 519 nm，PLQY 高达 24.7%，并具有良好的环境稳定性。通过将三维 CsPbBr3/0D Cs4PbBr6 QDs 玻璃粉发出的绿色荧光与红色荧光粉（CaAlSiN3:Eu）相结合，创造出了一种 EQE 值高达 20.6% 的 WLED 器件，这表明该器件具有广阔的应用前景。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.