【摘 要】
：
In wet chemical method for preparation of YAG∶Ce nano phosphor powders, the pH value of the reaction system delivers essential impact on the crystal size,
【机 构】
：
CollegeofChemistryandEnvironmentalEngineeringofShenzhenUniversity,ShenzhenP.R.China518060;ShenzhenKe
【出 处】
：
2016’中国溶胶-凝胶学术研讨会暨国际论坛
论文部分内容阅读
In wet chemical method for preparation of YAG∶Ce nano phosphor powders, the pH value of the reaction system delivers essential impact on the crystal size, calcination temperature, and dispersibility of the crystal powders.Nevertheless, systematic study on the impact of the pH value is absent.Through adjusting the ratio R of precipitant ammonium hydrocarbonate to the total metal ion in the solution, the pH value of the reaction could be controlled in the range of 4.1-8.3.Calcination temperatures of 1050 ℃ and 1300 ℃ were compared for their impact on the crystallization of YAG∶Ce nanophosphors.Acidic condition is more preferable for improved YAG∶Ce nanophosphors through XRD spectra analysis for the type of crystals and the crystal size.ICP-AES analysis was performed to determine that the molar ratio of Y3+ to Al3+ at R =1∶3 is close to the stoichiometric ratio of YAG∶Ce.SEM images showed the YAG∶Ce nanophors prepared at acidic condition having smaller crystal size and improved dispersibility.Consequently, theoretical knowledge could be proposed for further sintering of transparent ceramics.
其他文献
Nano-porous ployimide/silica composite aerogels derived from sol-gel process based on chemical and physical combination are introduced.On one hand, chemical
Carbon aerogels are potential super-thermal insulations for using in ultrahigh temperatures and in inert atmospheres.However, the mechanical properties and
Porous TiO2 have recently attracted a great deal of attentions owing to their high adsorption capacity and catalytic activity, and are widely used in many f
Resorcinol formaldehyde (RF) aerogels with graded density were fabricated via three methods: layer-by-layer gelation, sol-co-gelation and continuous formati
Y(NO3)3·6H2O, Al(NO3)3·9H2O and isopropanol (C3H8O) were used as raw materials to synthesize YAG nanoparticles by sol-gel method while hexamethylenetetram
本研究使用金-198标帜方法,呈现放射性纳米金粒子在生物分析化学、生物医学影像与生物体内放射治疗的多重应用.将前驱溶液送入核子反应器进行照射,经由中子捕获反应而形成金-
利用新型荧光纳米材料类石墨氮化碳纳米片1,2,开展了简单快速荧光检测水体中六价铬离子和抗坏血酸的研究.因为内滤作用,六价铬离子可有效地猝灭类石墨氮化碳纳米片的荧光.在
Porous C-NiO nanocomposite films has been prepared by one step polymerization induced phase separation process within the framework of sol-gel technique, ex
PbSe dendritic structures have been successfully synthesized by a facile hydrothermal route in glycerol solution without surfactant.Temperature, time, and P
Volatile organic compounds (VOCs) are greatly emitted from industrial production process, automobile exhaust emissions and human daily activities.Catalytic