期刊
JOURNAL OF LUMINESCENCE
卷 131, 期 11, 页码 2359-2364出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2011.05.046
关键词
Phosphor; Magnesium aluminate spinel; Mn2+; Cr3+; Energy transfer
类别
资金
- National Natural Science Foundation of China [50472032, 50672105]
- Science and Technology Commission of Shanghai Municipality [08DZ1140900]
The Mn-, Cr-doped and Mn, Cr-co-doped MgAl2O4 powders have been synthesized via a gel-solid reaction method. Energy transfer from Mn2+ to Cr3+ has been observed for the first time in the co-doped MgAl2O4 phosphors. When excited with blue light with a wavelength of 450 nm at room temperature, both green emission from Mn2+ around 520 nm and red emission from Cr3+ around 675and 693 nm were generated. Moreover, the color of the emission can be modified by controlling the doping concentrations of Mn2+ and Cr3+. Therefore, MgAl2O4: Mn2+, Cr3+ could be used as a single-phased phosphor for white LED with a blue LED chip. The energy transfer in terms of Mn2+ to Cr3+ is determined by means of radiation and reabsorption. (C) 2011 Elsevier B.V. All rights reserved.
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