Preparation And Optical Properties Of Novel Glass Containing Nanocrystals For Illuminant Application

This work includes two parts, the part one employed a novel ultrasonic atomizationprecipitation method, synthesized the YAG phosphor powders at different concentrations and atdifferent calcined temperatures. The results and development are presented as follows.By using ultrasonic atomization and co-precipitation process, we synthesized high-qualityYAG:Nd phosphor powder. We founded that the powders have YAG:Nd phase structure when thecalcined temperature reached to900℃with the formation of Y₂O₃and YAM existed in associateddocuments, the Y₂O₃and YAM phases of the powers change to pure YAG cubic phase at thetemperature1300℃, single YAG phase have been obtained. The transition for precursor to pureYAG is not direct but experience a transitional process like: the precursorâ†'YAM+YAPâ†'YAG.These results provide a new experimental support for the opinion that some relevant papersreported. When the Nd-doping concentration increased from2mol%to10mol%, with the increaseof doping concentration of Nd³⁺, the absorption coefficient increased and no change occurred inpure YAG phase at1300℃. The results demonstrated that the ultrasonic atomization and co-precipitation precipitation method is a promising approach for obtaining homogenous YAG:Ndphosphor powders.On the base of previous experiments, the second part explored a new technique to synthesizethe Glass-ceramic that including YAG phase. We fabricated the glasses by conventional meltingmethod, after that, high-quality YAG phosphor powder was chosen, we then compounded the twomaterials to formed Glass-Ceramics by chemical methods, after melting, annealing, at the end ofthis work, we successfully obtained the novel transparent YAG phase glass containing nanocrystalswithout any crystallization. This method possesses the advantages of high luminous efficiency,more excellent processability and low cost which presents a promising approach in the future.