Effect of gadolinium incorporation on optical characteristics of YNbO4:Eu3+ phosphors for lamp applications
来源期刊：Journal of Rare Earths2012年第3期
论文作者：Sung Hwan Choi G. Anoop Dong Wook Suh Kyung Pil Kim Hyun Ju Lee Jae Soo Yoo
文章页码：205 - 209
摘 要：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 5D0→7F2 transition in Eu3+ ions. The highest luminance for Y1-x-yGdyNbO4:Eux3+ 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:Eu3+0.18 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 μm with uniform size distribution of particles was obtained.
Sung Hwan Choi，G. Anoop，Dong Wook Suh，Kyung Pil Kim，Hyun Ju Lee，Jae Soo Yoo
Display Materials Laboratory, School of Chemical Engineering and Materials Science, Chung-Ang University
摘 要：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 5D0→7F2 transition in Eu3+ ions. The highest luminance for Y1-x-yGdyNbO4:Eux3+ 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:Eu3+0.18 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 μm with uniform size distribution of particles was obtained.
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