Stable room-temperature continuous-wave lasing in quasi-2D perovskite films

Organic–inorganic lead halide quasi-two-dimensional (2D) perovskites are promising gain media for lasing applications because of their low cost, tunable colour, excellent stability and solution processability 1 – 3 . Optically pumped continuous-wave (CW) lasing is highly desired for practical applic...

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Bibliographic Details
Published in:Nature (London) 2020-09, Vol.585 (7823), p.53-57
Main Authors: Qin, Chuanjiang, Sandanayaka, Atula S. D., Zhao, Chenyang, Matsushima, Toshinori, Zhang, Dezhong, Fujihara, Takashi, Adachi, Chihaya
Format: Article
Language:English
Subjects:
142/126
639/301
639/624
Air temperature
Cations
Continuous radiation
Energy
Excitons
Humanities and Social Sciences
Lasers
Lasing
Lead compounds
Metal halides
multidisciplinary
Nitrogen
Optical pumping
Optoelectronics
Perovskites
Population inversion
Q factors
Room temperature
Science
Science (multidisciplinary)
Spontaneous emission
Temperature
Triplets
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Summary:Organic–inorganic lead halide quasi-two-dimensional (2D) perovskites are promising gain media for lasing applications because of their low cost, tunable colour, excellent stability and solution processability 1 – 3 . Optically pumped continuous-wave (CW) lasing is highly desired for practical applications in high-density integrated optoelectronics devices and constitutes a key step towards electrically pumped lasers 4 – 6 . However, CW lasing has not yet been realized at room temperature because of the ‘lasing death’ phenomenon (the abrupt termination of lasing under CW optical pumping), the cause of which remains unknown. Here we study lead halide-based quasi-2D perovskite films with different organic cations and observe that long-lived triplet excitons considerably impede population inversion during amplified spontaneous emission and optically pumped pulsed and CW lasing. Our results indicate that singlet–triplet exciton annihilation is a possible intrinsic mechanism causing lasing death. By using a distributed-feedback cavity with a high quality factor and applying triplet management strategies, we achieve stable green quasi-2D perovskite lasers under CW optical pumping in air at room temperature. We expect that our findings will pave the way to the realization of future current-injection perovskite lasers. Lead halide-based quasi-two-dimensional perovskite films with different organic cations are used to create stable green lasers under continuous-wave optical pumping in air at room temperature.
ISSN:0028-0836
1476-4687
DOI:10.1038/s41586-020-2621-1