다양한 온도조건과 flux 첨가량에 따른 단결정 성장용 YAG : Er 3+ 분말 제조
Fabrication of YAG : Er 3+ powders for the single crystal growth according to the synthetic temperature and flux concentration
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초록
본 연구에서는 고상법 및 flux를 이용하여 Y3Al5O12 : Er 3+ (YAG : Er 3+ ) 분말을 저온에서 성공적으로 합성하였다. 분말의 합성 여부와 분말 하소 시 온도에 따른 결정성을 분석하기 위하여 X-ray diffraction(XRD)를 측정하였다. 순수한YAG는 일반적인 고상법으로 합성할 경우, 1400 o C에서 12시간 동안 하소하여 순수한 YAG 상을 얻을 수 있었고, 반면에BaF2를 첨가한 결과는 상대적으로 낮은 온도(1000 o C)에서 합성되었다. 즉, 합성온도를 약 400 o C 가량 낮출 수 있는 것으로나타났다. 또한, BaF2의 최적의 농도를 찾아 첨가 후, 열처리 온도에 따라 BaF2로 인한 입자의 형태 및 크기를 조사하였으며 그에 따른 발광강도에 대하여 논의하였다.
Abstract
In this study, using solid-state and flux, Y3Al5O12 : Er 3+ (YAG : Er 3+ ) powders were successfully synthesized at low temperatures. To analyze the crystallinity of powders according to the synthesis or non-synthesis of powders and powder calcination temperatures, X-ray diffraction (XRD) was measured. In the case of pure YAG, when YAG was analyzed using the general solid-phase method, it was calcined for 12 hours at 1400 o C and pure YAG phase could be obtained. But when BaF2 was added to YAG, YAG was synthesized at lower temperature (1000 o C). It was thus found that the synthesis temperature could be lowered by about 400 o C. Also, when BaF2 with an optimal concentration was added to YAG : Er 3+ , the particle shape and size according to synthesis temperatures were surveyed, and corresponding luminous intensity was discussed.
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