Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films
Abstract
:1. Introduction
2. Results
- The peak intensity slightly increases (about 13%) (see inset of Figure 4a).
- The two faster decay times remain essentially unchanged ( 1.9 ns and 11.5 ns), while a clear increase of the longest decay time from about 70 ns to about 100 ns is observed.
- The pre-exponential amplitude of the fastest process A1 slightly decreases (about 4%), while the amplitudes A2 and A3 increase of about 40% and 36%, respectively.
- The peak intensity increases of about 2 times (see inset of Figure 4b).
- A clear increase of the two faster decay times is observed ( from 1.2 to about 2.0 ns and from about 7.5 to about 9.8 ns), while the slowest time remains basically constant at about 65 ns.
- All the pre-exponential amplitudes clearly increase of about 1.9, 4.3, and 3.9 times for A1, A2, and A3, respectively.
3. Discussion
4. Materials and Methods
4.1. Synthesis of NCs
4.2. Samples Preparation and Characterization
4.3. PL and Time Resolved PL Measurements
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | E1 (eV) | FWHM1 (meV) | A1 | E2 (eV) | FWHM2 (meV) | A2 |
---|---|---|---|---|---|---|
#F V | 2.3873 ± 0.0009 | 149 ± 2 | 0.913 ± 0.018 | 2.405 ± 0.002 | 50 ± 6 | 0.087 ± 0.017 |
#F WA | 2.3705 ± 0.0005 | 134.4 ± 0.9 | 1.209 ± 0.010 | 2.3939 ± 0.0009 | 43 ± 3 | 0.91 ± 0.09 |
#A V | 2.3720 ± 0.0003 | 125.1 ± 0.5 | 0.903 ± 0.005 | 2.3955 ± 0.0004 | 44.5 ± 1.3 | 0.097 ± 0.004 |
#A WA | 2.3650 ± 0.0004 | 116.1 ± 0.6 | 2.64 ± 0.02 | 2.3901 ± 0.0008 | 40 ± 3 | 0.163 ± 0.016 |
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Anni, M.; Cretì, A.; Zhang, Y.; De Giorgi, M.L.; Lomascolo, M. Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films. Appl. Sci. 2020, 10, 2148. https://doi.org/10.3390/app10062148
Anni M, Cretì A, Zhang Y, De Giorgi ML, Lomascolo M. Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films. Applied Sciences. 2020; 10(6):2148. https://doi.org/10.3390/app10062148
Chicago/Turabian StyleAnni, Marco, Arianna Cretì, Yuhai Zhang, Maria Luisa De Giorgi, and Mauro Lomascolo. 2020. "Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films" Applied Sciences 10, no. 6: 2148. https://doi.org/10.3390/app10062148