实现高发光效率、高亮度和良好的热稳定性是固态照明的迫切要求。因此,用于高功率发光二极管或激光二极管(LED/LD)的高性能荧光转换材料具有重要的研究意义。在这项工作中,通过将Lu^(3+)离子引入YAG∶Ce荧光陶瓷中方法作为有效策略来改...实现高发光效率、高亮度和良好的热稳定性是固态照明的迫切要求。因此,用于高功率发光二极管或激光二极管(LED/LD)的高性能荧光转换材料具有重要的研究意义。在这项工作中,通过将Lu^(3+)离子引入YAG∶Ce荧光陶瓷中方法作为有效策略来改善YAG∶Ce荧光材料的发光性能。采用固相反应和真空烧结法制Article ID:1000-7032(2023)06-0964^(-1)1收稿日期:2022^(-1)2-31;修订日期:2023-01-30基金项目:中国科学院战略性先导科技专项(XDA22010301)Supported by The Strategic Priority Research Program of The Chinese Academy of Sciences(XDA22010301)第6 HUANG Xinyou期,et al.:LuYAG∶Ce Transparent Ceramic Phosphors for High-brightness Solid-state…备了不同Lu^(3+)含量的(Lu,Y)_(3)Al_(5)O_(12)∶Ce荧光陶瓷(LuYAG∶Ce荧光陶瓷)。随着Lu^(3+)含量的增加,LuYAG∶Ce荧光陶瓷中的Y^(3+)位点被Lu^(3+)位点取代,Ce^(3+)的发射峰呈现从573 nm到563 nm的蓝移现象。当Lu^(3+)含量为60%时,通过将LuYAG∶Ce荧光陶瓷与蓝光LED组合,其发光强度达到最大值,流明效率达到114 lm∙W^(-1)。使用450 nm激光源与LuYAG∶Ce荧光陶瓷构建了透射模式下的激光驱动照明装置。随着功率密度从2.2 W·mm^(-2)增加到39 W·mm^(-2),Lu^(3+)含量为60%的荧光陶瓷光通量从128 lm增加到1874 lm,且没有发光饱和的迹象,最佳发光效率达到128 lm·W^(-1)。因此,LuYAG∶Ce荧光陶瓷有望成为高功率LED/LD照明的潜在荧光转换材料。展开更多
A new sodium indium phosphate Na 6In 4[P 7O 24(OH) 5]·4H 2O was synthesized under a mild hydrothermal condition and its structure was determined by means of single-crystal X-ray diffraction methods. The title com...A new sodium indium phosphate Na 6In 4[P 7O 24(OH) 5]·4H 2O was synthesized under a mild hydrothermal condition and its structure was determined by means of single-crystal X-ray diffraction methods. The title compound crystallizes in a hexagonal system, space group P6 3, with a= 0.950 23(5) nm, b=0.950 23(5) nm, c=1.694 2(2) nm, α=90°, β=90°, γ=120°, V=1.324 8(2) nm 3, Z=8, structure refined to R=0.052 8 and wR=0.116 5 for 2 134 independent observed reflections. The three-dimensional network structure consists of helical chains formed by apex-sharing polyhedra. The connection of the chains results in 4- and 8-polyhedral rings and cages centered by three indium metal connecting oxygen atoms formed by three 4-rings. The three-connected oxygen atom is firstly observed in indium phosphate systems.展开更多
The title new compounds with chemical formula RE CuBi_2 were synthesized by arc melting method followed by annealing. The crystal structures refined using Rietveld method and X-ray powder diffraction data show to be i...The title new compounds with chemical formula RE CuBi_2 were synthesized by arc melting method followed by annealing. The crystal structures refined using Rietveld method and X-ray powder diffraction data show to be isotypic to CaMnBi_2 structure type with space group P4/nmm(No.129). The unit cell parameters are a=(0.457946(4)nm),c=0.98858(2)nm, V=0.207319(8)nm^3 for LaCuBi_2, a=0.449279(9)nm, c= 0.95958(4)nm, V= 0.19369(2)nm^3 for GdCuBi_2 and a=0.447680(7)nm, c=0.95124(3)nm,V=0.190644(5)nm^3 for DyCuBi_2 respectively, showing lanthanide contraction. The structure is characterized by layers of edge-shearing CuBi_4 tetrahedron and covalently bonded Bi square net separated by rare earth atoms.展开更多
The title new compounds with chemical formula RNiBi_2 were synthesized by arc melting method followed by annealing. The crystal structures refined using Rietveld method and X-ray powder diffraction data show to be iso...The title new compounds with chemical formula RNiBi_2 were synthesized by arc melting method followed by annealing. The crystal structures refined using Rietveld method and X-ray powder diffraction data show to be isotypic to CaMnBi_2 structure type with space group P4/nmm (No.129). The unit cell parameters are LaNiBi_2: a=0.454238(2) nm, c=0.96845(3) nm, V=0.199822(3) nm3; PrNiBi_2: a=0.452714(7) nm, c=0.95754(4) nm, V=0.196248(1) nm3; NdNiBi_2: a=0.452435(2) nm, c=0.95530(3) nm, V=0.195516(2) nm3; SmNiBi_2: a=0.450073(5) nm, c=0.94292(3) nm, V=0.191003(1) nm3; respectively, showing lanthanide contraction. The structure was characterized by layers of edge-shearing NiBi_4 tetrahedron and covalently bonded Bi square net separated by rare earth atoms.展开更多
通过在不同矿化剂粉末[六亚甲基四胺(hexamethylenetetramine,HMT)、尿素和氢氧化锂]存在下的水热反应制备得到具有不同形貌尺寸的ZnO粉体,通过X射线衍射、扫描电子显微镜、紫外可见漫反射光谱和表面光电压谱研究了不同矿化剂存在下所制...通过在不同矿化剂粉末[六亚甲基四胺(hexamethylenetetramine,HMT)、尿素和氢氧化锂]存在下的水热反应制备得到具有不同形貌尺寸的ZnO粉体,通过X射线衍射、扫描电子显微镜、紫外可见漫反射光谱和表面光电压谱研究了不同矿化剂存在下所制备ZnO的尺寸、形貌和光电性能。结果表明:以HMT和LiOH作矿化剂可得到六方纤锌矿结构的ZnO粉体,且尺寸均一;尿素作矿化剂得到产物的结晶性较差;在LiOH存在下制备的ZnO具有明显的光电响应性能,这与带带跃迁及激子跃迁相关的。将所制备的ZnO用于染料敏化太阳能电池中,作为TiO2基染料敏化太阳能电池(dye-sensitized solar cells,DSSCs)光阳极的上层膜,起光散射作用,下层是纳米TiO2晶膜。作为对比,制备了单一ZnO基DSSCs。通过光电流-电压(I-V)曲线研究了2种DSSCs的光电转换效率,结果表明:TiO2/ZnO双层膜光阳极组装的DSSCs的光电性能优于ZnO基DSSCs,说明具有光散射层的DSSCs的光吸收增强归因于下层TiO2纳米晶膜的高比表面积和上层大尺寸ZnO光散射膜的组合效应。展开更多
High transparency in visible region was required for red-light-emitting Y2O3:Eu3+ thin film phosphors. Such films were obtained via chemical bath deposition on bare SiO2 glass substrates through heterogeneous nucleati...High transparency in visible region was required for red-light-emitting Y2O3:Eu3+ thin film phosphors. Such films were obtained via chemical bath deposition on bare SiO2 glass substrates through heterogeneous nucleation with further heat treatment. Thin amorphous yttrium basic carbonate films could be completely transformed to crystalline Y2O3 at 650 °C. X-ray diffraction and field-emission scanning electron microscopy were used to characterize these products. The deposition temperature and the post-anneali...展开更多
A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies...A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies were synthesized with a homogenous precipitation method in aqueous solution without any surfactant. Y2O3 samples with well-preserved morphological architectures were obtained by a subse-quent thermal transformation strategy. The chemical formula of the precursor was identified and a two-stage growth mechanism was proposed. The effects of the aging time, reaction temperature, reactant concentration and molar ratio of yttrium nitrate to sodium citrate were discussed. The photoluminescence properties of the Y2O3：Eu3＋ microspheres, microflowers and microsheets prepared were also studied.展开更多
文摘实现高发光效率、高亮度和良好的热稳定性是固态照明的迫切要求。因此,用于高功率发光二极管或激光二极管(LED/LD)的高性能荧光转换材料具有重要的研究意义。在这项工作中,通过将Lu^(3+)离子引入YAG∶Ce荧光陶瓷中方法作为有效策略来改善YAG∶Ce荧光材料的发光性能。采用固相反应和真空烧结法制Article ID:1000-7032(2023)06-0964^(-1)1收稿日期:2022^(-1)2-31;修订日期:2023-01-30基金项目:中国科学院战略性先导科技专项(XDA22010301)Supported by The Strategic Priority Research Program of The Chinese Academy of Sciences(XDA22010301)第6 HUANG Xinyou期,et al.:LuYAG∶Ce Transparent Ceramic Phosphors for High-brightness Solid-state…备了不同Lu^(3+)含量的(Lu,Y)_(3)Al_(5)O_(12)∶Ce荧光陶瓷(LuYAG∶Ce荧光陶瓷)。随着Lu^(3+)含量的增加,LuYAG∶Ce荧光陶瓷中的Y^(3+)位点被Lu^(3+)位点取代,Ce^(3+)的发射峰呈现从573 nm到563 nm的蓝移现象。当Lu^(3+)含量为60%时,通过将LuYAG∶Ce荧光陶瓷与蓝光LED组合,其发光强度达到最大值,流明效率达到114 lm∙W^(-1)。使用450 nm激光源与LuYAG∶Ce荧光陶瓷构建了透射模式下的激光驱动照明装置。随着功率密度从2.2 W·mm^(-2)增加到39 W·mm^(-2),Lu^(3+)含量为60%的荧光陶瓷光通量从128 lm增加到1874 lm,且没有发光饱和的迹象,最佳发光效率达到128 lm·W^(-1)。因此,LuYAG∶Ce荧光陶瓷有望成为高功率LED/LD照明的潜在荧光转换材料。
文摘A new sodium indium phosphate Na 6In 4[P 7O 24(OH) 5]·4H 2O was synthesized under a mild hydrothermal condition and its structure was determined by means of single-crystal X-ray diffraction methods. The title compound crystallizes in a hexagonal system, space group P6 3, with a= 0.950 23(5) nm, b=0.950 23(5) nm, c=1.694 2(2) nm, α=90°, β=90°, γ=120°, V=1.324 8(2) nm 3, Z=8, structure refined to R=0.052 8 and wR=0.116 5 for 2 134 independent observed reflections. The three-dimensional network structure consists of helical chains formed by apex-sharing polyhedra. The connection of the chains results in 4- and 8-polyhedral rings and cages centered by three indium metal connecting oxygen atoms formed by three 4-rings. The three-connected oxygen atom is firstly observed in indium phosphate systems.
文摘The title new compounds with chemical formula RE CuBi_2 were synthesized by arc melting method followed by annealing. The crystal structures refined using Rietveld method and X-ray powder diffraction data show to be isotypic to CaMnBi_2 structure type with space group P4/nmm(No.129). The unit cell parameters are a=(0.457946(4)nm),c=0.98858(2)nm, V=0.207319(8)nm^3 for LaCuBi_2, a=0.449279(9)nm, c= 0.95958(4)nm, V= 0.19369(2)nm^3 for GdCuBi_2 and a=0.447680(7)nm, c=0.95124(3)nm,V=0.190644(5)nm^3 for DyCuBi_2 respectively, showing lanthanide contraction. The structure is characterized by layers of edge-shearing CuBi_4 tetrahedron and covalently bonded Bi square net separated by rare earth atoms.
文摘The title new compounds with chemical formula RNiBi_2 were synthesized by arc melting method followed by annealing. The crystal structures refined using Rietveld method and X-ray powder diffraction data show to be isotypic to CaMnBi_2 structure type with space group P4/nmm (No.129). The unit cell parameters are LaNiBi_2: a=0.454238(2) nm, c=0.96845(3) nm, V=0.199822(3) nm3; PrNiBi_2: a=0.452714(7) nm, c=0.95754(4) nm, V=0.196248(1) nm3; NdNiBi_2: a=0.452435(2) nm, c=0.95530(3) nm, V=0.195516(2) nm3; SmNiBi_2: a=0.450073(5) nm, c=0.94292(3) nm, V=0.191003(1) nm3; respectively, showing lanthanide contraction. The structure was characterized by layers of edge-shearing NiBi_4 tetrahedron and covalently bonded Bi square net separated by rare earth atoms.
文摘通过在不同矿化剂粉末[六亚甲基四胺(hexamethylenetetramine,HMT)、尿素和氢氧化锂]存在下的水热反应制备得到具有不同形貌尺寸的ZnO粉体,通过X射线衍射、扫描电子显微镜、紫外可见漫反射光谱和表面光电压谱研究了不同矿化剂存在下所制备ZnO的尺寸、形貌和光电性能。结果表明:以HMT和LiOH作矿化剂可得到六方纤锌矿结构的ZnO粉体,且尺寸均一;尿素作矿化剂得到产物的结晶性较差;在LiOH存在下制备的ZnO具有明显的光电响应性能,这与带带跃迁及激子跃迁相关的。将所制备的ZnO用于染料敏化太阳能电池中,作为TiO2基染料敏化太阳能电池(dye-sensitized solar cells,DSSCs)光阳极的上层膜,起光散射作用,下层是纳米TiO2晶膜。作为对比,制备了单一ZnO基DSSCs。通过光电流-电压(I-V)曲线研究了2种DSSCs的光电转换效率,结果表明:TiO2/ZnO双层膜光阳极组装的DSSCs的光电性能优于ZnO基DSSCs,说明具有光散射层的DSSCs的光吸收增强归因于下层TiO2纳米晶膜的高比表面积和上层大尺寸ZnO光散射膜的组合效应。
基金Project supported by the National Basic Research Program of China (2007CB936704)Major Basic Research Program of Shanghai (07DJ14001)+2 种基金"Pujiang Talent Project" of Shanghai Science and Technology Committee (09PJ1410600)Innovation Group for the Ministry of Science and Technology of ChinaPHD Innovation Program 2009 by NSRL of Ministry of Education
文摘High transparency in visible region was required for red-light-emitting Y2O3:Eu3+ thin film phosphors. Such films were obtained via chemical bath deposition on bare SiO2 glass substrates through heterogeneous nucleation with further heat treatment. Thin amorphous yttrium basic carbonate films could be completely transformed to crystalline Y2O3 at 650 °C. X-ray diffraction and field-emission scanning electron microscopy were used to characterize these products. The deposition temperature and the post-anneali...
基金Project supported by the National Natural Science Foundation of China (50990304)State "973" Project (2007CB936704)
文摘A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies were synthesized with a homogenous precipitation method in aqueous solution without any surfactant. Y2O3 samples with well-preserved morphological architectures were obtained by a subse-quent thermal transformation strategy. The chemical formula of the precursor was identified and a two-stage growth mechanism was proposed. The effects of the aging time, reaction temperature, reactant concentration and molar ratio of yttrium nitrate to sodium citrate were discussed. The photoluminescence properties of the Y2O3：Eu3＋ microspheres, microflowers and microsheets prepared were also studied.
