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Optical Radiative And Upconversion Luminescence Properties Of Rare Earth-doped Ferroelectric PLZT Ceramics

Posted on:2007-09-16Degree:MasterType:Thesis
Country:ChinaCandidate:S J HuangFull Text:PDF
GTID:2120360185489587Subject:Optics
Abstract/Summary:PDF Full Text Request
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 4F3/2 state, the radiative, transition probabilities and the fluorescence branch ratios. The fluorescence lifetime of the metastable 4F3/2 state was measured and its quantum efficiency was calculated. The stimulated emission cross-sections of the 4F3/2→4IJ' 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 4I13/2 state was measured. The stimulated emission cross-section of the 4/13/2→4I15/2 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...
Keywords/Search Tags:PLZT ferroelectric ceramics, Rare-earth-doped, Judd-Ofelt theory, Radiative properties, Upconversion
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