Visible up-conversion luminescence of CaWO4: Er3+,Yb3+ and emission enhancement by tri-doping of Li+ ions
- Title
- Visible up-conversion luminescence of CaWO4: Er3+,Yb3+ and emission enhancement by tri-doping of Li+ ions
- Author
- 심광보
- Keywords
- NAYF4 NANOCRYSTALS; GLASS-CERAMICS; GREEN; CRYSTALS; ER3+; YB3+; SENSITIVITY; Y2O3-ER3+; PHOSPHOR; POWDERS
- Issue Date
- 2012-04
- Publisher
- KOREAN INSTITUTE OF CHEMICAL ENGINEER
- Citation
- KOREAN JOURNAL OF CHEMICAL ENGINEERING, Apr 2012, 29(4), P.519-524
- Abstract
- r3+,Yb3+ co-doped CaWO4 polycrystalline powders were prepared by a solid-state reaction and their up-conversion (UC) luminescence properties were investigated in detail. Under 980 nm laser excitation, CaWO4: Er3+,Yb3+ powder exhibited green UC emission peaks at 530 and 550 nm, which were due to the transitions of Er3+ (H-2(11/2))-> Er3+ (I-4(15/2)) and Er3+ (S-4(3/2))-> Er3+ (I-4(15/2)), respectively. Effects of Li+ tri-doping into CaWO4: Er3+,Yb3+ were investigated. The introduction of Li+ ions reduced the optimum calcinations temperature about 100 A degrees C by a liquid-phase sintering process and the UC emission intensity was remarkably enhanced by Li+ ions, which could be attributed to the lowering of the symmetry of the crystal field around Er3+ ions.
- URI
- https://link.springer.com/article/10.1007%2Fs11814-011-0196-0http://hdl.handle.net/20.500.11754/49024
- ISSN
- 0256-1115
- DOI
- 10.1007/s11814-011-0196-0
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML