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Preparation and Luminescent Properties of Rare Earth Ions Doped Nanomaterials

Author: BaoGui
Tutor: WuHongYing；DeGeJiHu
School: Inner Mongolia Normal
Course: Inorganic Chemistry
Keywords: Hydrothermal method Combustion method Upconversion luminescence Y2O3 BaF2
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 254
Quote: 1
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Abstract


Rare Earth Nano luminescent materials exhibit the tantalizing prospect of a lot different from the traditional body relative to the characteristics of the light-emitting materials with potential high quantum efficiency and high resolution. So, choose the appropriate substrate and reaction conditions to synthesize on the high conversion efficiency, good mechanical strength and chemical stability of rare earth doped nano luminescent materials is the main purpose of our basic research workers have. In the ultraviolet to the near infrared, Er3 emission level, it can achieve high efficiency upconversion luminescence as activated ion. Therefore research Er3 doped nano-conversion materials is of great significance in the theoretical study and practical application of the light-emitting materials. In addition, fewer reported in the literature on BaF2 nanorods. This thesis, the first overview of the course of development and research status of rare earth doped nanostructured luminescent materials, and the rare-earth-doped nanostructured luminescent materials luminescence mechanism, the special nature of classification, research and characterization methods, preparation methods and application prospects . Second, by hydrothermal method and combustion method, rare earth doped oxide nanomaterials were synthesized and characterized samples. Finally, one-dimensional doped Eu3 ion BaF2 nanorods and microrods by microemulsion Solvothermal synthesis, and compare them to study the nature of luminescence. The paper's main findings: (a) We use Hydrothermal Synthesis of Y2O3: Er3, Yb3, the results show that the samples after annealing at 1200 ℃ belongs to the cubic phase structure and morphology of the rod, diameter of about 100 nm, length reached micron level, no significant reunion, better dispersion. 980nm LD excitation samples to achieve the blue (408 nm), green (520 ~ 570 nm) and red (650 to 670 nm) upconversion luminescence belong Correspondingly, the radiative transition 2H9 / 2 → 4I15 / 2 , 2H11 / 2,4 S3 / 2 → 4I15 / 2 and 4F9 / 2 → 4I15 / 2. (B) Combustion Synthesis of Y2O3: Er3, Gd3 Yb3 The results show that the samples were synthesized at different annealing temperatures belong to the cubic phase structure, and confirmed by the combustion method can be prepared no impurity phase of Y2O3: of Er3 , Gd3, Yb3 nanocrystals. 978nm laser excitation of Y2O3: Er3, Gd3 Yb3 nanocrystalline achieve blue-green (490nm), green (510 ~ 572nm) and red (630 ~ 710nm) upconversion luminescence belong Correspondingly, the radiative transition 4F7 / 2 → 4I15 / 2,2 H11 / 2,4 S3 / 2 → 4I15 / 2 and 4F9 / 2 → 4I15 / 2. With the improvement of the annealing temperature, the PL intensity enhanced gradually. However, if considering the actual industrial production conditions and energy consumption, the annealing temperature was 800 ° C may be more efficient higher. (C) microemulsion Solvothermal synthesis BaF2: Eu microrods and BaF2: Eu nanorods, research results show that the: single-phase crystal sample is free of impurities; microrods is the three-dimensional structure of the nanorods is one-dimensional The structure; under the excitation of the ultraviolet lamp, the light emission characteristics of the sample with the previous report of BaF2: Eu nanocrystal different. Due to the surface defects of the sample has a great influence on nanorods photoluminescence process, the surface defects of the sample will weaken the relative luminous intensity of the nanorods.

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