Samarium doped apatite-type orange-red emitting phosphor Ca5（PO4）2SiO4 with satisfactory thermal properties for n-UV w-LEDs  

作　　者：Ze Zhang Jialiang Niu Wei Zhou Dingdian Xu Huanhuan Du 

机构地区：[1]Department of Chemistry,School of Science,Beijing Technology and Business University

出　　处：《Journal of Rare Earths》2019年第9期949-954,I0002,共7页稀土学报（英文版）

基　　金：supported by the Research Foundation for Youth Scholars of Beijing Technology and Business University (QNJJ2019-06,PXM2019_014213_000007)

摘　　要：A novel single-phase Sm^3+activated Ca5(PO4)2SiO4 phosphor was successfully fabricated via a conventional solid-state method,which can be e fficie ntly excited by near ultraviolet(n-UV)light-emitting chips.The crystal structure and luminescence properties were characterized and analyzed systematically by using relevant instruments.The Ca5(PO4)2SiO4:Sm^3+phosphor shows an orange-red emission peaking at600 nm under the excitation of 403 nm and the optimal doping concentration of Sm^3+is determined to be 0.08,The critical distance of Ca5(PO4)2SiO4:0.08 Sm^3+is calculated to be 1.849 nm and concentration quenching mechanism of the Sm^3+in Ca5(PO4)2SiO4 host is ascribed to energy transfer between nearestneighbor activators.The decay time of Ca5(PO4)2 SiO4:0,08 Sm^3+is determined to be 1.1957 ms.In addition,the effect of temperature on the emission intensity was also studied,72.4%of the initial intensity is still preserved at 250℃,better thermal stability compared to commercial phosphor YAG:Ce^3+indicates that Ca5(PO4)2SiO4:0.08 Sm^3+has excellent thermal stability and active energy is deduced to be 0.130 eV.All the results demonstrate that orange-red emitting Ca5(PO4)2SiO4:0.08 Sm3+phosphor exhibits good luminescent properties.Owing to the excellent thermal quenching luminescence property,Ca5(PO4)2SiO4:0.08 Sm^3+phosphor can be applied in n-UV white light emitting diodes and serve as the warm part of white light.A novel single-phase Sm3+ activated Ca5（PO4）2SiO4 phosphor was successfully fabricated via a conventional solid-state method, which can be e fficie ntly excited by near ultraviolet（n-UV） light-emitting chips.The crystal structure and luminescence properties were characterized and analyzed systematically by using relevant instruments. The Ca5（PO4）2SiO4:Sm3+ phosphor shows an orange-red emission peaking at600 nm under the excitation of 403 nm and the optimal doping concentration of Sm3+ is determined to be 0.08, The critical distance of Ca5（PO4）2SiO4:0.08 Sm3+ is calculated to be 1.849 nm and concentration quenching mechanism of the Sm3+ in Ca5（PO4）2SiO4 host is ascribed to energy transfer between nearestneighbor activators. The decay time of Ca5（PO4）2 SiO4: 0,08 Sm3+ is determined to be 1.1957 ms. In addition, the effect of temperature on the emission intensity was also studied, 72.4% of the initial intensity is still preserved at 250 ℃, better thermal stability compared to commercial phosphor YAG:Ce3+ indicates that Ca5（PO4）2SiO4:0.08 Sm3+ has excellent thermal stability and active energy is deduced to be 0.130 eV.All the results demonstrate that orange-red emitting Ca5（PO4）2SiO4:0.08 Sm3+ phosphor exhibits good luminescent properties. Owing to the excellent thermal quenching luminescence property,Ca5（PO4）2SiO4:0.08 Sm3+ phosphor can be applied in n-UV white light emitting diodes and serve as the warm part of white light.

关 键 词：Phosphors Ca5(PO4)2SiO4:Sm^3+ Luminescence Orange-red PHOSPHOR Rare earths 

分 类 号：TF[冶金工程]