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Luminescence of CsPbBr3-like quantum dots in CsBr single crystals |
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| Authors: | M Nikl K Nitsch E Mihkov K Polk P Fabeni G P Pazzi M Gurioli S Santucci R Phani A Scacco F Somma |
| Institution: | a Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Prague 6, Czech Republic;b IROE del CNR, Via Panciatichi 64, 50127 Firenze, Italy;c INFM-LENS, Largo E. Fermi 2, 50125 Firenze, Italy;d Department of Physics and UdR INFM, Via Vetoio 10, University of L'Aguilla, 67100 L'Aquilla, Italy;e Department of Physics, University of Rome “La Sapienza”, P. le A. Moro 2, Roma, Italy;f Department of Physics and UdR INFM, University of Rome III., Via della Vasca Navale 84, 00146 Roma, Italy;g Department of Materials Science, University of Milan, Via Cozzi 53, 20125 Milano, Italy |
| Abstract: | Luminescence and decay kinetics of the Pb2+ aggregates in CsBr host crystals were measured in the 4–300 K temperature interval and in 10−10–10−3 time scale. Their emission properties are similar to those of CsPbBr3 bulk crystal showing a subnanosecond free exciton emission in the 520–540 nm spectral region and slower trapped exciton emission in the 530–580 nm spectral region. An efficient energy exchange between the free and trapped exciton states is shown by the temperature dependencies of emission spectra. The quantum size effect is demonstrated in the high energy shift and broadening of the absorption and emission spectra and an estimate of the size of the CsPbBr3-like aggregates is provided. Independent evidence of the presence of the CsPbBr3 and Cs4PbBr6 aggregated phases in the CsBr host was obtained by X-ray structural studies. |
| Keywords: | CsPbBr3 Quantum dots Photoluminescence |
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