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High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites
Author(s) -
Yang Jie,
Liu Zhengzheng,
Pi Mingyu,
Lin Hao,
Zeng Fanju,
Bian Yao,
Shi Tongchao,
Du Juan,
Leng Yuxin,
Tang Xiaosheng
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202000290
Subject(s) - formamidinium , lasing threshold , materials science , optoelectronics , laser , optics , halide , wavelength , physics , inorganic chemistry , chemistry
Formamidinium (HC(NH 2 ) + ; FA) lead halide perovskites have emerged as potential candidates for solar cells, light‐emitting diodes, and lasing applications. However, the severely poor photostability of this material under UV irradiation seriously restricts the application on optoelectronic devices. In this paper, formamidinium lead halide (FAPbX 3 ) quantum dots (QDs) adhered uniformly on the surface of amino‐mediated silica (A‐SiO 2 ) spheres are successfully synthesized using a facile ligand‐assisted reprecipitation (LARP) method. Amazingly, the FAPbBr 3 /A‐SiO 2 composites demonstrate excellent photostability after continuous illumination under UV lamps due to the effective suppression of the interactions and mutual contact between FAPbBr 3 particles. In addition, the up‐conversion random lasing with a high quality (Q) factor of 1307 and low threshold of 413.7 µJ cm ‐2 is successfully achieved from the FAPbBr 3 /A‐SiO 2 composites at room‐temperature, which originates from the multiple random scattering of light and photon recycling provided by the silica spheres and the high gain characteristic of FAPbBr 3 QDs. Moreover, different from regular lasers, random lasing does not rely on a laser cavity, which is promising in angle‐unlimited optical performance and easy/low‐cost fabrication. This work will open the window of high‐performance random lasers for digital light projector, high speed imaging, and speckle‐free full‐field imaging application.