Luminescent Properties of Gd3PO7:Eu in UV/VUV Region
ZENG Xiao-Qing1, HONG Guang-Yan1, YOU Hong-Peng1, WU Xue-Yan1, KIM Chang-Hong2, PYUN Chong-Hong2, YU Byung-Yong2, BAE Hyun-Sook2, PARK Cheal-Hee2, KWON Il-Eok2
1Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun 130022
2Solid State Chemistry Labortory, Korea Institute of Science and Technology, P. O. Box 131, Cheongryang, Seoul 130-650, Korea
Luminescent Properties of Gd3PO7:Eu in UV/VUV Region
1Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun 130022
2Solid State Chemistry Labortory, Korea Institute of Science and Technology, P. O. Box 131, Cheongryang, Seoul 130-650, Korea
Abstract： The luminescent properties of Gd3PO7:Eu were investigated in UV and VUV regions. This phosphor has so strong emissions around 618.5 nm under UV excitation, especially around 209\,nm, so that it has a better colour saturation than that of Y2O3:Eu. It would be a new potential red phosphor for lamp and other applications with UV-excitation source or even for displaying device. In the VUV excitation spectrum of Eu3+ emissions, energy absorptions by Gd3+, Gd-O and PO3-4 were observed, on which it can be inferred that there are three kinds of energy transferring processes to Eu3+ ions. The energy absorptions of Gd3+, Gd-O and PO3-4 are induced by 4f → 4f transitions, band-gap transition of Gd3PO7 and intramolecular (2t2 → 2a, 3t2) transition, respectively. The energy transfer efficiency of the PO3-4 intramolecular transition is lower compared with that of the band-gap transition (Gd-O).
2001, Vol. 18 
