The temperature-dependent photoluminescence of perovskite quantum dots (CsPbBr3) in the visible band, is analyzed to evaluate their suitability for use in thermometry. A differential measurement of the photoluminescence can be used to estimate the surface temperature. Thermal imaging is demonstrated by using the Bayer-pattern of a cost-effective consumer-grade digital camera to determine the spectral shift. The temperature change of traces on a printed circuit board are visualized as proof of principle. This technique promises a novel approach for thermal imaging of arbitrary samples with optical resolution (wavelength of ~ 500 nm), instead of typical black-body wavelengths (~ 10 micrometer). Premature degradation of the quantum dots has been mitigated by embedding them in a poly-methyl methacrylate (PMMA) film, which can then be applied to arbitrary surfaces.
@article{arxiv.2508.08631,
title = {Thermal imaging by utilization of CsPbBr3 quantum dot photoluminescence},
author = {Alireza Jalouli and Nathan Giannini-Hutchin and Alexander R. Albrecht},
journal= {arXiv preprint arXiv:2508.08631},
year = {2025}
}