Engineering CsPbX3 (X = Cl, Br, I) Quantum Dot-Embedded Borosilicate Glass through Self-Crystallization Facilitated by NaF as a Phosphor for Full-Color Illumination and Laser-Driven Projection Displays

Junhao Li; Dacheng Zhou; Ying Liu; Yan Chen; Jiayuan Chen; Yong Yang; Yuan Gao; Jianbei Qiu

doi:10.1021/acsami.3c01484

Engineering CsPbX₃ (X = Cl, Br, I) Quantum Dot-Embedded Borosilicate Glass through Self-Crystallization Facilitated by NaF as a Phosphor for Full-Color Illumination and Laser-Driven Projection Displays

ACS Appl Mater Interfaces. 2023 May 10;15(18):22219-22230. doi: 10.1021/acsami.3c01484. Epub 2023 Apr 28.

Authors

Junhao Li¹, Dacheng Zhou^{1

2}, Ying Liu¹, Yan Chen¹, Jiayuan Chen¹, Yong Yang^{1

2}, Yuan Gao^{1

2}, Jianbei Qiu^{1

2}

Affiliations

¹ Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
² Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China.

PMID: 37115516
DOI: 10.1021/acsami.3c01484

Abstract

All inorganic perovskite (CsPbX₃, X = Cl, Br, I) quantum dot (QD) glass samples are considered the next generation of lighting materials for their excellent luminescence properties and stability, but crystallization conditions are difficult to control, which often leads to the inhomogeneous crystallinity of QDs. Here, we provided evidence that the presence of sodium fluoride induced self-crystallization of CsPbBr₃ QDs during routine glass formation without the need for additional heat treatment. We showed that NaF simultaneously affected the network structure of glass and promoted the formation of CsPbBr₃ QDs, that is, Na⁺ ions entered the glass network skeleton, partially interrupting the network structure, while the strong electronegativity of F^- ions attracted Cs⁺ and Pb²⁺ ions into the gaps formed in the glass networks that had been loosened up by Na⁺ ions, which reduced the activation energy of crystallization processes. Our results showed that NaF-induced CsPbBr₃ QDs glass had excellent thermal stability, high photoluminescence quantum efficiency (49%), and luminescent stability under high-power laser irradiation. Finally, this work also demonstrated the general applicability of this method in the making of a series of CsPbX₃ (X = Cl, Br, I) QD glass samples by NaF-induced self-crystallization, which drastically expanded the color gamut to a range of full spectrum for luminescence and laser-driven projection displays. We believe that the work presented here represents a new direction for the research and development of full-color gamut inorganic perovskite quantum dot glass samples, which could have a significant impact on the future applications of laser-driven projection displays as well.

Keywords: NaF-induced self-crystallization; borosilicate glass network; full-color gamut illumination; inorganic perovskite quantum dot; laser-driven projection display.