CaS·Cu+,Eu2+的光致发光及其在农业生产中的应用

研究了Cu+,Eu2+共激活的CaS的发光性质及激活剂浓度与荧光性质的关系.Cu+和Eu2+的发射光谱分别在430 nm附近及630 nm附近,它们是由Cu''Ca-Vs2+中心的离子发射和Eu2+的5d-4f跃迁发射产生的.实验结果表明,Cu+对Eu2+荧光发射有较强的敏化作用,Eu2+对Cu+发射峰值波长和强度也有显著影响;单掺Eu2+或Cu+的荧光粉是良好的农用薄膜红,蓝光转换剂,共掺Eu2+和Cu+的CaS荧光粉作光转换农膜添加剂可望人工模拟叶绿素的吸收光谱,使作物在植物最佳生长作用光谱环境中生长,促使作物早熟或提高作物产量.

PHOTOLUMINESCENCE AND APPLICATION OF CaS·Cu+,Eu2+

The fluorescence-of Cu+ and Eu2+ coactivated CaS is reported. The emission bands of Cu+and Eu2+ peaking at 430 nm and 630 nm were originated from Cu+ transition of Cu''Ca-Vs2+ centers and 5d-4f transition of Eu2+,respectively. The dependence of luminescence properties of Cu+nd Eu2+ on their concentration was investigatad. The emission of Eu2+ is sensitized by Cu+ and the peak wavelength and intensity of Cu+-emission band are affected by Eu2+. The experimental results indicate that there exists effective energy transfer from Cu+ to Eu2+ in CaS host. CaS·Cu+ and CaS·Eu2+ are good red-light transition agent and blue-light trasition agent for farm film,respectively. The absorption spectrum of chlorophyll photosynthesis can be imitated-by light transition film for farm using CaS·Cu+,Eu2+ phosphor as additive,Which can make the crops growth in the environment of function spectrum of the best growth of plants,and promote its growth or increase yield.