期刊
CHEMISTRY OF MATERIALS
卷 33, 期 18, 页码 7185-7193出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c00591
关键词
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资金
- Basic Science Research Programs through the National Research Foundation of Korea (NRF) - Korean government [2019R1A2C3006189, 2017R1D1A1B03035539, 2020R1F1A1069646, 2021R1A2C2013625]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF) - Korean government [2019R1A6A1A11053838]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOITE, Korea) [20009803]
- US Department of Energy, Office of Science, Basic Energy Sciences [SC0012541]
- National Research Foundation of Korea [2021R1A2C2013625, 2020R1F1A1069646] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Bulk CsPbBr3 single crystals exhibit highly efficient amplified spontaneous emission with a threshold of 46 MWcm(-2) at 520 nm, when properly suppressing photoluminescence reabsorption via the indirect Rashba gap. Thin CsPbBr3 single crystals engineered into submillimeter thickness can be utilized for lasing applications.
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.
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