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Article

Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films

1
Dipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, Via per Arnesano, 73100 Lecce, Italy
2
IMM-CNR Institute for Microelectronic and Microsystems, Via per Monteroni, 73100 Lecce, Italy
3
KAUST Solar Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
*
Author to whom correspondence should be addressed.
Current address: Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan 250022, China.
Appl. Sci. 2020, 10(6), 2148; https://doi.org/10.3390/app10062148
Received: 28 February 2020 / Revised: 17 March 2020 / Accepted: 18 March 2020 / Published: 21 March 2020
In this work, we present a detailed optical investigation of the effects of the environment on the photoluminescence (PL) spectra and the relaxation dynamics of pristine and aged CsPbBr3 nanocrystal (NC) thin films. We demonstrate that, contrary to previous results on similar NCs, the PL intensity of pristine NCs is higher when the sample is in wet air than in vacuum, due to the passivation of defects reducing the free exciton trapping and the bound excitons non-radiative relaxation. The aged NCs show a PL intensity increase in wet air nine times stronger than the pristine ones, due to an interplay between static and dynamic effects, increasing the number of emitting NCs and reducing the non-radiative recombination rate of free excitons. These results improve the understanding of the possible interactions between perovskite NCs and the environment, which could be relevant for the development of optical gas sensors exploiting perovskite NCs. View Full-Text
Keywords: lead halide perovskites; nanocrystals; photoluminescence; time resolved photoluminescence; gas sensors lead halide perovskites; nanocrystals; photoluminescence; time resolved photoluminescence; gas sensors
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MDPI and ACS Style

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

AMA Style

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 Style

Anni, Marco, Arianna Cretì, Yuhai Zhang, Maria L. 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

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