最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

A series of luminescence phosphors Ca0.955Al2-xBxSi2O8: Eu2+ (x=0～0.7) were prepared by solid-state reaction in weak reductive atmosphere. The lattice positions and the luminescent mechanism of Eu2+ in the host were discussed. The effects of BⅢ-substitution on the host lattices and spectral properties were also investigated. It is found that when BⅢ enters CaAl2Si2O8 lattice and substitutes AlⅢ, complete solid solutions are formed in the whole range of x = 0～0.7. The lattice parameters (a, b, c, γ) and unit cell volumes of phosphors Ca0.955Al2-xGaxSi2O8:Eu2+ (x=0～1.0) decrease linearly and the lattice parameters(α，β) increase linearly as BⅢ content increases. A broad excitation spectrum consists of four excitation bands, which are located between 225 nm and 420 nm，the maximum excitation wavelength of which is at 352 nm，and FWHM decreases from 112 nm to 95 nm with the increase of the substitution amount of BⅢ. The emission spectrum, which is also a broad band between 370 nm and 600 nm，can be fitted by two peaks at 423 nm and 460 nm and its apparent peak is at 425 nm. Two fitted peaks are blue shifted, and the intensity ratio of the fitted peaks decreases linearly with increasing of the amount of BⅢ-substitution