Reactive SPS of Al_(2)O_(3)–RE:YAG(RE=Ce;Ce+Gd)composite ceramic phosphors  

作　　者：Denis Yu.Kosyanov Anastasia A.Vornovskikh 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 

机构地区：[1]Far Eastern Federal University,Vladivostok 690922,Russia [2]Institute of Automation and Control Processes,Far Eastern Branch of the Russian Academy of Sciences,Vladivostok 690041,Russia [3]Laboratory of Methods of Synchrotron Radiation,Institute of Solid State Chemistry and Mechanochemistry,Siberian Branch of the Russian Academy of Sciences,Novosibirsk 630128,Russia [4]Kamchatka Branch of Geophysical Survey of the Russian Academy of Sciences,Petropavlovsk-Kamchatsky 683006,Russia [5]Key Laboratory of Transparent Opto-functional Inorganic Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China [6]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Advanced Ceramics》2023年第5期1015-1032,共18页先进陶瓷（英文）

基　　金：supported by the Russian Science Foundation(No.20-73-10242);Also,this work was partially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA22010301);the International Partnership Program of Chinese Academy of Sciences(No.121631KYSB20200039);the International Cooperation Project of Shanghai Science and Technology Commission(No.20520750200);Denis Yu.Kosyanov is grateful to the Council on grants of the President of the Russian Federation(No.SP-3221.2022.1)for supporting the studies devoted to obtaining advanced ceramic materials;The SR XRD measurements were done at the shared research center SSTRC on the basis of the VEPP-4-VEPP-2000 complex at the Budker Institute of Nuclear Physics SB RAS.

摘　　要：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).

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 

分 类 号：TQ174.758.23[化学工程—陶瓷工业]