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The Preparation And Properties Of Ytterbium Ion And Erbium Ion Co-doped Up-conversion Luminescent Glass Ceramic

Posted on:2017-09-17Degree:MasterType:Thesis
Country:ChinaCandidate:W Y ChengFull Text:PDF
GTID:2311330503953944Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
Rare earth ions doped up-conversion luminescent glass ceramic has received extensive attentions due to the applications in the areas of the optical communication, lasers, solar cells, display. So far, owing to the mature techniques, the up-conversion luminescent glass materials, especially the bulk one, are still prepared by the conventional method of melt-quenching and annealing. However, the volatilization and aggregation cannot be avoided during the melting process that required high temperature and long time. Thus, controlling the glass composition is difficult, and the concentration of the doped rare earth ions is low. These problems mentioned above significantly weaken the performance of the up-conversion luminescence materials and limit the applications at the same time.This paper adopts a new approach of solid phase sintering to prepare the up-conversion luminescent glass ceramic materials. Firstly, NaYF4 up-conversion luminous powders and Y2O3 up-conversion luminous powders were synthesized as luminous primitives. Next, these two powders were mixed with mesoporous SBA-15 powder respectively. Finally, the spark plasma sintering(SPS) technology was used to prepare the up-conversion luminescent glass ceramic material. The effects on the microstructures and the properties, like concentration, sintering factors, have been systematically researched. The main research contents in this article are as follows:(1) Utilizing NaYF4: Yb3+, Er3+ powders synthesized by chemical method as raw material, we have prepared the NaYF4 ceramics by the pressureless sintering and the spark plasma sintering(SPS) and systematically studied the influences of the factors, like sintering temperature, holding time and post-treatment on ceramic density, microstructure and luminous performance. The results show that the phase composition and luminous intensity of ceramic samples prepared by pressureless sintering change with the rising of sintering temperature. When the sintering temperature is 600?, the crystalline phase of the ceramic sample is pure hexagonal phase ?-NaYF4: Yb3+, Er3+ and possess the best luminescent performance. The densities of the ceramic samples are enlarged with the increased sintering temperature and extended holding time. All the ceramic samples prepared by SPS technology possess excellent fluorescence intensity and the maximum relative density of the sample could reach 97%.(2) The NaYF4 compound glasses sintered with NaYF4: Yb3+, Er3+ and SBA-15 composite powdersby SPS technology. We systematically study the impact of the sintering temperature and NaYF4: Yb3+, Er3+ content on the fluorescent intensity of the samples. The results indicate that the preparation method of the NaYF4:Yb3+, Er3+ powder, means coprecipitation method or hydrothermal synthesis, plays an important role in the properties of the glass ceramic. The transmittance of the glass samples prepared by NaYF4:Yb3+, Er3+ powder synthesized by coprecipitation method increases firstly and then decreases with the increasing of sintering temperature. When the sintering temperature is 980 ?, the sample possesses the largest luminescence intensity and the best transmittance. After investigating the luminescence performance of glass samples with different NaYF4: Yb3+, Er3+ content, the glass sample with 5wt% content possesses the maximum luminous intensity. For NaYF4: Yb3+, Er3+ glass prepared by NaYF4: Yb3+, Er3+ powders synthesized by hydrothermal synthesis, the luminous intensity of 4wt% content glass sample is the largest. From the SEM and TEM photographs, the morphology and the size of the particles observed are similar with those of NaYF4 powder, which obviously demonstrates that the NaYF4 could be preserved in the glass substrate via SPS technology.(3) We sintered Y2O3:Yb3+, Er3+ and SBA-15 composite powders to prepare Y2Oup-conversion luminescent glass by SPS technology. The influences of the sintering temperature, heating rate and Y2O3: Yb3+, Er3+ content have been systematically researched on the properties of the samples. The transmittance of the glass samples increases firstly and then decreases with the increasing of sintering temperature. When the sintering temperature is 1050?, the sample possesses the largest luminescence intensity and the best transmittance. Through changing the heating rate, the result shows that raising the heating rate can improve the luminous intensity and the transparency of glass samples. When the heating rate is 200?/min, the transparency and luminescence properties of samples are the best. After investigating the luminescence performance of glass samples with different Y2O3:Yb3+, Er3+ content, the more Y2O3:Yb3+, Er3+ in the glass sample, the better luminous intensity the samples possess.
Keywords/Search Tags:Up-conversion luminescence, SPS technology, NaYF4, Y2O3, Ceramic glass
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