【作者】 黄抒洁；

【导师】 郑志强；

【作者基本信息】 福建师范大学 ， 光学， 2006， 硕士

【摘要】 稀土掺杂锆钛酸铅镧（PLZT）电光陶瓷在多功能器件、集成光学和上转换器件等方面有潜在的应用价值。本论文主要研究了稀土掺杂PLZT电光陶瓷的发光特性、辐射特性以及频率上转换特性。 研究了掺钕PLZT电光陶瓷的光谱特性和光辐射特性，用Judd-Ofelt（J-O）理论，通过吸收光谱计算得到强度参量，利用强度参量分别计算了⁴F_3／2亚稳态辐射寿命、辐射跃迁几率、荧光分支比，同时测量了⁴F_3／2亚稳态的荧光寿命并计算了该能级的荧光量子效率。并且利用荧光光谱计算了⁴F_3／2→⁴I_J’的受激发射截面。 研究了掺铒PLZT的光谱特性及光辐射特性。通过Er³⁺离子的吸收光谱，利用Judd-Ofelt理论，计算得到强度参量，并由强度参量计算得到Er³⁺离子各能级电偶极辐射跃迁几率、磁偶极辐射跃迁几率、总的辐射跃迁几率、荧光分支比和辐射寿命，测量了⁴I_13／2亚稳态的荧光寿命，利用荧光光谱计算了⁴I_13／2→⁴I_15／2的受激发射截面。 测量了980nm激发下Er³⁺离子的上转换荧光谱，分析了980nm激发下掺铒PLZT上转换发光的过程，建立可描述系统动力学过程的上转换速率方程，并且用该速率方程从理论上研究掺铒PLZT陶瓷材料中的上转换行为，确定上转换发光的产生机制。同时还测量了803nm激发下Nd³⁺离子的上转换荧光谱，对掺钕PLZT电光陶瓷在803nm激发下的上转换情况做了简要的分析。更多还原

【Abstract】 Rare earth-doped ferroelectric Lead Lanthanum Zirconate Titanate（PLZT） ceramics have a great prospect to be applied for monolithic multifunction compact devices, integrated optic and upconversion devices. The optical properties, radiative properties and upconversion luminescence characteristics of rare earth-doped ferroelectric PLZT ceramics have been studied in this thesis.The spectrum properties and optical radiative properties of Nd³⁺ doped PLZT were studied. Based on Judd-Ofelt（J-O） theory, the J-0 intensity parameters were calculated using the absorption spectrum of Nd³⁺ doped PLZT. The J-0 intensity parameters were also used to calculate the radiative lifetime of the metastable ⁴F_3/2 state, the radiative, transition probabilities and the fluorescence branch ratios. The fluorescence lifetime of the metastable ⁴F_3/2 state was measured and its quantum efficiency was calculated. The stimulated emission cross-sections of the ⁴F_3/2→⁴I_J’ transition were also calculated using the emission spectrum.The spectrum properties and optical radiative properties of Er³⁺ in PLZT were analyzed. Absorption spectrum was presented for Er³⁺ in PLZT. Based on Judd-Ofelt theory, the J-O intensity parameters were calculated using the absorption spectrum of Er³⁺ in PLZT. The intensity parameters of Er³⁺ have been used to calculate electric dipole radiative transition rates, magnetic dipole radiative transition rates, total radiative transition rates, branching ratios and radiative lifetimes in every level. The fluorescence lifetime of the metastable ⁴I_13/2 state was measured. The stimulated emission cross-section of the ⁴/_13/2→⁴I_15/2 transition was also calculated using the emission spectrum.The upconversion fluorescence spectrum of Er³⁺ exciting at 980nm was measured. Under 980nm excitation, the upconversion luminescence processes of Er³⁺ in PLZT were analyzed, and the upconversion rate equations which described the dynamic process of the system were built. Using the rate equations, the upconversion behavior of Er³⁺ in PLZT was studied in theory. The upconversion luminescence mechanism was confirmed. At the same time, the upconversion fluorescence spectrum of Nd³⁺ exciting at 803nm was also measured, the upconversion luminescence properties of Nd³⁺ in PLZT were analyzed更多还原