期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 517, 期 -, 页码 170-175出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.12.072
关键词
NaGdTiO4: Dy3+; Energy transfer; Fluorescence quenching; Thermal quenching; Crossover effect
资金
- NSFC (National Natural Science Foundation of China) [50972021, 11104023, 61078061, 11104024]
- Scientific Research Foundation for Doctoral program of Liaoning Province of China [20111032, 20111031]
- China Postdoctoral Science Foundation [20110491539]
- Fundamental Research Funds for the Central Universities
Dy3+-doped NaGdTiO4 phosphors were synthesized by a solid-state reaction method. The crystal structure, spectral properties and fluorescence quenching of the phosphors were systematically studied by means of X-ray diffraction (XRD) and spectroscopy. It was found that the phosphors can be effectively excited by 281 nm ultraviolet light, and intense white light emission was observed. The white light was generated by mixing blue (483 nm) and yellow (578 nm) emissions corresponding to the transitions from F-4(9/2) to H-6(15/2) and H-6(13/2) levels of Dy3+. The electric dipole-dipole interaction between Dy3+ ions was identified as the main mechanism for the concentration dependent fluorescence quenching of 4F9/2 level. The CIE color coordinates of the phosphors were calculated to be (x = 0.3345, y = 0.3535) in the white region under 281 nm excitation, which is very close to the E point (energy equal point, x = 0.3333, y = 0.3333). In addition, the thermal quenching behavior of F-4(9/2) level of Dy3+ was also discussed, and the crossover effect was confirmed to be the dominant physical mechanism responsible for the fluorescence temperature quenching of Dy3+ in NaGdTiO4 host. (C) 2011 Elsevier B.V. All rights reserved.
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