High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites. Issue 12 (20th April 2020)

• Record Type: Journal Article
• Authors: Yang, Jie; Liu, Zhengzheng; Pi, Mingyu; Lin, Hao; Zeng, Fanju; Bian, Yao; Shi, Tongchao; Du, Juan; Leng, Yuxin; Tang, Xiaosheng
• Is Part Of: Advanced optical materials. Volume 8:Issue 12(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-20
• Subjects: formamidinium perovskite -- lasing -- photostability -- quantum dots; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202000290
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Formamidinium (HC(NH2 ) + ; 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 (FAPbX3 ) quantum dots (QDs) adhered uniformly on the surface of amino‐mediated silica (A‐SiO2 ) spheres are successfully synthesized using a facile ligand‐assisted reprecipitation (LARP) method. Amazingly, the FAPbBr3 /A‐SiO2 composites demonstrate excellent photostability after continuous illumination under UV lamps due to the effective suppression of the interactions and mutual contact between FAPbBr3 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 FAPbBr3 /A‐SiO2 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 FAPbBr3 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. Abstract : FAPbBr3 /A‐SiO2 composites are successfully fabricated and demonstrated by combining materials synthesis, characterization, and optical measurements, which show ultrahigh photostability and high photoluminescence quantum yield. Benefiting from the strong scattering from SiO2 spheres and the high optical gain characteristic of FAPbBr3 quantum dots, random lasing with low lasing threshold and high‐quality factors have been realized from FAPbBr3 /A‐SiO2 composites under two‐photon excitation.