Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 39, Pages 44039-44048Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11730
Keywords
manganese; terbium; Sr4Al14O25 nanocrystals; luminescent thermometer; thermal imaging; thermochromicity; chromatic coordinates; relative sensitivity
Funding
- National Science Center Poland (NCN) [DEC-UMO-2018/31/G/ST5/03258]
- German Research Foundation (DFG) [426574030]
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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.
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