Cr^3＋：Al2O3透明多晶陶瓷光谱特性分析

对透光性良好的Cr^3＋：Al2O3透明多晶陶瓷的光谱性能进行了研究，其吸收光谱中吸收峰与单晶红宝石相一致，按吸收光谱和Tanabe-Sugano能级图，算出其晶场强度参数Dq及Racah参数B分别为1792cm^-1，689cm^-1，Dq／B=2．6，陶瓷中Cr^3＋离子所处格位的晶体场强比单晶弱一些，但Cr^3＋：Al2O3透明陶瓷仍属于强场晶体材料；当Cr^3＋掺杂浓度到达0．8wt％时，陶瓷的发射谱仍保持较好的R线发射；随Cr^3＋掺杂浓度的增大，激发峰位发生“红移”．在Cr^3＋：Al2O3透

Spectral properties of transparent polycrystalline C3+ : Al2O3 ceramics were studied. The results indicated that the absorption peaks of polycrystalline Cr3+ : Al2O3 ceramics coincide with the absorption spectrum of a ruby single crystal. The crystal field and Racah parameters were calculated according to the Tanabe-Sugano energy level diagram and absorption spectra. The crystal field intensity of Cr3+ : Al2O3 polycrystalline ceramics is almost the same as that of Cr3(+) : Al2O3 single crystal, and the characteristics of the emission spectra still retains the R-line emission even as the Cr3+ concentration increases up to 0.8wt%. In particular, one 670nm emission peak of Cr3+ was first found in the polycrystalline ceramics.