期刊
RSC ADVANCES
卷 7, 期 57, 页码 35757-35764出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra06211g
关键词
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资金
- National Natural Science Foundation of China [11304058, 61204007, 11404307]
- NSAF [U1330106]
- Fundamental Research Funds for the central Universities and Program for Innovation Research of Science in Harbin Institute of Technology [201621]
- New-Century Training Programme Foundation for the Talents by Heilongjiang Province [1254-NCET-018]
- Foundation for University Key Teacher by Heilongjiang Province [1252G047]
- Heilongjiang Province Postdoctoral Science Foundation [LBH-Q14139]
- Science Foundation of Heilongjiang University for Young Scholars [JCL201205]
The luminescent characteristics of CsPbBr3 nanocrystals in n-hexane are investigated by the use of steadystate/time-resolved photoluminescence and transient absorption spectroscopy. Compared with normal luminescence, a redshift of the upconversion luminescence (UCL) spectrum under 800 nm femtosecond laser excitation is observed. Time-resolved PL and TA spectroscopy under near-infrared femtosecond laser excitation demonstrate that the full width at half maximum and peak position are changed at various delay times, suggesting the existence of more than a single excited state. It is found that UCL is composed of a photoinduced surface-trapping and a band-edge excitonic state, causing the observed biexponential dynamics. We conclude that the redshift of the emission peak is caused by the relative change in luminescent intensity between excitonic and trapping states.
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