Thermal imaging by utilization of CsPbBr3 quantum dot photoluminescence

TL;DR

This paper demonstrates a novel thermal imaging technique using CsPbBr3 quantum dot photoluminescence, enabling optical resolution thermal mapping with a consumer-grade camera, suitable for various surfaces and applications.

Contribution

It introduces a new method for thermal imaging based on quantum dot photoluminescence spectral shifts, using cost-effective equipment and embedding techniques to prevent degradation.

Findings

Effective temperature estimation via photoluminescence spectral shifts.

Thermal imaging demonstrated on PCB traces with optical resolution.

Quantum dots embedded in PMMA improve stability and applicability.

Abstract

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.