[Study of spectra characteristics of Ca3SiO5 : Eu2+ phosphor].

The Ca3SiO5 : Eu2+ phosphor was synthesized by the sol-gel reaction method. The emission spectrum was measured by a SPEX1404 spectrophotometer, and the excitation spectrum was measured by a SHIMADZU RF-540 ultraviolet spectrophotometer. All the characterization of the phosphors was conducted at room temperature. The results show that the emission spectrum of Ca3SiO5 : Eu2+ phosphor exhibits one asymmetry band centred at 505 nm under the 365 nm excitation, and the excitation spectrum for 505 nm indicates two bands centred at 374 and 397 nm, respectively. The above results indicate that the phosphor used for w-LEDs can be excited by UV light, and emit green light. The effect of synthesis condition, such as synthesis temperature, synthesis time and Eu2+ concentration, on the emission spectrum of Ca3SiO5 : Eu2+ phosphor was investigated. The results show that the emission peak intensity of Ca3SiO5 : Eu2+ phosphor firstly increases, then decreases with the increase in synthesis temperature or synthesis time or Eu2+ concentration, and reaches the maximum value at 1,100 degrees C, for 4 h and 0.5 mol% Eu2+.