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Room-Temperature Continuous-Wave Microcavity Lasers from Solution-Processed Smooth Quasi-2D Perovskite Films with Low
Xiang Gao1, Jie Lin2, Xiaoyang Guo3
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
The Journal of Physical Chemistry Letters
|March 3, 2023
Summary
Researchers developed continuous-wave (CW) microcavity lasers using low-roughness, solution-processed quasi-two-dimensional (2D) perovskite films. These room-temperature lasers demonstrate potential for future electrically pumped perovskite microcavity lasers.
Area of Science:
- Materials Science
- Optics and Photonics
- Solid State Physics
Background:
- Continuous-wave (CW) lasing in quasi-two-dimensional (2D) perovskite distributed feedback cavities is established.
- CW microcavity lasers with distributed Bragg reflectors (DBRs) using solution-processed quasi-2D perovskite films are challenging due to film roughness and scattering losses.
Purpose of the Study:
- To develop high-quality, solution-processed quasi-2D perovskite films for CW microcavity lasers.
- To investigate room-temperature CW lasing in quasi-2D perovskite microcavity lasers with DBRs.
Main Methods:
- High-quality spin-coated quasi-2D perovskite gain films were prepared using an antisolvent to minimize surface roughness.
- Highly reflective top DBR mirrors were deposited via room-temperature electron-beam evaporation to protect the perovskite layer.
Main Results:
- Continuous-wave (CW) lasing was achieved in the quasi-2D perovskite microcavity lasers at room temperature under optical pumping.
- The lasers exhibited a low threshold of approximately 1.4 W cm⁻² and a beam divergence of about 3.5°.
- Lasing originated from weakly coupled excitons.
Conclusions:
- Controlling the surface roughness of quasi-2D perovskite films is crucial for achieving efficient CW lasing.
- The developed method facilitates the design of future electrically pumped perovskite microcavity lasers.
