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Preparation and Properties of Rare Earth-doped Al2O3 Luminescence Materials

Author: XieBingLiang
Tutor: ZhuJiaoQun
School: Wuhan University of Technology
Course: Building materials and engineering
Keywords: Luminescent materials Rare Earth Elements Alumina Electronic transitions
CLC: TU521.3
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 0
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Abstract


Al2O3 has excellent physical and chemical properties, which is an important host material. Currently, the phosphor prepared there are many ways, for example, a precipitation method, a thermal decomposition method, a sol-gel method, a combustion method, a laser evaporation condensation method, CVD method, hydrothermal method, template assembly. Compared to the microemulsion method combined with precipitation method has many advantages, such as the process is simple, the synthesis of high purity of the product, and good uniformity of the chemical composition, the synthesis temperature is low, the particles of the product is relatively uniform, small, etc.. At present, a lot of research on the preparation and optical properties of the the Al2O3 matrix light-emitting materials doped with rare earth ion, but also did not get a lot of progress. This article Al2O3 matrix, rare earth Eu3 and Pr3 activator microemulsion method precipitation combined preparation of Eu3 Pr3 doped Al2O3 luminous powder. The use of modern analytical techniques such as XRD, FTIR, SEM and fluorescence spectrometer, the light-emitting properties of the materials characterization study of the luminescence properties of the material and the influencing factors, and the luminescence mechanism explained. 1, Eu3: Al2O3 luminescent properties of trivalent europium ion doping and calcination temperature. Strong red light emitting luminous physical, six bands are attributed to Eu3 5D0 → 7F0 (579nm) of 5D0 → 7F1 (592 nm) of 5D0 → 7F2 (617nm) of 5D0 → 7F3 (653 nm) and electronic transition 5D0 → 7F4 (700 nm), 5D0 → 7F2 (617nm) electronic transition emission is strongest, and can be used as red light-emitting materials. Get the Eu3 best content for the 1mol%, high luminous intensity Al2O3 Eu3 phosphor can be calcined at 1200 ℃ 2h. 2, trivalent praseodymium ion doping and calcination temperature of the the Pr3: Al2O3 luminous performance impact. Also produced a strong red light emitting phosphor, the excitation spectra is divided into two parts: from the peak at 400nm near and constitute several emission peak located in the vicinity of 451 nm and 471nm, respectively. The former belongs to the Pr3-O2-charge transfer transitions between the energy transfer between the matrix and the Pr3. The latter comes from Pr3 electronic transitions within the 4f shell. Its strongest excitation peak located at 451 nm, and correspond to Pr3 3H6 → 3P0 electronic transitions. Pr3 best content for 1mol%, higher luminous intensity Al2O3: Pr3 phosphor calcined at 1200 ℃ 2h. 3 to study the different sintering pressureless sintering, SPS, pressureless sintering luminescent properties of the sample. Found that the strongest intensity in the emission spectrum of pressureless sintering the resulting sample, the three kinds of sintering are Eu3 doping amount of 1mol%, the light emission intensity is maximum. SPS sintering get Al2O3: of Eu3 luminous powder luminous intensity weaker than normal pressure sintering, mainly due to Al2O3: luminescence of Eu3 powder carbon penetrate its best excitation wavelength of 465nm strongest emission peak at 696nm near . The pressureless sintering prepared Al2O3: Eu3 luminous powder luminous intensity than normal pressure sintering, because there was no more complete combustion pressure compared to atmospheric pressure, is conducive to the removal of organic matter.

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