期刊
OPTICS EXPRESS
卷 18, 期 21, 页码 21663-21668出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.021663
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资金
- National Natural Science Foundation of China [50872123, 50802083]
- National Basic Research Program of China [2006CB8060007]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0651]
We report on conversion of near-ultraviolet and visible radiation ranging from 250 to 500nm into near-infrared emission by a Ca8Mg(SiO4)(4)Cl-2: Eu2+, Er3+ phosphor. Efficient 1530-1560nm Er3+ emission (I-4(13/2)-> I-4(15/2)) was detected under the excitation of Eu2+ (4f -> 5d) absorption band as a result of energy transfer from Eu2+ to Er3+, which is confirmed by both steady state and time-resolved emission spectra. The laser power dependent emission intensity changes were investigated to analysis the energy transfer mechanism. Energy transfer from Eu2+ to Er3+ followed by a multi-photon quantum cutting of Er3+ is proposed. The result indicates that the phosphor has potential application in enhancement of conversion efficient of germanium solar cells because the energy difference of Er3+: I-4(13/2)-> I-4(15/2) transition matches well with the bandgap of Ge (Eg similar to 0.785 eV). (C) 2010 Optical Society of America
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