Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 23, Pages 7516-7522Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b03051
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Funding
- Macau Science and Technology Development Fund [FDCT-091/2017/A2, FDCT-014/2017/AMJ, FDCT/199/2017/A3]
- Start-up Research Grant Fund from University of Macau [SRG2016-00002-FST]
- Research and Development Grant for Chair Professor Fund from University of Macau [CPG2018-00026-FST]
- University of Macau [SRG2016-00087-FST, MYRG2018-00148-IAPME, MYRG2018-00142-IAPME]
- Natural Science Foundation of China [91733302, 61605073]
- Young 1000 Talents Global Recruitment Program of China
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ZnxCd1-xSe is regarded as a promising semiconducting material for optoelectronic devices. However, the tunable amplified spontaneous emission (ASE) properties and corresponding charge carrier recombination dynamics in ZnxCd1-xSe (0 <= x <= 1) nanowires (NWs) remain poorly understood. Herein, the charge carrier dynamics and ASE properties in ZnxCd1-xSe NWs were systematically investigated. In these NWs, the one/two-photon pumped ASE wavelength across the entire visible spectrum (480-725 nm) can be easily tuned via compositional engineering. The ASE threshold is closely related to the absorption coefficient and PL lifetime. At room temperature, free-carrier recombination is dominated in the low fluence pumped PL process. The ASE behavior is determined by exciton recombination in the high pump fluence (>10(18) cm(-3)) region. These findings uncover the origin of the tunable PL/ASE properties in ZnxCd1-xSe NWs and establish them as having practical application as a series of lasing gain materials.
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