레이저 어블레이션을 이용한 YAG:Ce^(3+) yellow phosphor의 광학적 특성

Abstract

Nowadays, new technologies have been established by linking with conventional fields such as materials, electrics, and physics in a variety of industries. Yttrium aluminum garnet (Y3Al5O12 , YAG) phosphors activated by rare elements have been researched in a varieties of fields. YAG:Ce is a promising material in LED (light emitting diode), BLU (back light unit), phosphors materials, laser host and scintillator. It is not easy to synthesize the YAG:Ce using the conventional method. because of its high melting point and structure of complex oxide. Polymerized complex method and SPS (spark plasma sintering) were used to overcome the disadvantages of conventional methods. In this study, YAG:Ce nanoparticles were fabricated by laser ablation in liquid phase. Laser ablation in liquid phase (PLA) is a process that molten particles flow out from target irradiated by laser and quenched in water. This process has been studied gradually for several reasons : Rapid process to obtain nanoparticles, synthesis of nanoparticles difficult to fabricate. In this research, both relationship between variables and results in experiment and change of optical properties caused by nano-size were studied. Design of nanoparticles in liquid phase by PLA shows not only easy accessibility to fabricate nanoparticles, but also potentials to discover new nanostructure. The above-mentioned unique strategies on nano-architectural design by the PLA process can be used to design nanostructure of other functional ceramic materials.