Abstract
CsPbBr3is 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 CsPbBr3nanostructures, 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 CsPbBr3single crystals exhibit highly efficient ASE with a threshold of 46 MWcm-2at 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 CsPbBr3single crystal can be utilized for lasing applications when engineered into a submillimeter thickness for effective light-matter interaction.
Original language | English (US) |
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Pages (from-to) | 7185-7193 |
Number of pages | 9 |
Journal | Chemistry of Materials |
Volume | 33 |
Issue number | 18 |
DOIs | |
State | Published - Sep 28 2021 |
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Chemistry