Er 3+ , Yb 3+ 이온이 동시 도핑된 NaGd(MoO4)2의 업컨버젼 분석
Upconversion luminescence from poly-crystalline Yb 3+ , Er 3+ co-doped NaGd(MoO4)2 by simple solid state method
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초록
본 연구에서는 간단 고상합성법(solid state reaction method)을 이용하여 Yb 3+ , Er 3+ 이온이 동시도핑된NaGd(MoO4)2 (NaGd(MoO4)2: Yb 3+ /Er 3+ )를 성공적으로 합성하였으며, 결정구조 및 광학적 특성을 면밀히 분석하였다. 980 nm의 근적외선 레이저를 합성된 NaGd(MoO4)2 파우더에 조사하였을 때 NaGd(MoO4)2: Yb 3+ /Er 3+ 분말은 540 및 550 nm 부근에서 강한 녹색 발광과 함께 650 및 670 nm 부근에서의 매우약한 적색 발광을 하였으며 이러한 업컨버젼 발광 현상은Er 3+ 이온 내의 infra 4f transition에 의한 현상임을 확인할 수 있었다. 또한, Yb 3+ 및 Er 3+ 이온의 최적 도핑 농도는 각각(10.0/10.0 mol%)로 확인되었으며, 그에 따른 upconversion 발광 메커니즘에 대하여 상세히 논의하였다.
Abstract
Up-conversion (UC) luminescence properties of polycrystalline Er 3+ /Yb 3+ doped NaGd(MoO4)2 phosphors synthesized by a simple solid-state reaction method were investigated in detail. Used to 980 nm excitation (InfraRed area), Er 3+ /Yb 3+ co-doped NaGd(MoO4)2 exhibited very weak red emissions near 650 and 670 nm, and very strong green UC emissions at 540 and 550 nm corresponding to the infra 4f transitions of Er 3+ ( 4 F9/2, 2 H11/2, 4 S3/2)→Er 3+ ( 4 I15/2). The optimum doping concentration of Er 3+ , Yb 3+ for highest emission intensity was determined by XRD and PL analysis. The Er 3+ /Yb 3+ (10.0/10.0 mol%) co-doped NaGd(MoO4)2 phosphor sample exhibited very strong shiny green emission. A possible UC mechanism for Er 3+ /Yb 3+ co-doped NaGd(MoO4)2 depending on the pump power dependence was discussed.
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