Thermal imaging by utilization of CsPbBr3 quantum dot photoluminescence

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 changes of traces on a printed circuit board are visualized as proof of principle. This technique enables an advanced approach for thermal imaging of arbitrary samples with optical resolution (wavelength of ∼500 nm), instead of typical black-body wavelengths (∼10 μm). Premature degradation of the quantum dots has been mitigated by embedding them in a poly-methyl methacrylate film, which can then be applied to arbitrary surfaces.