Recently, the State Key Laboratory of Strong Field Laser Physics at the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences has cooperated with Chongqing University to make new progress in the research of zero-dimensional perovskite Cs4PbBr6 micro-nano laser. Related research results were published in the back cover article [Solar RRL, 2019, DOI: 10.1002 / solr.201900127].
Perovskite materials have excellent optical properties, such as high carrier migration rate, long diffusion length, large absorption coefficient, high quantum efficiency, etc., not only in photovoltaics, but also in micro-nano lasers and light-emitting diodes. Has a wide range of applications. Compared with the traditional three-dimensional lead-halogen perovskite ABX3, the perovskite with zero-dimensional structure has larger exciton binding energy, higher quantum yield and unique and excellent optical properties, and has broad application prospects in the field of optoelectronics. . However, its luminescence mechanism is still controversial.
In this work, the researchers used the femtosecond transient absorption measurement to study the photophysical properties of zero-dimensional perovskite Cs4PbBr6, revealing the existence of polarons in Cs4PbBr6, which provides green fluorescence. Evidence of CsPbBr3 impurities. In addition, the research team prepared CsPbBr6 perovskite microplates by the inverse microemulsion method at room temperature, and successfully realized a light-pumped single-mode laser with a low threshold and high quality factor, which also has excellent stability when exposed to air. It was also found that the phase change between CsPbBr3 and Cs4PbBr6 can be easily achieved by adjusting the dose of surfactant. The research shows that zero-dimensional perovskite has huge application potential in the field of nano-laser.
The research was supported by the B category pilot project of the Chinese Academy of Sciences, the National Key R & D Program-Intergovernmental International Science and Technology Innovation Cooperation Special Project, and the National Natural Science Foundation of China.
(A) Cs 4 PbBr 6 crystal structure. (B) Transient absorption spectrum. (C) SEM topography. (d) Single-mode laser.
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