Luminescence of NaGdFPO{sub 4}:Ln {sup 3+} after VUV excitation: A comparison with GdPO{sub 4}:Ln {sup 3+} (Ln=Ce, Tb)

Journal Article · Mon May 15 04:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.01.044· OSTI ID:20784997

Zifeng, Tian ^[1]; Hongbin, Liang ^[1]; Huihong, Lin ^[1]; Qiang, Su ^[1]; Bei, Guo ^[1]; Guobin, Zhang ^[2]; Yibing, Fu ^[2]

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1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275 (China)
2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026 (China)

The phosphors NaGdFPO{sub 4}:Ln {sup 3+} and GdPO{sub 4}:Ln {sup 3+} (for Ln{sup 3+}=Ce{sup 3+} and Tb{sup 3+}) were prepared by solid-state reaction technique, the VUV-vis spectroscopic properties of the phosphors were investigated, and we vividly compare the luminescence of Ce{sup 3+} and Tb{sup 3+} in the hosts. For phosphors GdPO{sub 4}:Ln {sup 3+}, the band near 155 nm in VUV excitation spectrum is assumed to be the host-related absorption, and for NaGdFPO{sub 4}:Ln {sup 3+} the absorption is moved to longer wavelength, near 170 nm, showing the P-O bond covalency increased after fluoridation. The f-d transitions of Ce{sup 3+} and Tb{sup 3+} in the host lattices are assigned and corroborated, and it was found that the 5d states are with lower energy in NaGdFPO{sub 4}:Ln {sup 3+} than those in GdPO{sub 4}:Ln {sup 3+}. For fluoridation of GdPO{sub 4}:Ln {sup 3+} to NaGdFPO{sub 4}:Ln {sup 3+}, the energy change of Ln {sup 3+} (Ln=Ce, Tb) 5d states is consistent with that of host-related absorption.

• OSTI ID: 20784997
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM IONS
EXCITATION
FAR ULTRAVIOLET RADIATION
FLUORIDES
GADOLINIUM PHOSPHATES
LUMINESCENCE
SODIUM COMPOUNDS
TERBIUM IONS