摘要
通过对不同浓度的Ｔｉ：Ａｌ２Ｏ３晶体紫外吸收光谱，可见偏振荧光光谱及其激发光谱的研究，发现峰值４２０ｎｍ的宽带可见荧光，室温下较强的σ偏振光在低温（７７Ｋ）下变得比π偏振光弱。在液氮温度下π偏振光谱分裂成３３０ｎｍ，４２０ｎｍ，４６０ｎｍ，５６０ｎｍ等子荧光带。研究认为，这些发光带分别与色心（Ｆ＋，Ｆ心）及Ｔｉ（４＋）离子的电荷转移跃迁有关。并且室温下可见荧光具有的较强的浓度猝灭及现象来源于Ｔｉ（４＋）离子的浓度猝灭及Ｔｉ（３＋）离子的吸收增强两个因素。峰值于２６６ｎｍ的吸收带是Ｔｉ（４＋），Ｆｅ（２＋）离子的电荷转移吸收。
Concentration effect on the ultraviolet absorption spectrum, visible blueemndssion spectra and the corresPOndent excitation spectra of Ti: Al2O3 crystal had beeninvestigated. At liquid nitrogen temperature,the brosd 420 urn blue emission bandsplitted intO 330 um, 420 um, 460 um and 560 um sub-bands, which were attributedrespectively to the F+ and F centers of the host Al2O3 lattice and Ti4+ related chargetransfer transitions among ligsnds and metal ions. Concentration quenching of the blueemission at room temperature was the co-effect of the emission quenching related toTi4+ ions and the increasing of the blue-green band absorption corresPOnding to Ti3+ ions.Absorption band Peaked at 266 urn in the ultraviolet absorption spectrum was constructedby charge transfer transtions of Ti4+ and Fe3+ ions in Ti: A12O3 crystal.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1995年第1期103-107,共5页
Acta Optica Sinica
