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Citrate sol-gel combustion preparation and photoluminescence properties of yag:ce phosphors

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Journal of Rare Earths 2012年第4期30卷 289-296页

作者：张乐陆洲朱金振杨浩韩朋德陈雁张其土 College of Materials Science and Engineering Nanjing University of Technology

Yellow-emitting yag：ce3＋ nanocrystalline phosphors were prepared by citrate sol-gel combustion method using citric acid as the fuel and chelating agent. The influence of mole ratio of citric acid to metallic ions （MRCM）, pH value of the solution, calcination temperature and ce-doped concentration on the structures and properties of as-prepared powders were investigated in detail. Higher crystallinity and better luminescence performance powders were obtained at MRCM=2, pH=3 and the calcination temperature of 1200 ℃. The phosphors exhibited the charactefistc broadband visible luminescence of yag：ce. The optimum concentration of ce3＋ was 1.0 tool.%, and the concentration quenching was derived from the reciprocity between electric dipole and electric quadrupole （d-q）. Especially, the pH value of the solution was a key factor to obtain a stable sol-gel system and then obtain pure and homogeneous rare earth ions doped yag phosphors at a lower tem- perature. The Y3Al5O12：ce0.03 phosphor with optimized synthesis-condition and composition had a similar luminescence intensity with the commercial phosphor yag：ce.

关键词： yag:ce sol-gel combustion method photoluminescence phosphors concentration quenching rare earths

Carbon interstitial defects causing emission red shift in yag:ce phosphor:First-principles calculation

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Journal of Rare Earths 2018年第12期36卷 1239-1244页

作者： Yaling Zheng Weidong Zhuang Xianran Xing Ronghui Liu Yanfeng Li Yuanhong Liu Yunsheng Hu Xiaoxia Chen Lei Chen Xiaole Ma National Engineering Research center for Rare Earth Materials General Research Institute for Nonferrous Metals and Grirem Advanced Materials Co.Ltd. Department of Physical Chemistry University of Science & Technology Beijing

Y3Al5O12:ce3+ is the most famous phosphor material due to its excellent photolumincent ***,through first-principles calculation,the effect of carbon interstitial defects on Y3Al5O12:ce3+phosphor was investigated. It is found that the carbon interstitials tend to occupy the next-nearest sites of ce3+ion in Y3Al5O12:ce3+ lattice. Specially,these interstitial defects can shorten the ce3+-O2-bond length, leading to a larger crystal field splitting of 5 d orbital of the ce3+atom and bigger 5 d centroid *** two factors cause the emission spectrum of Y3Al5O12(C):ce3+red shift compared with that of Y3Al5O12:ce3+. Moreover, with our comparison experiment, we find that the Y3Al5O12(C):ce3+ has an obvious red shift compared with that of Y3Al5O12:ce3+system,which is in accord with our first principles calculation. Our work systematically investigates the impact of the carbon interstitial defect on Y3Al5O12:ce3+,and provides a new route to tune the emission spectrum in Y3Al5O12:ce3+.

关键词： yag:ce Carbon interstitial defects Red shift First-principles calculation Rare earths

A novel method for the synthesis of yag:ce phosphor

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Journal of Rare Earths 2009年第6期27卷 886-890页

作者：高文贵胡运生庄卫东张书生刘元红何华强 National Engineering Research center for Rare Earth Materials General Research Institute for Nonferrous Metalsand Grirem Advanced Materials Co.Ltd.

yag:ce phosphor was synthesized by a novel simple method,wherein the admixture of three raw materials(Y2O3,α-Al2O3 and ceO2) were first acidified by diluted nitric acid to prepare a precursor,followed by a high temperature heating treatment of the obtained precursor under reductive *** XRD measurement and SEM observation,it was found that Y2O3,one of the raw material,was firstly dissolved into the diluted nitric acid,and then recrystallized on the surface of both α-Al2O3 and ceO2 to form a no...

关键词： yag:ce nano-flaky hierarchical architecture acidification phosphor luminescence rare earths

Spectral Property and Thermal Quenching Behavior of Tb^(3+)-Doped yag:ce Phosphor

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Chinese Journal of Structural Chemistry 2016年第2期35卷 326-334页

作者： GUO Wang SHI Hong-Ling HUANG Ji-Quan DENG Zhong-Hua YUAN Xuan-Yi CAO Yong-Ge Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China Key Lab of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences

A series of yag：ce,Tb phosphors were synthesized by vacuum sintering ***,their spectral properties,thermal quenching behaviors and color rendering properties were investigated *** photoluminescence emission spectra of yag：ce,Tb show a great red shift compared with that of yag：*** energy transfer from Tb^（3＋） to ce^（3＋） ions is verified based on the analysis of different photoluminescence *** quenching temperature for Tb^（3＋）-doped yag：ce phosphors is about 490 *** thermal activation energy is estimated to be 0.18 and 0.291 eV for Tb^（3＋）-doped yag：ce and yag：ce phosphors,*** smaller activation energy for Tb^（3＋）-doped yag：ce means a more rapid nonradiative transition from 5d to 4f state,thus resulting in the lower quenching *** addition,white LEDs with improved color rendering properties are achieved by using modified yag：ce,Tb phosphors.

关键词： yag:ce Tb phosphors spectra properties thermal quenching white LEDs

yag∶ce荧光粉体的柠檬酸盐分解法制备和表征

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人工晶体学报 2007年第4期36卷 931-934页

作者：娄天军王天喜谷永庆张裕平张甲敏河南科技学院化学化工学院新乡453003

通过对柠檬酸盐分解法的改进,在800℃的低温下合成了yag:ce立方晶荧光粉体,用X-射线衍射法研究了yag的成相过程。结果表明:Y2O3与Al2O3的摩尔比为3.3:5时更易形成yag相,成相过程是由无定型态直接转变为yag相的。同时考察了样品的发光性质。

关键词： yag:ce 柠檬酸盐法荧光粉

yag：ce体系中稀土离子掺杂对ce^3＋的光谱性能的影响

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高等学校化学学报 2008年第4期29卷 673-676页

作者：孔丽甘树才洪广言尤洪鹏张吉林吉林大学化学学院长春130023 中国科学院长春应用化学研究所稀土资源利用国家重点实验室长春130022

采用高温固相法合成了一系列的(Y0.95Ln0.01ce0.04)3Al5O12(简称yag∶ce,Ln),系统地研究了此体系中的Ln3+对ce3+的发光强度的影响.结果表明,在yag∶ce的体系中,La3+,Gd3+,Lu3+等光学透明离子的少量掺杂对ce3+的发光强度的影响不大;掺入... 详细信息

采用高温固相法合成了一系列的(Y0.95Ln0.01ce0.04)3Al5O12(简称yag∶ce,Ln),系统地研究了此体系中的Ln3+对ce3+的发光强度的影响.结果表明,在yag∶ce的体系中,La3+,Gd3+,Lu3+等光学透明离子的少量掺杂对ce3+的发光强度的影响不大;掺入少量的Pr3+,Sm3+,Tb3+,Dy3+,Ho3+,Er3+,Tm3+等稀土离子,由于它们的能级与ce3+的能级有交叠,使它们之间存在着竞争吸收或能量转移,对ce3+的发光有较明显的变化,其中,Pr3+和Sm3+的掺入使其在红光区有发射峰,可以增加yag∶ce的红色成分以提高显色性;Nd3+,Eu3+和Yb3+对ce3+的发光有严重的猝灭作用.

关键词： yag:ce 白光LED Ln^3+ 光致发光

流延等静压成型法制备yag:ce荧光陶瓷:性能及应用

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中国稀土学报 2022年第4期40卷 609-615页

作者：曹坤汲长艳黄志粟慧娟伍丹何衡平湖南人文科技学院材料与环境工程学院精细陶瓷与粉体材料湖南省重点实验室湖南娄底417000 国家电子陶瓷产品质量监督检验中心(湖南) 湖南娄底417000

采用水基流延等静压成型工艺,结合高温固相烧结成功制备了yag:ce荧光陶瓷。为考察水基流延等静压成型工艺对yag:ce荧光陶瓷产品性能的影响,在平行条件下制备了非水基yag:ce荧光陶瓷。与非水基荧光陶瓷相比,采用水基流延等静压成型工艺... 详细信息

采用水基流延等静压成型工艺,结合高温固相烧结成功制备了yag:ce荧光陶瓷。为考察水基流延等静压成型工艺对yag:ce荧光陶瓷产品性能的影响,在平行条件下制备了非水基yag:ce荧光陶瓷。与非水基荧光陶瓷相比,采用水基流延等静压成型工艺制备的yag:ce荧光陶瓷的X射线衍射(XRD)衍射强度明显增强,样品粒径分布更均匀,荧光激发和发射强度明显增强,平均荧光寿命延长,热稳定性提高。因此,基于水基荧光陶瓷的白光,其显色指数(68.8)和发光效率(169.18 lm∙W^(-1))明显提升。本研究为水基和非水基流延等静压成型-高温固相烧结制备yag:ce荧光陶瓷的相关研究奠定了一定的理论和实验依据。

关键词： yag:ce 荧光陶瓷流延等静压成型固态激光照明

含硼助熔剂对yag∶ce荧光粉晶相、形貌及发光性能的影响

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人工晶体学报 2013年第11期42卷 2235-2240,2251页

作者：李聪明谭劲郑水林马米孙夏微中国地质大学材料与化学学院武汉430074

采用高温固相法分别以H3BO3和Na2B4O7作为助熔剂合成了ce离子掺杂的Y3Al5O12(yag∶ce)黄色荧光材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、荧光分光光度计(PL)对合成出的yag∶ce样品进行了表征,在此基础上研究了H3BO3和Na2B4O7... 详细信息

采用高温固相法分别以H3BO3和Na2B4O7作为助熔剂合成了ce离子掺杂的Y3Al5O12(yag∶ce)黄色荧光材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、荧光分光光度计(PL)对合成出的yag∶ce样品进行了表征,在此基础上研究了H3BO3和Na2B4O7助熔剂浓度对yag∶ce的晶相、微观形貌及光学性能的影响。结果表明,随着H3BO3的增加,发光强度先增大后降低,并且当H3BO3用量为1.5wt%时,发光强度达到最大,同时颗粒分散性最好;然而当增加Na2B4O7用量时,发光强度先增强再降低,晶体发育程度及颗粒分散性先改善再恶化,当用量为6.0wt%时,发光强度最大,颗粒分散性最优。此外,含硼助熔剂由于B离子的引入,有效地提高了yag晶体对发光中心ce离子的容纳量。H3BO3和Na2B4O7使ce离子猝灭浓度分别提高到了0.15和0.10。

关键词： yag:ce 荧光粉助熔剂 H3BO3 Na2B4O7

共沉淀-热处理工艺合成yag:ce^(3+)荧光粉的研究

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稀有金属材料与工程 2008年第A2期37卷 426-429页

作者：蒋继峰周少华张朋越洪樟连浙江大学材料科学与工程学系浙江杭州310027

采用共沉淀法制备Y3Al5O12:ce3+(yag:ce3+)荧光体前驱粉末,采用差热分析(DTA)、傅里叶红外(FT-IR)、X-射线衍射(XRD)和荧光光谱(PL)等测试分析手段,对凝胶经不同温度烧成的Y3Al50.2:ce3+荧光粉的成相过程、晶体结构及其发光性能进行了... 详细信息

采用共沉淀法制备Y3Al5O12:ce3+(yag:ce3+)荧光体前驱粉末,采用差热分析(DTA)、傅里叶红外(FT-IR)、X-射线衍射(XRD)和荧光光谱(PL)等测试分析手段,对凝胶经不同温度烧成的Y3Al50.2:ce3+荧光粉的成相过程、晶体结构及其发光性能进行了测试与分析。DTA和XRD结果表明,经1200℃煅烧后,凝胶转变为单相性良好的yag立方相,空间群为Ia3d(230)。PL谱测试结果表明,煅烧热处理获得的yag:ce3+荧光粉的激发光谱由2个主峰位于340nm和469 nm的激发峰组成,分别对应于2F5/2→5D和2F7/2→—5D的跃迁;发射谱主峰位于537 nm,属于ce3+的5d→4f特征跃迁发射。不同ce掺杂浓度的yag:ce3+荧光粉的发光性能研究结果表明,随着ce掺杂浓度增加,荧光粉发光强度先增加后减小,呈现浓度淬灭现象,当x=0.06时,发光强度达到最大值。

关键词： yag:ce 荧光体共沉淀法