Eu^(2+)激活的Ca_3SiO_5绿色荧光粉的制备和发光特性研究

Preparation and luminescence characteristics of Eu^(2+) activated Ca_3SiO_5 green-emitting phosphor

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501nm和次峰值为570nm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VanUitert经验公式,确认Ca3SiO5Eu2+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—450nm的波长范围,峰值位于375nm处,可以被InGaN管芯产生的350—410nm辐射有效激发.

The preparation and the luminescent properties of green-emitting phosphor Ca3SiO5 ： Eu^2＋ 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 501 nm and 570 nm, respectively, originate from the centers of Eu^2＋ ions. There are two different Eu^2＋ emitting centers in Ca3SiO5 ： Eu^2＋ , which has been confirmed by the experiment results and empirical formula of Van Uitert, and the Eu^2＋ ions occupy Ca^2＋ 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.