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Effect spectroscopy study of energy transfer between ions doped nanocrystals

Author: ZhangXiSheng
Tutor: ZhengHaiRong
School: Shaanxi Normal University
Course: Optics
Keywords: Rare earth ions Nanocrystals Energy Transfer Cross-relaxation Fluorescence radiation
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 64
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Abstract


The rare earth ion doped fluorescent materials has been widely used in lighting, flat panel displays, optical communications, and the production of lasers and other fields. Crystal and glass is often used as the matrix material of the rare-earth ion doped rare earth doped nanocrystals in recent years developed a new type of light-emitting materials, which combines the advantages of nano-materials and rare earth ions occupy an important position in the light-emitting materials. Numerous studies indicate that the co-doped system often appears to electron transfer, energy transfer phenomena, resulting in abnormal valence state of rare earth ions and sensitizing effect, and different substrates and different synthesis methods have a direct impact on the luminescence properties of the material. So far, a total energy transfer between rare earth ions doped system is still very limited, we can expect, however, that such materials must have excellent features and broad application prospects. Trivalent Tm 3 ions and Pr 3 ion in the visible and infrared bands are very attractive launch, with a wide range of application prospects. Single doped Tm 3 the ion or Pr 3 ion luminous phenomenon and mechanism of nanoparticles, crystal, glass and fiber materials, has been widely reported. Tm 3 the ion 1 D 2 - 3 F 4 (about 453 nm ) and Pr 3 ions 3 P 0 - 3 H 4 (about 480 nm) transition in the blue region, has an important significance in the data storage, information technology, laser printing, color display and medical therefore Tm 3 ions and Pr 3 the ion double blending single doped materials have been attracting a large number of scholars. This thesis the Pr the 3 / Tm 3 fluoride and fluorine ions co-doped oxide nanomaterials laser irradiation energy transfer spectroscopic properties. Full text can be divided into four parts: the first part the LaF 3 / LaOF nanoparticles preparation methods and influencing factors hydrothermal method and solvent thermal method is a method of preparing nanoparticles a simple and easy to operate. This section describes the LaF 3 nanoparticles prepared at lower temperatures, and on this basis, using a new method the sintering process the LaOF nanoparticles, and discusses the impact of nano- particle growth factors. By X-ray diffraction, atomic force microscopy and transmission electron microscopy fluorescence spectroscopy to characterize the nanoparticles, the nanoparticles with good dispersion and uniformity. The second part the LaF 3 : Pr 3 / Tm 3 co-doped nano system Pr 3 and Tm 3 effect of energy transfer between the ion spectroscopy method to study the application of laser spectroscopy to study the the LaF 3 : the Pr 3 / Tm 3 fluorescence radiative transition . By excite Tm 3 Research the LaF 3 : Pr 3 / Tm 3 in Tm 3 < / sup> ion to Pr 3 ion energy transfer and the spectral properties, respectively, discussed the impact of the doping concentration and samples of ambient temperature on the energy transfer. And energy transfer mechanism analysis. Results show that laser excitation in the system of co-doped nano Tm 3 ion, increasing Pr 3 doping concentration, reduce the temperature of the sample environment, conducive to enhanced Pr < sup> 3 ion and Tm 3 ion between energy transfer. The third part LaOF: Pr 3 / Tm 3 codoped Nanosystems Pr 3 and Tm 3 ion of Spectroscopic studies on the application of laser spectroscopy of the effect of the energy transfer between research the LaF 3 : Pr 3 / the Tm 3 fluorescence radiative transition. By excite Tm 3 , studied LaOF: Pr 3 / Tm 3 in Tm 3 ion to Pr 3 ion energy transfer and the corresponding spectroscopic properties, discussed the influence of the doping concentration and the ambient temperature of the sample on the energy transfer. And energy transfer mechanism analysis. Temperature and substrate of the fourth part of the co-doped LaF 3 (LaOF): Pr 3 / Tm 3 Pr 3 and energy transfer between Tm 3 ions affect the application of the methods of laser spectroscopy, to Pr 3 / the Tm 3 ion double the nanoparticles doped LaF 3 / LaOF study, matrix composition and sample the ambient temperature of the laser pump Pr 3 and the Tm 3 ion doped Nanosystems fluorescence radiation, and the influence of the energy transfer efficiency, and to seek to obtain a high efficiency of energy transfer in the system conditions.

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