Journal
JOURNAL OF RARE EARTHS
Volume 39, Issue 3, Pages 269-276Publisher
ELSEVIER
DOI: 10.1016/j.jre.2020.05.008
Keywords
Broadband near-infrared; Energy transfer; Garnet phosphor; Rare earths
Categories
Funding
- National Key Research and Development Program of China [2016YFB400605]
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Broadband near-infrared phosphors CLHA:Cr3+ and CLHA:Ce3+,Cr3+ were synthesized and their emission properties were studied. Energy transfer mechanism was analyzed and the potential application in nondestructive quality-control analysis systems for food was highlighted.
Broadband near-infrared phosphors are highly desirable for food testing. Targeted Ca2LuHf2Al3O12:Cr3+ (CLHA:Cr3+) and Ca2LuHf2Al3O12:Ce3+,Cr3+ (CLHA:Ce3+, Cr3+) phosphors were synthesized by the conventional high-temperature solid state reaction. The CLHA:Cr(3+ )phosphor, with a good thermal stability, shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr3+ content. For co-doped sample, the emission intensity of Cr3+ can be enhanced by three times due to the energy transfer from Ce3+ to Cr3+, which can be evidenced by a significant overlap between the PLE of Cr3+ single-doped phosphor and the PL of Ce3+ single-doped phosphor. In addition, the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay lifetime and Dexter's energy transfer formula. The broadband NIR emission peaked at 775 nm of CLHA:Cr3+,Ce3+ phosphor shows a bright prospect in nondestructive quality-control analysis systems for food. (C) 2020 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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