关键词: 白光LED, Sr₂SiO₄∶Dy³⁺, 发光特性

Abstract: The Sr₂SiO₄∶Dy³⁺ phosphor was synthesized by high temperature solid-state method. The emission spectrum of Sr₂SiO₄∶Dy³⁺ shows several bands at 486, 575 and 665 nm under the 365 nm excitation. The excitation spectrum for 575 nm emission has several excitation bands at 331, 361, 371, 397, 435, 461 and 478 nm. The effect of Dy³⁺ concentration on the emission spectrum intensity of Sr₂SiO₄∶Dy³⁺ was investigated, the result shows that the ratio(Y/B) of yellow emission(575 nm) to blue emission(486 nm) increases with increasing Dy³⁺ concentration, the 575 nm yellow emission intensity firstly increases with increasing Dy³⁺ concentration, then decreases. With the condition of immitting the charge compensation, the emission spectrum intensity of Sr₂SiO₄∶Dy³⁺ is enhanced, and the effect is most distinctly with immitting Li⁺.

Key words: White LED, Sr₂SiO₄∶Dy³⁺, Luminescence characteristics