Rare-earth free sensitizer in NaLuCrF4:Er upconversion material
- Authors
- Bui The Huy; Gerelkhuu, Zayakhuu; The-Long Phan; Ngo Tran; Lee, Yong-Ill
- Issue Date
- Nov-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Upconversion materials; Sensitizer; Transition metal ions; Magnetism
- Citation
- JOURNAL OF RARE EARTHS, v.37, no.4, pp.345 - 349
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF RARE EARTHS
- Volume
- 37
- Number
- 4
- Start Page
- 345
- End Page
- 349
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190866
- DOI
- 10.1016/j.jre.2018.07.011
- ISSN
- 1002-0721
- Abstract
- Upconversion phosphors are known as a material system that can convert near-infrared light into visible/ultraviolet emissions by sequentially absorbing multiple photons. The studies on upconversion materials often use two rare earth (RE) ions as a sensitizer-activator pair. We investigated the influences on luminescence intensity depending on Cr-doping content (x) of hexagonal NaLu0.98-xCrxF4Er0.02 (x = 0-0.9) upconversion material by substituting Lu3+ ions with Cr3+ in the absence of Gd3+. The change in upconversion luminescence intensity appears with saddle-like shape. We suggest that Cr3+ ions play the dual role as a constituent in host lattice and a sensitizer in the upconversion process. Optimal conditions for gaining the strongest upconversion emission correspond to x = 0.3-0.5, where there are effective energy transfers between Cr3+ and Er3+ ions and Cr-Er dimers. Apart from these values, the emission intensity decreases rapidly which can be ascribed to the absence of multiple-photon absorption for the case of low Cr3+ contents, and to the coupling between Cr3+ and/or Er3+ ions for the case of high Cr3+ contents. Magnetization and electron-spin-resonant measurements were performed to understand the correlation between the optical and magnetic properties. (C) 2019 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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