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Synthesis of YAG∶Ce^(3+) Phosphor by Polyacrylamide Gel Method and Promoting Action of α-Al_2O_3 Seed Crystal on Phase Formation 被引量:5
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作者 李永绣 李颖毅 +4 位作者 闵宇霖 吴燕利 程昌明 周雪珍 辜子英 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第5期517-520,共4页
YAG: Ce^3 + phosphor particles were prepared using polyacrylamide gel method. The structure evolution of powders during annealing process was followed by X-ray diffraction determination. It is found that some interm... YAG: Ce^3 + phosphor particles were prepared using polyacrylamide gel method. The structure evolution of powders during annealing process was followed by X-ray diffraction determination. It is found that some intermediate phases, including θ-Al2O3, YAM and YAP, are formed when calcining polyacrylamide gel, however, the pure YAG phase can be formed directly when calcining polyacrylamide gel with α-Al2O3 as seed crystal. These facts show that the existence of α- Al2O3 seed crystal can block the formation of θ-Al2O3, YAM and YAP, and accelerate its reaction with Y2O3 to form YAG phase directly at lower temperature. The emission peak of prepared YAG : Ce^3 + phosphor is wide with maximum at 550 nm and the exitation band has two peaks, the major one is around at 460 nm, which matches the blue emission of GaN LED and is suitable for the assemble of white LED. Some fluxes can enhance the photoluminescence intensity of phosphor particles, that can be attributed both to the improvement of crystallization processes of YAG and to the stabilization of trivalence cerium ion in YAG:Ce^3 +. 展开更多
关键词 yag Ce^3 phosphor polyacrylamide gel α-Al2O3 seed crystal phase formation rare earths
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YAG:Ce^(3+)超细荧光粉的合成与发光性质的研究
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作者 梁娜 李宗珊 +1 位作者 吴尚进 李艳红 《沈阳化工学院学报》 2008年第3期226-230,共5页
采用溶胶-凝胶法,以柠檬酸为络合剂,乙二醇为螯合剂合成了YAG:Ce3+超细荧光粉.利用X射线衍射、电镜和荧光光谱等测试手段对合成的YAG:Ce3+样品的结构、形貌和发光性质进行了研究.XRD图谱结果表明:所有样品均为立方相.根据Scherrer公式计... 采用溶胶-凝胶法,以柠檬酸为络合剂,乙二醇为螯合剂合成了YAG:Ce3+超细荧光粉.利用X射线衍射、电镜和荧光光谱等测试手段对合成的YAG:Ce3+样品的结构、形貌和发光性质进行了研究.XRD图谱结果表明:所有样品均为立方相.根据Scherrer公式计算,900℃、1 000℃和1 100℃热处理后样品晶粒的平均粒径分别为69 nm7、2 nm和89 nm.粒子的粒径和衍射峰强度随热处理温度的提高而增大和增强.激发光谱由位于345 nm的弱激发带和位于470 nm强的激发带组成.发射光谱是位于530 nm左右的宽的发射带,归属于Ce3+离子的5d→4f跃迁.激发和发射强度随热处理温度的提高而增强. 展开更多
关键词 yag:Ce^3+超细荧光粉 溶胶-凝胶法 发光性质
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Reactive SPS of Al_(2)O_(3)–RE:YAG(RE=Ce;Ce+Gd)composite ceramic phosphors 被引量:1
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作者 Denis Yu.Kosyanov Anastasia A.Vornovskikh +11 位作者 Oleg O.Shichalin Evgeniy K.Papynov Anton A.Belov Aleksandra A.Kosianova Aleksandr N.Fedorets Andrei A.Leonov Alexey P.Zavjalov Sergey A.Tikhonov Yanbin Wang Ziqiu Cheng Xin Liu Jiang Li 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第5期1015-1032,共18页
Ultrafine-grained Al_(2)O_(3)–rare earth:yttrium aluminium garnet(Al_(2)O_(3)–RE:YAG)(RE=Ce;Ce+Gd)composite ceramics were obtained for the first time by reactive spark plasma sintering(SPS)using commercially availab... Ultrafine-grained Al_(2)O_(3)–rare earth:yttrium aluminium garnet(Al_(2)O_(3)–RE:YAG)(RE=Ce;Ce+Gd)composite ceramics were obtained for the first time by reactive spark plasma sintering(SPS)using commercially available initial oxide powders.The effect of key sintering parameters(temperature,dwell time,and external pressure(P_(load)))on densification peculiarities,structural-phase states,and luminescent properties of composites was studied comprehensively.Differences in phase formation and densification between Ce-doped and Ce,Gd-codoped systems were shown.Parameters of reactive SPS,at which there is partial melting with the formation of near-eutectic zones of the Al_(2)O_(3)–YAG system/coexistence of several variations of the YAG-type phase,were established.Pure corundum–garnet biphasic ceramics with an optimal balance between microstructural and luminescence performance were synthesized at 1425℃/30 min/30–60 MPa.The external quantum efficiency(EQE)of the phosphor converters reached 80.7%and 72%with close lifetime of~63.8 ns,similar to those of commercial Ce:YAG materials,which is promising for further applications in the field of high-power white light-emitting diodes(WLEDs)and laser diodes(LDs). 展开更多
关键词 alumina–Ce^(3+)-doped yttrium aluminium garnet(Al_(2)O_(3)–Ce:yag)ceramic phosphors reactive spark plasma sintering(SPS) structural-phase states microstructure luminescence performance
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Photoluminescence and energy transfer of YAG:Ce^(3+),Gd^(3+),Bi^(3+)
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作者 Meidan Que Wenxiu Que +2 位作者 Ting Zhou Jinyou Shao Lingbing Kong 《Journal of Advanced Dielectrics》 CAS 2016年第4期31-36,共6页
In this study,Gd^(3+)and Bi^(3+)ions act to redshift the emission band to orange region,and to enhance significantly the maximum emission of YAG:Ce^(3+).On account that size mismatch between the host and the doped Gd^... In this study,Gd^(3+)and Bi^(3+)ions act to redshift the emission band to orange region,and to enhance significantly the maximum emission of YAG:Ce^(3+).On account that size mismatch between the host and the doped Gd^(3+)ion,the crystal structure turns soft,and the emission spectra are not tuned from 540 to 570 nm but decreased the emission intensity.Accordingly,an effective way to increase emission intensity is to introduce Bi^(3+)ion into the YAG:Ce^(3+),Gd^(3+)phosphors.Experimental results show partial overlapping between the emission band of Bi^(3+)ion and the excitation band of Ce^(3+)ion,indicating that the energy transfer from Bi^(3+)to Ce^(3+)ions exists in the(Y_(1.94)Ce_(0.06)Gd)Al_(5)O_(12):Bi^(3+)phosphor.Bi^(3+)ion can serve as the activator to provide energy for Ce^(3+)ion via cross relaxation phenomenon.Therefore,the(Y_(1.94)Ce_(0.06)Gd)Al_(5)O_(12):Bi^(3+)phosphor could have potential applications in warm white LEDs. 展开更多
关键词 yag:Ce^(3+) Gd^(3+) Bi^(3+)phosphor energy transfer reabsorption.
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