Eu2+激活的Ca3SiO5绿色荧光粉的制备和发光特性研究

研究了Eu²⁺激活的绿色发光材料Ca₃SiO₅的制备条件和发光性质. Eu²⁺中心形成主峰值为501 nm和次峰值为570 nm的特征宽带，两峰值叠加形成发射峰值为502nm的绿色发射光谱带. 利用这些光谱结果和Van Uitert 经验公式，确认Ca₃SiO₅:Eu²⁺中存在两种性质有差异的Eu²⁺发光中心，它们分别占据基质中八配位的Ca²⁺(Ⅰ)格位和四配位的Ca²⁺(Ⅱ)格位. 其激发光谱分布在250—450 nm的波长范围，峰值位于375 nm处，可以被InGaN管芯产生的350—410 nm辐射有效激发. 关键词：发光荧光粉绿色荧光粉3SiO₅')" href="#">Ca₃SiO₅2+')" href="#">Eu²⁺

Preparation and luminescence characteristics of Eu2+ activated Ca3SiO5 green-emitting phosphor

The preparation and the luminescent properties of green-emitting phosphor Ca₃SiO₅:Eu²⁺ have been studied. The broad green emission band with the peak located at 502 nm which consists of a main and a subsidiary emission peak at 501nm and 570nm，respectively， originate from the centers of Eu²⁺ ions. There are two different Eu²⁺ emitting centers in Ca₃SiO₅:Eu²⁺, which has been confirmed by the experiment results and empirical formula of Van Uitert，and the Eu²⁺ ions occupy Ca²⁺ sites with coordination number 8 and 4 in this phase. The excitation spectra extend from 250 nm to 450 nm and the excitation peak positions are located around 375 nm. The phosphor can be excited effectively by InGaN chip emitting in the range of 350—410 nm.