Emission color variation of M2SiO4:Eu (M=Ba, Sr, Ca) phosphors for light-emitting diode |
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Authors: | JS Kim PE Jeon JC Choi HL Park |
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Institution: | Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, South Korea |
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Abstract: | The luminescent properties of alkaline earth orthosilicates M2SiO4 (M=Ba, Sr, Ca) doped with Eu2+ ions are investigated. Two emission bands are assigned to the f-d transitions of Eu2+ ions doped into two different cation sites in host lattices confirmed by electron paramagnetic resonance signal. Two emission bands show the different emission color variation with substituting M2+ cations with smaller cations. This behavior is discussed in terms of two competing factors of the crystal field strength and covalence. Also the decay times are in order of 600-1000 ns. These phosphors with maximum excitation of around 370 nm can be applied as a color-tunable phosphor for light-emitting diode based on ultraviolet chip/phosphor technology. |
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Keywords: | 61 10 &minus i 78 60 HK |
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