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The Synthesis and Spectroscopic Study of Yag:Ce, Bi(Sm) Phosphor

Author: ZhaoTaoTao
Tutor: MaoYanLi
School: Henan University
Course: Optics
Keywords: YAG: Ce, Bi phosphor YAG: Ce, Sm phosphor Doping concentration Energy transfer
CLC: O482.31
Type: Master's thesis
Year: 2011
Downloads: 170
Quote: 0
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Abstract


With the advent of the world's energy crisis and the deterioration of the global environment, the development of modern science and technology and energy-saving, environmental protection, closely linked. \source era. The blue LED chip excitation YAG: Ce phosphor is the most mature white LED, and industrialization has been achieved, but the luminous efficiency of this approach is not high, and the light-emitting red light component is missing, the color performance is not good, there is still much room for improvement. Around the center, actively looking for a solution, mixed with a small amount of Bi 3 or the Sm 3 in YAG: Ce phosphor, and the resulting samples were characterized to obtain some meaningful results. The first chapter analysis the LED development history, principles, the status quo and applications; List and compare the white LED's to achieve; analysis of the structure and nature of the YAG and YAG: Ce phosphor luminescence mechanism, light-emitting characteristics and various The synthesis method; expounded the historical background of the selected topic of this article, based on research significance. The second chapter describes the drugs used in this experiment, apparatus, experimental methods and characterization techniques. Chapter III Synthesis of a YAG: Ce phosphor, by characterization find the CE 3 and the optimal doping ratio was 0.06, and on this basis, the incorporation of the different concentration of Bi of 3 , analyzes Bi 3 impact on the structure and luminescence properties of YAG: Ce phosphor, found that Bi 3 doped phosphor excitation and emission unchanged spectral shape at the same time improves the luminous intensity of the sample, of Bi 3 , the optimum doping concentration of 0.04, a five-fold increase in luminous intensity, which is of Bi 3 the absorbent energy transfer to Ce 3 due; doping of the Bi 3 unchanged YAG: Ce phosphor structure, the sample is a pure YAG phase and intermediate phase and impurity phase appear, the the Bi 3 and Ce 3 Y << / sub> sup> 3 of occupied position in the crystal lattice; different blanch burning temperature of YAG: Ce and YAG: Ce, Bi phosphor characterize found that as the ignition temperature increases, the luminous intensity of the phosphor is gradually increased, and the phenomenon of particle agglomeration serious and becomes large in size, while the particles are also more uniform sample . Chapter prepared different Sm 3 doping concentrations and different ignition temperature of the YAG: Ce, Sm phosphor Sm 3 doped sample analysis found not changed YAG: Ce phosphor structure, the sample is a pure YAG phase and mesophase and heteroaryl; Sm 3 doping to improve the emission intensity of the sample, and also because Sm 3 characteristic emission spectra in the red zone, YAG: Ce, Sm phosphor in the red zone emission peaks; analysis found in YAG: Ce, Sm phosphor Sm , 3 and Ce 3 of energy transfer is bidirectional transfer of sample excitation and emission spectra of both Ce 3 of characteristic spectral also Sm 3 characteristic spectrum, but to Ce 3 , the main characteristic spectral energy transfer of Ce is also passed to the Sm 3 3 main; temperature of YAG: Ce Sm phosphor and having the same rule for the YAG: Ce, Bi phosphor as the ignition temperature increases, the luminous intensity of the phosphor is gradually enhanced, a serious and becomes large in size and the phenomenon of particle agglomeration. Later can also be studied in other substrates the Bi 3 , the laws of energy transfer between the Sm 3 and the Ce 3 , may also be looking for more sensitizer in order to improve the luminous efficiency of the YAG: Ce phosphor and color quality.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
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