Abstract
The temperature dependence of emission spectra of alkaline earth ortho-silicates M 2SiO 4 (M=Ca, Sr, Ba) doped with Eu 2+ ions is investigated. Two emission bands of Sr 2SiO 4:Eu 2+ show the normal redshift with broadening bandwidth and decreasing emission intensity as an increase in temperature. On the other hand, emission bands of Ca 2SiO 4:Eu 2+ and Ba 2SiO 4:Eu 2+ show the anomalous blueshift with increasing temperature. For Ca 2SiO 4:Eu 2+ and Ba 2SiO 4:Eu 2+, the temperature dependence of the emission color can be described in terms of back tunneling from the excited state of low-energy emission band to the excited state of high-energy emission band in the configuration coordinate diagram. Our phosphors have a promising potential as phosphors for green or greenish white-light-emitting diode pumped by ultraviolet chip.
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