Rare Earth Doped Materials Preparation and Luminescence Properties
Rare Earth Nano-luminescent material exhibits a lot different from the traditional characteristics of the bulk light-emitting materials, with potential for high quantum efficiency and high resolution light-emitting enticing prospect.So, choose a suitable substrate and reaction conditions for synthesis of high efficiency, good mechanical strength and chemical stability of rare earth doped luminescent materials is the basic research workers, their main purpose.In the ultraviolet to the near infrared, Er3 + emission level with rich, as activated ion can achieve highly efficient upconversion luminescence.Therefore studies on Er3 + doped nano-materials in the luminescent materials convert the theoretical study and practical application of great significance.In addition, the BaF2 nanorods reported less.
Everbeen magnets supply you the rare earth magnets such as neodymium magnets,ceramic magnets,which is the strong magnets and permanent magnets.and rubber magnets,fridge magnets,Refrigerator Magnets etc.
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Add:Unit H, 4F Rihua Mansion, No. 8 Xinfeng 2nd road, Torch Hi-Tech Zone, Xiamen, China.
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This thesis, first, a review of the rare-earth doped luminescent materials and research status of the development process, and introduced the rare-earth doped luminescent materials emitting mechanism, special nature, classification, research and characterization methods, preparation methods and application prospects.Secondly, the use of hydrothermal and combustion method, rare-earth doped oxides were synthesized and characterized nanomaterials samples.Finally, we microemulsion solvothermal synthesis of Eu3 + ions doped one-dimensional nanorods and micron bar BaF2, and compared them to study their luminescent properties.
The results of this thesis:
we use the hydrothermal synthesis of Y2O3: Er3 +, Yb3 +, results show that after annealing at 1200 β the sample belongs to cubic structure, the morphology of the rod, a diameter of about 100nm, length of the micron level, no reuniongood distribution.In the 980nm LD excitation, the sample to achieve the blue (408 nm), green (520 ~ 570 nm) and red (650 ~ 670 nm) upconversion luminescence, corresponding radiative transition belong 2H9 / 2 → 4I15 / 2,2H11 / 2,4 S3 / 2 → 4I15 / 2 and 4F9 / 2 → 4I15 / 2 and so on.(B) we use the combustion synthesis of Y2O3: Er3 +, Gd3 +, Yb3 +, results show that at different annealing temperature synthesized samples belong to the cubic phase, and confirmed by combustion can be prepared without complex phase of the Y2O3: Er3 +, Gd3 +, Yb3 + nanocrystals.The 978nm laser excitation, Y2O3: Er3 +, Gd3 +, Yb3 + nanocrystals achieved blue-green (490nm), green (510 ~ 572nm) and red (630 ~ 710nm) upconversion luminescence, corresponding radiative transition belong to 4F7/ 2 → 4I15 / 2,2 H11 / 2,4 S3 / 2 → 4I15 / 2 and 4F9 / 2 → 4I15 / 2 and so on.With the increase of annealing temperature, the sample emission intensity gradually increased with the trend.But if we consider the actual conditions of industrial production and energy consumption, select the annealing temperature is 800 β may be more efficient.
(C) we use the micro-emulsion solvent thermal synthesis of BaF2: Eu-micron rods and BaF2: Eu nanorods, the results show that: the sample is free of impurities of the single-phase crystals; micron rods are three-dimensional structure, and is one-dimensional nanorodsstructure; in the UV light excitation, the luminescence properties of the sample with the previous report of BaF2: Eu nanocrystals is different.Defect on the sample surface PL nanorods have a great impact on the process, the sample surface defects will weaken the relative luminescence intensity of nanorods.
Everbeen magnets supply you the rare earth magnets such as neodymium magnets,ceramic magnets,which is the strong magnets and permanent magnets.and rubber magnets,fridge magnets,Refrigerator Magnets etc.
Xiamen Everbeen Magnet Electron Co.,Ltd. http://www.chinamagnets.biz
Add:Unit H, 4F Rihua Mansion, No. 8 Xinfeng 2nd road, Torch Hi-Tech Zone, Xiamen, China.
Tel:0086-592-5781916
Fax:0086-592-5123653
E-mail:sales@china-magnet.net
