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Rare-earth free sensitizer in NaLuCrF4:Er upconversion material |
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| Authors: | Bui The Huy Zayakhuu Gerelkhuu The-Long Phan Ngo Tran Yong-Ill Lee | |
| Affiliation: | 1. Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Da Nang, Vietnam;2. Department of Chemistry, Changwon National University, Changwon 51140, Republic of Korea;3. Department of Physics, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea | |
| 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 | |
| Keywords: | Upconversion materials Sensitizer Transition metal ions Magnetism | |
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