Cr3+:Al2O3透明多晶陶瓷光谱特性分析

对透光性良好的Cr³⁺: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D_q及Racah参数B分别为1792cm^-1， 689cm ^-1，D_q/B=2.6，陶瓷中Cr³⁺离子所处格位的晶体场强 比单晶弱一些，但Cr³⁺:Al₂O₃透明陶瓷仍属于强场晶 体材料；当Cr³⁺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Cr³⁺掺杂浓度的增大，激发峰位发生“红移”.在Cr³⁺:Al₂O₃透明多晶陶瓷的荧光谱上，发现一个波长为670nm的发射峰，经激发 谱确认为Cr³⁺的发射峰. 关键词： 氧化铝 透明陶瓷 离子格位 光谱性质

Spectroscopic characteristics of Cr3+:Al2O3 polycrystalline transparent alumina ceramics

Spectral properties of transparent polycrystalline Cr³⁺:Al₂O₃ ceramics were studied. The results indicated that the absorption peaks of polycrystalline Cr³⁺:Al₂O₃ ceramics co incide 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 character istics of the emission spectra still retains the R-line emission even as the Cr< sup>3+ concentration increases up to 0.8wt%. In particular, one 670nm emis sion peak of Cr³⁺ was first found in the polycrystalline ceramics.