Effect of gadolinium incorporation on optical characteristics of YNbO4:Eu3+ phosphors for lamp applications
- Authors
- Choi, Sung Hwan; Anoop, G.; Suh, Dong Wook; Kim, Kyung Pil; Lee, Hyun Ju; Yoo, Jae Soo
- Issue Date
- Mar-2012
- Publisher
- The Metallurgical Industry Press
- Keywords
- YNbO4:Eu; oxide phosphors; rare earths
- Citation
- Journal of Rare Earths, v.30, no.3, pp 205 - 209
- Pages
- 5
- Journal Title
- Journal of Rare Earths
- Volume
- 30
- Number
- 3
- Start Page
- 205
- End Page
- 209
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/20488
- DOI
- 10.1016/S1002-0721(12)60024-6
- ISSN
- 1002-0721
- Abstract
- Eu3+-doped (Y,Gd)NbO4 phosphor was synthesized by solid-state reaction for possible application in cold cathode fluorescent lamps. A broad absorption band with peak maximum at 272 nm was observed which was due to the charge transfer between Eu3+ ions and neighboring oxygen anions. A deep red emission at the peak wavelength of 612 nm was observed which could be attributed to the D-5(0)-> F-7(2) transition in Eu3+ ions. The highest luminance for Y1-x-yGdyNbO4:Eu-x(3+) under 254 nm excitation was achieved at Eu3+ concentration of 18 mol.% (x=0.18) and Gd3+ concentration of 8.2 mol.% (y=0.082). The luminance of Y0.738Gd0.082NbO4:Eu-0.18(3+) was higher than that of a typical commercial phosphor Y2O3:Eu3+ and the CIE chromaticity coordinate was (0.6490, 0.3506), which was deeper than that of Y2O3:Eu3+. The particle size of the synthesized phosphors was controlled by the NaCl flux and particle size as high as 8 mu m with uniform size distribution of particles was obtained.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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