高压下Na_5Eu(WO_4)_4的光谱和晶场参数  

HIGH PRESSURE SPECTRA AND CRYSTAL PARAMETERS OF Na_5 Eu(WO_4 )_4 MICROCRYSTAL

作　　者：郭常新[1] 何越峰[1] 李碧琳[2] 崔宏滨[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026 [2]中国科学技术大学结构分析研究开放实验室,合肥230026

出　　处：《发光学报》1992年第3期200-208,共9页Chinese Journal of Luminescence

摘　　要：四钨酸铕钠Na_5Eu(WO_4)_4是化学计量的基质发光材料,发光来源于基质中高浓度的Eu^(3+).本工作用金刚石对顶砧显微高压光谱系统,在0～8GPa范围内研究了Na_5Eu(WO_4)_4的Eu^(3+)室温光谱,确定了各发射谱线在高压下的红移率.根据晶场理论,确定了Eu^(3+)各能级用晶场参数表示的公式,并与高压下谱线位置实验值定出的能级值拟合,计算出晶场参数B_q(kq=20、40、44、60、64)随压力的变化率ΔB_(kq)/ΔP.Na5Eu(WO4)4 is a good stoichimetric host luminescent material. The light emission eomes from high concentration host ions Eu3 + . The effects of hydropressure on fluorescence of Eu3 + in Na5Eu(WO4)4 have been in-vistigated under 0-80kbar at room temperature using a diamond anvil high pressure microspeetroscopic system. According to crystal field theory, the crystal parameter formulars of energy levels of Eu3 + (in approximatary D2d point group symmetary site) are determind and fit with the experimental data of energy levels under high pressure. Then the ratios of crystal parameter variation AAAAAAAAABkq (kq = 20, 40, 44, 60 and 64) to pressure variation AAAAAAAAAAP are calculated.

关 键 词：四钨酸铕纳 光谱 晶场参数 高压 

分 类 号：O482.3[理学—固体物理]