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Title: On the Origin of Room-Temperature Amplified Spontaneous Emission in CsPbBr3 Single Crystals

Journal Article · · Chemistry of Materials

CsPbBr3 is an all-inorganic halide perovskite with excellent photoluminescence (PL) properties for laser applications. Amplified spontaneous emission (ASE) is a prerequisite for lasing and typically observed from low-dimensional CsPbBr3 nanostructures, where quantum confinement enhances ASE. However, a gain medium for lasing should be prepared into a robust bulk form that works under intense light illumination. Here, we demonstrate that bulk CsPbBr3 single crystals exhibit highly efficient ASE with a threshold of 46 MWcm-2 at 520 nm, if PL reabsorption via the indirect Rashba gap is properly suppressed by thickness control. Based on a series of spectroscopic and microscopic measurements, we show that this below-the-gap absorption can significantly alter the PL feature and even the apparent color of the crystal depending on the crystal size. Our results show that a thin CsPbBr3 single crystal can be utilized for lasing applications when engineered into a submillimeter thickness for effective light–matter interaction.

Research Organization:
Univ. of California, Santa Barbara, CA (United States); Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF); Ministry of Trade, Industry and Energy (MOITE)
Grant/Contract Number:
SC0012541
OSTI ID:
1870317
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 18 Vol. 33; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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