A ternary solid complex Lu(Et2dtc)3(phen) has been obtained from the reaction of hydrated lutetium chloride with sodium diethyldithiocarbamate (NaEt2dtc), and 1,10-phenanthroline (o-phen·H2O) in absolute ethanol....A ternary solid complex Lu(Et2dtc)3(phen) has been obtained from the reaction of hydrated lutetium chloride with sodium diethyldithiocarbamate (NaEt2dtc), and 1,10-phenanthroline (o-phen·H2O) in absolute ethanol. IR spectrum of the complex indicates that Lu3+ binds with sulfur atom in the Na(Et2dtc)3 and nitrogen atom in the o-phen. The enthalpy change of liquid-phase reaction of formation of the complex, △CHM- (l), was determined to be (-32.821 ± 0.147 ) kJ·mol-1 at 298.15 K by an RD-496 Ⅲ type heat conduction microcalormeter. The enthalpy change of the solid-phase reaction of formation of the complex, △CHM- (s), was calculated to be (104.160 ± 0.168) kJ · mol-1 on the basis of an appropriate thermochemistry cycle. The thermodynamics of liquid-phase reaction of formation of the complex was investigated by changing the temperature of liquid-phase reaction. Fundamental parameters, such as the activation enthalpy (△HM-), the activation entropy (?驻SM-), the activation free energy (△GM-), the apparent reaction rate constant (k), the apparent activation energy (E), the pre-exponential constant (A) and the reaction order (n), were obtained by combination the reaction thermodynamic and kinetic equations with the data of thermokinetic experiments. The molar heat capacity of the complex, cm, was determined to be (82.23 ± 1.47) J·mol-1·K-1 by the same microcalormeter. The constant-volume combustion energy of the complex, ΔcU, was determined as (-17 898.228 ± 8.59) kJ·mol-1 by an RBC-Ⅱtype rotating-bomb calorimeter at 298.15 K. Its standard enthalpy of combustion, △CHM-, and standard enthalpy of formation, △CHM-, were calculated to be (-17 917.43 ± 8.11) kJ·mol-1 and (-859.95 ±10.12) kJ·mol-1, respectively.展开更多
采用传统的熔融淬冷法在空气气氛下成功制备了Ce3+-Tb3+共掺的含有新型立方相Na Lu F4纳米晶的微晶玻璃.通过XRD分析可知微晶玻璃中析出的是与立方相Na YF4同构的新型立方相Na Lu F4纳米晶.利用TEM观察到纳米晶粒均匀地分布在玻璃基质中...采用传统的熔融淬冷法在空气气氛下成功制备了Ce3+-Tb3+共掺的含有新型立方相Na Lu F4纳米晶的微晶玻璃.通过XRD分析可知微晶玻璃中析出的是与立方相Na YF4同构的新型立方相Na Lu F4纳米晶.利用TEM观察到纳米晶粒均匀地分布在玻璃基质中,大小约为20 nm.利用荧光光谱及寿命曲线系统地研究了样品的荧光特性.在315 nm近紫外光激发下,通过有效的能量传递,在Ce3+-Tb3+共掺样品中不仅得到了Ce3+的近紫外光发射,还得到了Tb3+的黄绿光发射.另外,析晶之后,共掺样品的发光强度得到了增强,这可以归因于部分稀土离子进入到了析出的立方相Na Lu F4纳米晶中.研究结果表明,该微晶玻璃是一种优异的发光基质材料,在光电子领域中具有潜在的应用价值.展开更多
The article is based on a research on the adsorption behavior and adsorption mechanism of macroporous phosphonic acid resin (PAR) for Lu 3+ and the influence of the medium’s pH, adsorption temperature, adsorption tim...The article is based on a research on the adsorption behavior and adsorption mechanism of macroporous phosphonic acid resin (PAR) for Lu 3+ and the influence of the medium’s pH, adsorption temperature, adsorption time, etc on adsorbing Lu 3+ . The best value of medium’s pH to the adsorption of PAR for Lu 3+ was found to be 4.92. The static adsorption maximum capacity of PAR for Lu 3+ is 220?mg·g -1 . The thermodynamic adsorption parameters are respectively ΔH=11.3?kJ·mol -1 , ΔS=46.3?J·mol -1 ·K -1 , ΔG=-2.50?kJ·mol -1 and the apparent activity energy is E_a=31.4?kJ·mol -1 . The adsorption behavior of PAR for Lu 3+ obeys the Freundlich isotherm. The apparent adsorption rate constant is k_ 298 =4.68 ×10 -5 ?s -1 . The coordinate ratio of the functional radical to Lu 3+ is approximately 4∶1. The best eluant is 1.0?mol·L -1 HCl. The adsorption mechanism of PAR for Lu 3+ was separately confirmed by chemical analysis and IR spectra.展开更多
Highly efficient phosphors under vacuum ultraviolet excitation are still demanded for the development of plasma display panels and Hg-free fluorescent lamps. The phosphors of Eu3＋ doped （Y, Gd, Lu）BO3 were synthesi...Highly efficient phosphors under vacuum ultraviolet excitation are still demanded for the development of plasma display panels and Hg-free fluorescent lamps. The phosphors of Eu3＋ doped （Y, Gd, Lu）BO3 were synthesized with solid state reaction method and the contents of y3＋ Gd3＋, and Lu3＋ for plasma display panel red phosphor were optimized under vacuum ultraviolet excitation. Two new potential candidates, which were （Y1-S-TGdsLuT）BO3： Eu^3＋ （0〈S〈0.2, 0〈T〈0.1） and （GdlYJLuK）BO3： Eu3＋ （0.5〈I〈0.7, 0.2〈J〈0.4, 0〈K〈0.1）, were olgtained. The mechanism of luminescence improvement was discussed upon the analysis of crystal microstructure and excitation spectra.展开更多
Spray pyrolysis method was used to deposit Lutetium Oxide (Lu<sub>2</sub>O<sub>3</sub>) thin films using lutetium (III) chloride as source material and water as oxidizer. Annealing was carried ...Spray pyrolysis method was used to deposit Lutetium Oxide (Lu<sub>2</sub>O<sub>3</sub>) thin films using lutetium (III) chloride as source material and water as oxidizer. Annealing was carried out in argon atmosphere at 450°C for 60 minutes of the films. To investigate the composition and stoichiometry of sprayed as-deposited and annealed Lu<sub>2</sub>O<sub>3</sub> thin films, depth profile studies using X-ray photoelectron spectroscopy (XPS) was done. Nearly stoichiometric was observed for both annealed and as-deposited films in inner and surface layers.展开更多
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
文摘A ternary solid complex Lu(Et2dtc)3(phen) has been obtained from the reaction of hydrated lutetium chloride with sodium diethyldithiocarbamate (NaEt2dtc), and 1,10-phenanthroline (o-phen·H2O) in absolute ethanol. IR spectrum of the complex indicates that Lu3+ binds with sulfur atom in the Na(Et2dtc)3 and nitrogen atom in the o-phen. The enthalpy change of liquid-phase reaction of formation of the complex, △CHM- (l), was determined to be (-32.821 ± 0.147 ) kJ·mol-1 at 298.15 K by an RD-496 Ⅲ type heat conduction microcalormeter. The enthalpy change of the solid-phase reaction of formation of the complex, △CHM- (s), was calculated to be (104.160 ± 0.168) kJ · mol-1 on the basis of an appropriate thermochemistry cycle. The thermodynamics of liquid-phase reaction of formation of the complex was investigated by changing the temperature of liquid-phase reaction. Fundamental parameters, such as the activation enthalpy (△HM-), the activation entropy (?驻SM-), the activation free energy (△GM-), the apparent reaction rate constant (k), the apparent activation energy (E), the pre-exponential constant (A) and the reaction order (n), were obtained by combination the reaction thermodynamic and kinetic equations with the data of thermokinetic experiments. The molar heat capacity of the complex, cm, was determined to be (82.23 ± 1.47) J·mol-1·K-1 by the same microcalormeter. The constant-volume combustion energy of the complex, ΔcU, was determined as (-17 898.228 ± 8.59) kJ·mol-1 by an RBC-Ⅱtype rotating-bomb calorimeter at 298.15 K. Its standard enthalpy of combustion, △CHM-, and standard enthalpy of formation, △CHM-, were calculated to be (-17 917.43 ± 8.11) kJ·mol-1 and (-859.95 ±10.12) kJ·mol-1, respectively.
文摘采用传统的熔融淬冷法在空气气氛下成功制备了Ce3+-Tb3+共掺的含有新型立方相Na Lu F4纳米晶的微晶玻璃.通过XRD分析可知微晶玻璃中析出的是与立方相Na YF4同构的新型立方相Na Lu F4纳米晶.利用TEM观察到纳米晶粒均匀地分布在玻璃基质中,大小约为20 nm.利用荧光光谱及寿命曲线系统地研究了样品的荧光特性.在315 nm近紫外光激发下,通过有效的能量传递,在Ce3+-Tb3+共掺样品中不仅得到了Ce3+的近紫外光发射,还得到了Tb3+的黄绿光发射.另外,析晶之后,共掺样品的发光强度得到了增强,这可以归因于部分稀土离子进入到了析出的立方相Na Lu F4纳米晶中.研究结果表明,该微晶玻璃是一种优异的发光基质材料,在光电子领域中具有潜在的应用价值.
文摘The article is based on a research on the adsorption behavior and adsorption mechanism of macroporous phosphonic acid resin (PAR) for Lu 3+ and the influence of the medium’s pH, adsorption temperature, adsorption time, etc on adsorbing Lu 3+ . The best value of medium’s pH to the adsorption of PAR for Lu 3+ was found to be 4.92. The static adsorption maximum capacity of PAR for Lu 3+ is 220?mg·g -1 . The thermodynamic adsorption parameters are respectively ΔH=11.3?kJ·mol -1 , ΔS=46.3?J·mol -1 ·K -1 , ΔG=-2.50?kJ·mol -1 and the apparent activity energy is E_a=31.4?kJ·mol -1 . The adsorption behavior of PAR for Lu 3+ obeys the Freundlich isotherm. The apparent adsorption rate constant is k_ 298 =4.68 ×10 -5 ?s -1 . The coordinate ratio of the functional radical to Lu 3+ is approximately 4∶1. The best eluant is 1.0?mol·L -1 HCl. The adsorption mechanism of PAR for Lu 3+ was separately confirmed by chemical analysis and IR spectra.
基金supported by the Special Foundation of Hefei University of Technology for Doctor Degree Staff (103-036402)the Postdoctoral Research Fellow of Materials Science and Engineering of Hefei University of Technology (103-035038)
文摘Highly efficient phosphors under vacuum ultraviolet excitation are still demanded for the development of plasma display panels and Hg-free fluorescent lamps. The phosphors of Eu3＋ doped （Y, Gd, Lu）BO3 were synthesized with solid state reaction method and the contents of y3＋ Gd3＋, and Lu3＋ for plasma display panel red phosphor were optimized under vacuum ultraviolet excitation. Two new potential candidates, which were （Y1-S-TGdsLuT）BO3： Eu^3＋ （0〈S〈0.2, 0〈T〈0.1） and （GdlYJLuK）BO3： Eu3＋ （0.5〈I〈0.7, 0.2〈J〈0.4, 0〈K〈0.1）, were olgtained. The mechanism of luminescence improvement was discussed upon the analysis of crystal microstructure and excitation spectra.
文摘Spray pyrolysis method was used to deposit Lutetium Oxide (Lu<sub>2</sub>O<sub>3</sub>) thin films using lutetium (III) chloride as source material and water as oxidizer. Annealing was carried out in argon atmosphere at 450°C for 60 minutes of the films. To investigate the composition and stoichiometry of sprayed as-deposited and annealed Lu<sub>2</sub>O<sub>3</sub> thin films, depth profile studies using X-ray photoelectron spectroscopy (XPS) was done. Nearly stoichiometric was observed for both annealed and as-deposited films in inner and surface layers.
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。
