期刊
OPTICS AND LASER TECHNOLOGY
卷 46, 期 -, 页码 14-19出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2012.04.015
关键词
Borates; Concentration quenching; Near-UV LED
资金
- National Natural Science Foundation of China [21171152]
- Guangdong Province Enterprise-University-Academy Collaborative Project [2010B090400437]
A series of NaSrBO3:xEu(3+) and NaSr1-2xBO3:xEu(3+), xM(+) (M=Li, Na, K) phosphors were synthesized by the solid state reaction. The crystal structure, photoluminescence properties and concentration quenching of NaSrBO3:Eu3+ phosphors were systematically investigated. The excitation spectra indicate that the phosphors can be efficiently excited by 394 nm, which is matched well with the emission wavelength of near-UV LED chip. All the samples show the characteristic red emission of Eu3+ ions (D-5(0)-> F-7(J), J=0, 1, 2, 3 and 4). The maximum intensity of luminescence is observed at the Eu3+ concentration around x=0.11. The concentration quenching of Eu3+ in NaSrBO3:Eu3+ phosphor can be mainly attributed to quadrupole-quadrupole interaction. The relative emission intensities of Eu3+ (D-5(0)-> F-7(2)) in NaSrBO3:Eu3+ phosphors with Li+, Na+ or K+ introduced as charge compensator are significantly enhanced, and the phosphors added with K ions show the strongest emission. The emission intensities of NaSr1-2xBO3:xEu(3+), xM(+) (M=Li, Na, K) are about 1.47, 1.64 and 2.08 times than that of commercial red phosphor Y2O2S:Eu3+. These results indicate that NaSr1-2xBO3:xEu(3+), xM(+) (M=Li, Na, K) phosphors exhibit potential applications in the field of near-UV LED as an efficient red-emitting phosphors. (C) 2012 Elsevier Ltd. All rights reserved.
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