Cr^(3+):Al_2O_3透明多晶陶瓷光谱特性分析

Spectroscopic characteristics of Cr^(3+):Al_2O_3 polycrystalline transparent alumina ceramics

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Dq及Racah参数B分别为1792cm-1,689cm-1,Dq/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.

Spectral properties of transparent polycrystalline Cr^3＋： Al2O3 ceramics were studied. The results indicated that the absorption peaks of polycrystalline Cr^3＋： 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 Cr^3＋： Al2O3 polycrystalline ceramics is almost the same as that of Cr^3＋： Al2O3 single crystal, and the characteristics of the emission spectra still retains the R-line emission even as the Cr^3＋ concentration increases up to 0.8wt%. In particular, one 670nm emission peak of Cr^3＋ was first found in the polycrystalline ceramics.