Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 44, Issue 33, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/44/33/335403
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Funding
- NSFC (National Natural Science Foundation of China) [50972021, 61078061, 50802010]
- Foundation of Education Department of Liaoning Province [L2010056]
- National High Technology Research and Development Program (863) [2009AA03Z401]
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NaGdTiO4 phosphors with various Eu3+ concentrations were synthesized by a solid-state reaction. The crystal structure and fluorescence properties were characterized by means of x-ray diffraction and fluorospectroscopy, respectively. An effective energy transfer from the titanate matrix to the activator Eu3+ was observed. An intense red emission originating from D-5(0) -> F-7(2) of Eu3+ was observed while excited at the TiO44- charge transfer bands or f-f absorption bands of Eu3+. The fluorescence quenching of D-5(J) (J = 1, 2 and 3) levels were studied based on the Van Uitert model. Electric dipole-dipole interaction was confirmed to be the main mechanism of the fluorescence quenching of D-5(J) levels, which is responsible for the cross-relaxation between Eu3+ ions. The full optical transition intensity parameters Omega(lambda) (lambda = 2, 4, 6) of Eu3+ in the NaGdTiO4 phosphors were calculated in the framework of Judd-Ofelt theory to be 6.024 x 10(-20), 1.512 x 10(-20) and 0.374 x 10(-20) cm(2).
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