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7001226 
Journal Article 
Thermochromic Luminescent Nanomaterials Based on Mn4+/Tb3+ Codoping for Temperature Imaging with Digital Cameras 
Piotrowski, W; Trejgis, K; Maciejewska, K; Ledwa, K; Fond, B; Marciniak, L; , 
2020 
1 
ACS Applied Materials & Interfaces
ISSN: 1944-8244
EISSN: 1944-8252 
AMER CHEMICAL SOC 
WASHINGTON 
12 
39 
44039-44048 
English 
32902945 
WOS:000577111700072 
A new thermographic nanocrystalline Sr4Al14O25:Mn4+,Tb3+ phosphor was developed, and the concentrations of both dopants and the synthesis conditions were optimized. The combination of the thermally quenched luminescence from the Mn4+ ions to the almost temperature-independent emission from Tb3+ provides a sensitive luminescent thermometer (S-R = 2.8%/degrees C at 150 degrees C) with strong emission color variability. In addition, a figure of merit for this luminescence thermochromism was proposed, as the relative sensitivities of the x and y CIE coordinates, which for this phosphor reaches at 150 degrees C S-R(x) = 0.6%/degrees C and S-R(y) = 0.4%/degrees C, respectively. Noncontact thermal imaging was demonstrated with this phosphor using a single consumer digital camera and exploiting the ratio of red (R) and green (G) channels of the RGB images, thereby confirming the high application potential of Sr4Al14O25:Mn4+,Tb3+ nanocrystals for thermal sensing and mapping.