RF 열플라즈마를 이용한 Y2O3: Eu 3+ 적색 나노 형광체 분말 합성
Synthesis and characterization of Y2O3 : Eu 3+ red nano phosphor powders using RF thermal plasma
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Y2O3: Eu 3+는 우수한 적색 발광 특성을 가지고 있는 형광체로 최근 고화질 디스플레이에 대한 수요가 증가함에따라 관련 연구가 활발히 진행되고 있다. 본 연구에서는 RF 열플라즈마 합성법과 고상법을 이용하여 Y2O3: Eu 3+ 적색 형광체를 합성하였으며, 합성 방법에 따른 Y2O3: Eu 3+ 적색 형광체의 결정 구조, 미세 구조, 발광 특성의 차이를 XRD, TEM, PL 분석을 통해 비교하였다. 고상법으로 합성된 Y2O3: Eu 3+ 적색 형광체의 입자는 약 10~20 μm 크기를 가지는 반면, RF 열플라즈마 합성법을 통해 합성된 적색 형광체는 반응부는 약 100 nm, 필터부는 약 30 nm의 크기를 갖는 나노 형광체로확인되었다. 합성된 모든 분말들은 PL 측정결과 611 nm( 5 D0→ 7 F2)에서 발광하는 것을 확인하였으며, 결정 크기와 입도가증가할수록 PL intensity가 증가하였다. 또한, 추가 열처리 공정이 필요 없는 one-step 공정의 RF 열플라즈마 공정을 통해합성된 Y2O3: Eu 3+ 적색 나노 형광체는 고상법으로 합성된 적색 형광체와 비슷한 발광 특성을 보이는 것을 확인할 수 있었다.
Abstract
Y2O3 : Eu 3+ is an excellent red-emitting phosphor, which has been widely used for display devices due to highly luminescent property and chemical stability. In this study, Y2O3 : Eu 3+ red phosphors were prepared using the solid state reaction and RF thermal plasma synthesis. The particle size of Y2O3 : Eu 3+ phosphors obtained by the solid state reaction varied from 10 to 20 μm, and 30~100 nanometer sized Y2O3 : Eu 3+ particles were obtained from a liquid form of raw material through RF thermal plasma synthesis without an additional heat treatment. Photoluminescence measurements of the obtained Y2O3 : Eu 3+ particles showed a red emission peak at 611 nm ( 5 D0→ 7 F2). PL intensity of red nano phosphors prepared by RF thermal plasma synthesis was comparable to that of red phosphors prepared by the solid state reaction, indicating that nano-sized Y2O3 : Eu 3+ red phosphors could be successfully synthesized using one-step process of RF thermal plasma.
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