Homogeneous precipitation method를 통한 나노 YAG : Ce 형광체 합성과 광학 특성
Synthesis and luminescence characteristics of nano-sized YAG : Ce phosphors by homogeneous precipitation method
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본 연구에서는 homogeneous precipitation method를 통하여 구형의 단분산(monodispersed) YAG : Ce 3+를 합성했다. 단분산 YAG : Ce 3+의 전구체를 합성하는 과정에서 aluminum ion들이 먼저 석출되어 aluminum 화합물을 형성하고 후에yttrium 화합물들이 aluminum 화합물들의 표면에서 석출된다. 합성된 전구체를 파우더형태로 얻기 위해 건조과정을 거치는데, oven에서 건조했을 때 보다 동결건조기에서 건조했을 때 비교적 구형의 단분산 YAG : Ce 3+ 입자를 얻을 수 있었다. 하소 과정에서 공정을 진행하는 온도로서 1100 o C와 1200 o C를 비교해 보았다. 실험 결과 1200 o C의 온도로 상압에서 6시간 동안의 하소 과정을 진행하였을 때 400~500 nm 입자크기를 가진 단분산된 구형의 나노 YAG : Ce 3+ 입자가 합성되었다.
Abstract
In this study, spherical monodispersed cerium-doped yttrium aluminum garnet (YAG : Ce 3+ ) phosphor particles were synthesized via homogeneous precipitation method using the mixed solution of yttrium nitrate, cerium nitrate, aluminum nitrate, ammonium aluminum sulfate, and urea as a precipitant. During the process of precursors of monodispersed YAG : Ce 3+ , aluminum ions which form spherical aluminum compounds precipitated first and yttrium compounds precipitated onto the surface of the existing spherical aluminum compounds. Drying process using lyophilization could obtain monodispered spherical YAG : Ce 3+ particles compare to using oven. The thermal calcination process of YAG : Ce 3+ precursors under the temperature of 1200 o C for 6 h was enough to obtain 400~500 nm sized YAG particles with pure YAG phase.
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