摘要
采用传统无压烧结工艺制备Cr:Al2O3透明多晶陶瓷.测定了其退火前后的吸收光谱和荧光光谱,发现在Al2O3六配位的八面体结构中,Cr4+的荧光发射也处在1100—1600nm波段的红外区间,荧光发射峰位于1223nm附近,类似Cr4+在四面体中的发光行为.同时由于氧化铝晶格常数较小,晶体场强较强,使Cr4+:Al2O3荧光发射峰相对其他Cr4+掺杂的晶体发生蓝移.由于Cr4+:Al2O3中Cr4+是位于八面体配位结构中,其荧光发射峰较窄,半高宽Δλ仅为37nm.
Transparent polycrystalline Cr： Al2O3 ceramics were synthesized by conventional pressureless synthesis processing. The absorption and emission spectra of Cr：Al2O3 ceramics specimens before and after annealing were measured at room temperature. It was discovered that the emission spectra of Cr^4＋ in Al2O3 octahedral coordination site is in infrared wavelength range of 1100--1600 nm. The emission peak of Cr^4＋ is centered at 1223 nm, which i,~ similar to that of Cr^4＋ in tetrahedral site. Al2O3 has smaller lattice constant, resulting in the larger crystal field strength, so there is a blue Shift in the peak of Cr^4＋ ： Al2O3 ceramics compared to those of other Cr^4＋ -doped crystals. And the emission band is much narrower with full width at half maximum △λ 37 nm.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第8期4166-4169,共4页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60578041)资助的课题.~~
