On the Origin of Room-Temperature Amplified Spontaneous Emission in CsPbBr3Single Crystals

Donggyu Kim, Hongsun Ryu, Soo Yeon Lim, Kyle M. McCall, Jongwoo Park, Sungdo Kim, Tae Jung Kim, Jeongyong Kim, Yong Soo Kim, Mercouri G. Kanatzidis, Hyeonsik Cheong, Joon I. Jang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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 languageEnglish (US)
Pages (from-to)7185-7193
Number of pages9
JournalChemistry of Materials
Issue number18
StatePublished - Sep 28 2021

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


Dive into the research topics of 'On the Origin of Room-Temperature Amplified Spontaneous Emission in CsPbBr3Single Crystals'. Together they form a unique fingerprint.

Cite this