Wydział Chemii

Y. Abe

M. Szymczak

J. Zeler

L. Marciniak

2026

Advanced Science

e75943/1-e75943/14

10.1002/advs.75943

Naukowa

Angielski

Artykuł

The shift from point-based thermal sensing to filter-free thermal imaging requires luminescent thermometers that exhibit pronounced and thermally driven spectral changes within spectral regions matching the sensitivity profiles of the red, green and blue (RGB) channels of a digital camera. In this work, we introduce such a system, enabled by the synergistic interplay between (i) thermal redistribution among the vibronic components of the ⁴T₁ excited state of Mn²⁺ ions and (ii) thermally assisted population of this state via optical trap sites. These combined processes result in a simultaneous thermal enhancement and blueshift of the Mn²⁺ emission band associated with the ⁴T₁→⁶A₁ electronic transition. Consequently, the emission intensity recorded in the G channel increases with temperature, while the luminescence signals detected in the B channel exhibit a corresponding decrease. As demonstrated, Ca₁₉Zn₂(PO₄)₁₄:Mn²⁺, Ce³⁺ supports not only sensitive filter-free thermal imaging, but also two additional ratiometric readout schemes: one based on the intensity ratio of Ce³⁺ and Mn²⁺ emissions, and another based on two distinct spectral regions of the Mn²⁺ emission band, yielding maximum relative sensitivities of 0.42 and 2.7%K⁻¹, respectively. This approach introduces a unique thermometric strategy that enables simple, robust, and cost-effective two-dimensional thermal imaging without the need for optical filters or specialized instrumentation.

luminescence thermometry, optical sensors, ratiometric approach, thermal imaging, thermally enhanced Mn2 luminescence

CC-BY

http://dx.doi.org/10.1002/advs.75943

https://onlinelibrary.wiley.com/