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) |
---|---|
Pages (from-to) | 7185-7193 |
Number of pages | 9 |
Journal | Chemistry of Materials |
Volume | 33 |
Issue number | 18 |
DOIs | |
State | Published - Sep 28 2021 |
Funding
This work was supported by the Basic Science Research Programs (2019R1A2C3006189, 2017R1D1A1B03035539, 2020R1F1A1069646, and 2021R1A2C2013625) and the Priority Research Centers Program (2019R1A6A1A11053838) through the National Research Foundation of Korea (NRF), funded by the Korean government. Y.S.K. also thanks Technology Innovation Program (20009803), funded by the Ministry of Trade, Industry & Energy (MOITE, Korea). At the Northwestern University, this work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, under grant no. SC0012541 (synthesis and structural characterization).
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- Materials Chemistry