Preparation and luminescent performances of tellurite glass coated CsPbBr3@glass film for remote LED color converter

• Published in: Journal of luminescence 2023-05, Vol.257, p.119681, Article 119681
• Main Authors: Zhang, Huanhuan, Ou, Jialing, Zhao, Guoying, Hou, Jingshan, Liu, Yufeng, Qiao, Xin, Wang, Zhongzhi, Li, Ji-Guang, Fang, Yongzheng
• Format: Article
• Language: English
• Subjects: CsPbBr3 perovskite quantum dot; Double encapsulation; High quantum yield; Remote glass film
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2023.119681

We know that perovskite quantum dot (PQD) glass is one of the effective ways to achieve high stability, high reliability and high weather resistance. However, quantum dot glass is still unable to achieve completely uniform crystallization as a whole, so quantum dot glass has to be used in the form of powder by mixing glue. The use of organic matter leads to the problems of heat accumulation and stability. In this work, the concept of double cladding encapsulation was realized to solve the above problems in the application of quantum dot glass, and the remote inorganic fluorescent film is prepared. CsPbBr3 PQDs embedded in borosilicate glass (PQDs@glass) were prepared using traditional melting-quenching and heat-treatment processes. By optimizing the raw material composition and melting conditions, excellent PQDs@glass were obtained, and its photoluminescence quantum yield (PLQY) was as high as 88.06%. The CsPbBr3 PQDs embedded borosilicate glass has been dispersed in tellurite glass film again along with color-compensatory red-emitting nitride phosphor, which is a doubly encapsulated system with inorganic glass matrixes to improve stability and color-tunability. A series of prototypes light-emitting diode devices were assembled based on the as-made doubly encapsulated glass film with a commercial blue chip, resulting in bright white light luminescence at a color temperature of 3920 K and a high color rendering index of 87.2. •A double-coated CsPbBr3 PQDs embedded inorganic remote fluorescent glass film is suggested and prepared.•The PLQY of CsPbBr3 PQDs reached 88.06%.•A warm white light with a color temperature of 3920 K and a color rendering index of 87.2 was obtained.