摘要
采用提拉法生长出光学质量的Nd:ZnWO_4,Ce:ZnWO_4和Ce:Nd:ZnWO_4晶体。通过X射线衍射仪对晶体样品的微观结构进行了分析。测试了晶体的吸收光谱、电感耦合等离子体原子发射光谱和荧光光谱。根据Judd-Ofelt理论计算出Nd:ZnWO_4晶体中Nd^(3+)的强度参数为:Ω_2=6.8202×10^(-20) cm^2,Ω_4=0.463 3×10^(-20)cm^2,Ω_6=0.4435×10^(-20)cm^2。研究了Ce^(3+)和Nd^(3+)之间的能量转移现象。结果表明:Nd^(3+)在850nm激发时产生上转换发射峰位于474nm和572nm处,分别对应于~2G_(9/2),~4K_(13/2)到基态能级~4I_(9/2)跃迁,计算出该峰的自发辐射几率为1 360 s^(-1),荧光寿命为7.353×10^(-4)s,发射截面为0.9059×10^(-23)cm^2。
Optical quality Nd：ZnWO4, Ce：ZnWO4 and Ce：Nd：ZnWO4 crystals were grown by the Czochralski method. The structure of the crystal was analyzed by X-ray diffraction. The absorption spectrum, inductively coupled plasma atomic emission spectrum and fluorescence spectrum of the crystals were measured. According to the theory of Judd-Ofelt and the absorption spectrum measurement results, the intensity parameters of Nd^3＋ ions in Nd：ZnWO4 crystal were calculated to be Ω2=6.820 2×10^-20 cm^2, Ω4=0.463 3 × 10^-20 cm^2 and Ω6=0.443 5 × 10^-20 cm^2. The energy transfer between Ce^3＋ ions and Nd^3＋ ions was studied. The results show that the emission peaks of Nd^3＋ located at 474 nm and 572 nm produced after excitation using a 850 nm laser can convert the up conversion fluorescence, corresponding to the transitions from the excited states of ^2G9/2 and ^4K13/2 to the ground state of 419/2. The calculated spontaneous emission transition probability, the fluorescence lifetime and the emission cross section are 1360 s^-1, 7.353 × 10^-4 s and 0.905 9 × 10^-23 cm^2, respectively.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第11期1526-1530,共5页
Journal of The Chinese Ceramic Society
关键词
共掺铈钕钨酸锌晶体
荧光光谱
上转换荧光
能量转移
激光晶体
neodymium and cerium co-doped zinc tungstate crystal
fluorescence spectrum
up-conversion fluorescence
energy transfer
laser crystal
