Peculiarities of photoinduced heating of perovskite nanocrystals with effective anti-Stokes photoluminescence under near-resonant laser excitation
Pokryshkin N. S.1,2, Sobina I. O.2, Knysh A. A.1, Eremina A. S.1, Syuy A. V.3, Yakunin V. G.2, Timoshenko V. Yu.2
1National Research Nuclear University “MEPhI”, Moscow, Russia
2Department of Physics, Lomonosov Moscow State University, Moscow, Russia
3Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudnyi, Russia
Email: pokryshkin.nikolay@mail.ru, knyshkikai@mail.ru
The optical properties of a photoluminescent material based on CsPbBr3 perovskite nanocrystals were studied in this work. The laser heating of the obtained samples was studied under three different regimes of laser excitation: the photoluminescence band appears in the Stokes region, in the anti-Stokes region, and coincides with the excitation line. It was found that under laser excitation of a certain wavelength, this material is able to demonstrate predominantly anti-Stokes (upconversion) photoluminescence. A method is proposed for estimating the PL quantum yield from data on absorption, photoheating, and the position of the photoluminescence band of a sample at two different wavelengths. The external photoluminescence quantum yield of CsPbBr3 nanocrystals was experimentally determined to be 91±4%. The results of this work can be useful for the development of optical cooling technology and can be used in the development of laser devices based on perovskite materials. Keywords: perovskite nanocrystals, upconversion photoluminescence, quantum yield, laser heating.
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Дата начала обработки статистических данных - 27 января 2016 г.