Green Upconversion Luminescence of Li+/Er3+/Yb3+ Tridoped CaWO4 and Effects of Er3+ Concentration
- Title
- Green Upconversion Luminescence of Li+/Er3+/Yb3+ Tridoped CaWO4 and Effects of Er3+ Concentration
- Other Titles
- Er3+
- Author
- 심광보
- Keywords
- SOLAR-CELLS; SPRAY-PYROLYSIS; NANOCRYSTALS; CRYSTALS; FLUORESCENCE; TUNGSTATES; PHOSPHORS; LABELS; ZNWO4; STATE
- Issue Date
- 2011-11
- Publisher
- Electrochemical SOC INC
- Citation
- Journal of Electrochemical Society, 2011, 158(6), P.J345-J348
- Abstract
- Li+/Er3+/Yb3+ tridoped CaWO4 polycrystalline powders were prepared by a solid-state reaction method and their upconversion (UC) luminescence properties were investigated in detail. Under 980 nm laser excitation, CaWO4:Li+/Er3+/Yb3+ powder exhibited weak red emission near 680 nm and strong green UC emission peaks at 530 and 550 nm, which were due to the transitions of Er3+ (F-4(9/2), H-2(11/2), S-4(3/2)) -> Er3+ (I-4(15/2)), respectively. The optimum doping concentration of Er3+ was investigated based on crystal structural variation and concentration quenching induced by energy transfer of cross relaxation process in CaWO4. Moreover, the effects of Er3+ concentration on UC emission intensity ratios (S-4(3/2). I-4(15/2) versus H-2(11/2) -> I-4(15/2) and F-4(9/2) -> I-4(15/2)) were studied in detail. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.036111jes] All rights reserved.
- URI
- http://jes.ecsdl.org/content/158/11/J345
- ISSN
- 0013-4651
- DOI
- 10.1149/2.036111jes
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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