Inkjet printing of functional oxide nanostructures from solution-based inks |
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| Authors: | " target="_blank">Aleksander Matavž Barbara Malič |
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| Institution: | 1.Tula State University,Tula,Russia;2.Laboratory of Cytology of Microorganisms,G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences,Pushchino,Russia |
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| Abstract: | YAG:Ce and YAG:Eu sols were synthesized by a polymeric sol-gel route. The crystallization temperature of YAG was determined by X-ray diffraction as a function of the calcination temperature, revealing that YAG starts to crystallize directly from the amorphous phase at 800?°C. The effects of the thermal treatment and the dopant amount on the photoluminescent properties were studied, observing the highest emission after calcination at 1000?°C for 1?h in both cases and with a concentration of 1 and 3?mol% of Ce and Eu, respectively. Core-shell materials were prepared by dipping YAG:Ce or YAG:Eu sintered pellets into the synthesized sols and then, these materials were calcined at 1000?°C for 1?h. An effective energy transfer from Ce to Eu was observed in the sample YAG:Eu (core)–YAG:Ce (shell) when blue light (λ?=?465?nm) is used as excitation source. This wavelength excites the Ce but not the Eu; however, in the photoluminescence emission spectrum, the bands associated to both ions can be clearly detected, confirming that the core-shell strategy is a good method for the preparation of warmer white LEDs. | |
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