Thermal stable zinc-based hybrid halides with high external quantum efficiency as temperature detectors

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-09, Vol.1 (36), p.13137-13142
• Main Authors: Zhang, Xusheng, Xiong, Yan, Liu, Kunjie, Wang, Na, Fan, Liubing, Li, Weiwei, Zhao, Xiaobin, Zhao, Jing, Liu, Quanlin
• Format: Article
• Language: English
• Subjects: Commercialization; Fluorescence; Halides; Light emission; Low temperature; Metal halides; Phosphors; Photoluminescence; Quantum efficiency; Room temperature; Temperature; Thermal stability; Zinc
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d2tc02838g

Low-dimensional organic-inorganic metal halides with broad light emission have drawn widespread attention, however, the low thermal stability has been a major obstacle to their commercialization. Herein, zero-dimensional (C 9 H 15 N 3 )ZnCl 4 with space group P 2 1 was synthesized for the first time. (C 9 H 15 N 3 )ZnCl 4 emits blue fluorescence at room temperature with external quantum efficiency as high as 42.5%, which are among the highest reported for Zn-based OIMHs, and it is comparable with the commercialized phosphors. Notably, the luminous integral intensity of (C 9 H 15 N 3 )ZnCl 4 at 470 K remains more than 50% of that at room temperature. Mn 2+ doping of (C 9 H 15 N 3 )ZnCl 4 was conducted to improve the photoluminescence. With increasing Mn 2+ concentration, the title compounds underwent fluorescence conversion from blue to green. The external quantum efficiencies of (C 9 H 15 N 3 )ZnCl 4  : 5%Mn 2+ and (C 9 H 15 N 3 )ZnCl 4  : 50%Mn 2+ were 43.7% and 42.9%, respectively. More importantly, (C 9 H 15 N 3 )ZnCl 4  : 5%Mn 2+ exhibited different luminous colors at different temperatures. As the temperature decreased from 290 to 110 K, the luminous color changed from green to light blue. Finally, a composite film was prepared to demonstrate the temperature response of this material, and the absolute sensitivity reaches 0.57%/K. These findings fill in the gaps for low-temperature indication and expand the application scenarios of OIMHs. (C 9 H 15 N 3 )ZnCl 4 with a very high external quantum efficiency and thermal quenching temperature was obtained. (C 9 H 15 N 3 )ZnCl 4  : Mn 2+ (5%) exhibited photoluminescence response, which may be applied as low temperature detectors.