为了探索Er3+在Pb(Mg1/3Nb2/3)-PbTiO3弛豫铁电晶体场中的发光特性, 采用高温溶液法生长了PMN-32PT∶Er3+弛豫铁电单晶, 测试并分析了该晶体的微观形貌、相结构、吸收光谱与上转换发射光谱, 利用Judd-Ofelt理论计算了Er3+在PMN-32PT晶体场中的J-O振子强度参数。该晶体四方相晶胞参数为a=0.402 3 nm, c=0.403 3 nm, V=0.065 23 nm3, 单斜相晶胞参数为a=0.403 5 nm, b=0.403 2 nm, c=0.403 1 nm, V=0.065 57 nm3。振子强度参数Ω2=1.77×10-20 cm2, Ω4=1.50×10-20 cm2, Ω6=0.79×10-20 cm2, δrms=0.18×10-6; 4I11/2的理论能级寿命τ=1.75 ms。样品晶体在980 nm光源激发下, 发射出了很强的绿光(552 nm)。研究结果表明PMN-PT∶Er3+单晶是一种性能优异的新型发光晶体。

In order to explore the luminescence characteristics of Er3+ in Pb(Mg1/3Nb2/3)-PbTiO3 relaxor ferroelectric crystal field, PMN-32PT∶Er3+ relaxor ferroelectric single crystal was grown by high temperature solution method. The micro morphology, phase structure, absorption spectrum and up conversion emission spectrum of the crystal were measured and analyzed. The J-O oscillator strength parameters of Er3+ in PMN-32PT∶Er3+ crystal field were calculated by Judd Ofelt theory. The unit cell parameters of the crystals are a=0.402 3 nm, c=0.403 3 nm, V=0.065 23 nm3 and a=0.403 5 nm, b=0.403 2 nm, c=0.403 1 nm, V=0.065 57 nm3 for tetragonal and monoclinic phase respectively. The oscillator strength parameters are Ω2=1.77×10-20 cm2, Ω4=1.50×10-20 cm2, Ω6=0.79×10-20cm2, δrms=0.18×10-6. The calculated radiative lifetime of 4I11/2 is 1.75 ms. Bright green emission band (552 nm) is generate at the 980 nm excitation. The research results suggest that Er3+∶PMN-PT ferroelectric single crystal will be a new promising luminescent crystal.