Temperature Dependence of Photoluminescence and Calculation of Activation Energy for Thermal Quenching in Cspbbr₃ Perovskite

M. O.  Rahmonova; N. Q.  Mukhamadiev; Yu. G.  Galyametdinov

doi:10.51699/cajmns.v6i4.2981

Authors

M. O. Rahmonova Samarkand State University named after Sharof Rashidov, Uzbekistan
N. Q. Mukhamadiev Samarkand State University named after Sharof Rashidov, Uzbekistan
Yu. G. Galyametdinov Kazan National Research Technological University, Kazan, Russia

DOI:

https://doi.org/10.51699/cajmns.v6i4.2981

Keywords:

CsPbBr₃, photoluminescence, temperature, red shift, FWHM, activation energy, temperature decay

Abstract

This paper investigates the temperature dependence of the photoluminescence properties of inorganic perovskite CsPbBr₃. Nanoparticles were synthesized by a ligand-assisted method using CsBr and PbBr₂ as precursors, dimethyl sulfoxide as a solvent, and oleylamine and oleic acid as stabilizers. After purification by centrifugation with acetone, the samples were analyzed using a Shimadzu RF-6000 spectrofluorometer in the temperature range of 45–95 °C. With increasing temperature, the photoluminescence peak shifts from 448 nm (2.77 eV) at 45 °C to 567 nm (2.19 eV) at 95 °C. Simultaneously, the spectral line broadens from ~30 to ~40 nm (FWHM), and the emission intensity decreases by more than half. These changes result from band gap narrowing, enhanced electron–phonon coupling, and activation of defect states. The activation energy of non-radiative processes was calculated as Ea≈0.374 eV, consistent with literature data. The results clarify the mechanisms of thermal quenching in CsPbBr₃ and are relevant for perovskite-based optoelectronic devices.

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