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The Synthesis and Spectral Properties of Gd2O3: Ce, Bi and YAG: Ce, Bi Nanophosphor

Author: XuQingHai
Tutor: MaoYanLi
School: Henan University
Course: Optical Engineering
Keywords: Gd2O3: Er, Bi YAG: Ce, Bi Energy transfer Spectroscopic Properties
CLC: O482.31
Type: Master's thesis
Year: 2009
Downloads: 199
Quote: 0
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Abstract


Nano-rare earth luminescent materials have been widely applied to lighting, optical information transmission, fluorescence labeling and other fields. Nano fluorescent material particularly in enhancing the spatial resolution of the optical display device has a unique advantage, making his presence emitting devices, plasma flat panel displays, cathode ray tubes and a variety of flat panel display has a very good prospect, therefore, in recent years on improving Existing nano-rare earth luminescent material properties and exploring new rare earth luminescent nano-materials research has attracted more and more attention and interest. In sensitized fluorescent material doped ions can effectively improve the strength and efficiency of some phosphors, this thesis discusses the Gd 2 O 3 : Er and YAG: Ce nanocrystals photoluminescence, based on the study of the Bi 3 ion doping on Gd 2 O 3 : Er and YAG: Ce nanocrystals photoluminescence characteristics, has made some interesting results. 1 citric acid as a combustion agent prepared by combustion synthesis Gd 2 O 3 : Er nanocrystals by X-ray diffraction, UV - visible - near infrared spectroscopy photometer, fluorescence spectrometer for Gd 2 O 3 : Er nanocrystalline structure and luminescence properties were analyzed. The results obtained show were pure cubic phase Gd 2 O 3 : Er nanocrystals, the average grain size of about 29.3 nm. At room temperature were investigated samples when excited at 376 nm and 980 nm excitation luminescence properties of light excitation upconversion emission characteristics were observed Er 3 ions in strong fluorescence emission, the main emission peak position at 559 nm at (Er 3 of ( 2 H 11/2 , 4 S 3 / 2 ) → 4 I 15/2 transitions). And to analyze and discuss the Er 3 doping concentration on Gd 2 O 3 : Er luminescence properties of nanocrystals. 2 Combustion prepared different Bi 3 doping concentration Gd 2 O 3 : Er, Bi nanocrystals doped Bi 3 and non-doped Bi 3 emission spectra of samples have similar shapes, have shown Er 3 characteristic emission, Gd 2 O 3 : Er, Bi nanocrystals at 559 nm at Er 3 ions characteristic emission intensity was significantly enhanced, and with Bi 3 -doped concentration. Analysts believe that the Bi 3 to ultraviolet light has a strong absorption and the absorbed energy to the Er 3 greater chance of ion transfer, resulting in Er 3 ion emission intensity increased significantly. When Bi 3 -doping concentration is larger, multiple Bi 3 may form aggregates, these aggregates serve as capture centers without energy absorption of radiation scattered, makes Bi 3 ions on Er 3 ion sensitizing efficiency is significantly reduced, luminous intensity decreases. 3 as a combustion agent citrate were prepared by combustion synthesis of the YAG: Ce nano-crystalline at room temperature, excitation 455nm respectively Nanocrystalline YAG: Ce, the observed Ce 3 ion strong fluorescence characteristic emission. Preparation conditions affect their luminescence properties, when Ce 3 doping concentration of 6 mol%, the annealing temperature is 1000 ℃, citric acid and rare earth ions ratio (C / M) is 2.0 light-emitting properties of the most gifted. 4-doped Bi 3 has not changed after the YAG: Ce structure, but makes Ce 3 ions characteristic emission intensity significantly enhanced. When Bi 3 ion doping concentration 6mol% when, Ce 3 emission peak integrated intensity increased several times. This is due to Bi 3 to ultraviolet light has a strong absorption and the absorbed energy to the Ce 3 greater chance of ion transfer, resulting in Ce 3 emission intensity increased significantly.

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