Author(s): Shang, QY (Shang, Qiuyu); Li, ML (Li, Meili); Zhao, LY (Zhao, Liyun); Chen, DW (Chen, Dingwei); Zhang, S (Zhang, Shuai); Chen, SL (Chen, Shulin); Gao, P (Gao, Peng); Shen, C (Shen, Chao); Xing, J (Xing, Jun); Xing, GC (Xing, Guichuan); Shen, B (Shen, Bo); Liu, XF (Liu, Xinfeng); Zhang, Q (Zhang, Qing)

Source: NANO LETTERS Volume: 20 Issue: 9 Pages: 6636-6643 DOI: 10.1021/acs.nanolett.0c02462 Published: SEP 9 2020

Abstract: Lead halide perovskites have emerged as excellent optical gain materials for solution-processable and flexible lasers. Recently, continuous-wave (CW) optically driven lasing was established in perovskite crystals; however, the mechanism of low-threshold operation is still disputed. In this study, CW-pumped lasing from one-dimensional CsPbBr3 nanoribbons (NBs) with a threshold of similar to 130 W cm(-2) is demonstrated, which can be ascribed to the large refractive index induced by the excitonpolariton (EP) effect. Increasing the temperature reduces the exciton fraction of EPs, which decreases the group and phase refractive indices and inhibits lasing above 100 K. Thermal management, including reducing the NB height to similar to 120 +/- 60 nm and adopting a high-thermal-conductivity sink, e.g., sapphire, is critical for CW-driven lasing, even at cryogenic temperatures. These results reveal the nature of ultralow-threshold lasing with CsPbBr3 and provide insights into the construction of room-temperature CW and electrically driven perovskite macro/microlasers.

Accession Number: WOS:000571442000053

PubMed ID: 32786951

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

, Peng                  0000-0003-0860-5525

Shen, Chao         J-1406-2017         0000-0002-3664-4874

ISSN: 1530-6984

eISSN: 1530-6992

Full Text: https://pubs.acs.org/doi/10.1021/acs.nanolett.0c02462