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Cerium-doped yttrium aluminium garnet (Y3Al5O12, YAG) samples were synthesized by the conventional solid state reaction method. The structure, photoluminescence and thermoluminescence properties were studied. The prepared samples are identified as pure garnet structure by the XRD results. The doping of a small amount of cerium ions has no influence on the structure of the host. Fluorescence spectra show that in the process of the preparation of Y2.95Al5O12 ∶Ce4+0.05 there is self reduction of Ce4+ when calcined in air, Which makes Y2.95Al5O12 ∶Ce4+0.05 emit yellow light peaking at 531 nm when excited by blue light, because a part of Ce4+ have been reduced into Ce3+. Y2.95Al5O12 ∶Ce3+0.05 prepared in weak reducing atmosphere has long yellow afterglow lasting for 35 minutes after it is excited by ultraviolet light. Thermoluminescence measurements show that YAG samples doped with Ce3+ can emit light at higher temperature. There are two obvious thermoluminescence peaks located at 112 ℃ and 256 ℃ in the thermoluminescence curve of Y2.95Al5O12 ∶Ce3+0.05 prepared in weak reducing atmosphore while there is only one located at 128 ℃ in the thermoluminescence curve of Y2.95Al5O12 ∶Ce4+0.05 prepared in air. A conclusion that the thermoluminescence of YAG ∶Ce3+ originates mainly from the Ce3+ trapped by defect energy level can be made out by comparing the cases of doped samples and the un-doped ones.
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Keywords:
- long afterglow /
- thermoluminescence at higher temperature /
- defect
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[1] Pan Y X,Wu M M,Su Q 2004 Mater. Sci. Eng. B 106 251
[2] Pan Y X,Wu M M,Su Q 2004 J. Phys. Chem. Solid 65 845
[3] Ho S J,Won B I,Dong C L,Duk,Y J,Shi S K 2007 J. Lumin. 126 371
[4] Kong L,Gan S C,Hong G Y,Zhang J L 2007 J. Rare Earth 25 692
[5] Xia G D,Zhou S M,Zhang J J,Xu J 2005 J. Cryst. Growth 279 357
[6] Fadlalla H.M.H.,Tang C C,Wei S Y,Ding X X 2008 J. Lumin. 128 1655
[7] Vladimir P,Larisa G,Donats M,Tadeusz C 2007 Radiat. Meas. 42 679
[8] Huang C H,Zhang Q L,Zhou D F,Wang A H,Yin S T,Shi C S 2003 J. Synth. Cryst. 32 295 (in Chinese) [黄朝红、张庆礼、周东方、王爱华、殷绍唐、施朝淑 2003 人工晶体学报 32 295]
[9] Shen L J,Zhao Z Q,Wan Z B,Zhou Y B,Li B,Zhang G B 2008 Chin. J. Lumin.29 269 (in Chinese) [沈雷军、赵增祺、万作波、周永勃、李 波、张国斌 2008 发光学报 29 269]
[10] Pei Z W,Su Q,Zhang J Y 1993 J. Alloys Compd. 198 51
[11] Su Q,Zeng Q H,Pei Z W 2000 Chin. J. Inorg. Chem. 16 293 (in Chinese) [苏 锵、曾庆华、裴治武 2000 无机化学学报 16 293]
[12] Su Q,Liang H B,Hu T D,Tao Y,Liu T 2002 J. Alloys Compd. 344 132
[13] Su Q,Li C Y,Wang J,Li J,Zhang Y L,Guo C F,Lv Y H 2005 Chin. J. Lumin.26 143 (in Chinese) [苏 锵、李成宇、王 静、李 娟、张彦立、郭崇峰、吕玉华 2005 发光学报 26 143]
[14] Sakai R,Katsumata T,Komuro S,Morikawa T 1999 J. Lumin. 85 149
[15] Yuan Z X,Chang C K,Mao D L,Ying W J 2004 J. Alloys Compd. 377 268
[16] Chen R,Wang Y H,Hu Y H,Hu Z F,Liu C 2008 J. Lumin. 128 1180
[17] Liu C,Wang Y H,Hu Y H,Chen R,Liao F 2007 J. Founc. Mater. 38 1952 (in Chinese) [柳 成、王银海、胡义华、陈 仁、廖 峰 2007 功能材料38 1952]
[18] Bos A J J 2007 Radiat. Meas. 41 S45
[19] Liu B,Shi C S,Wei Y G,Wu C,Li Y X,Hu G Q,Shen D Z 2000 Acta Phys. Sin. 49 2078 (in Chinese) [刘、波、 施朝淑、 魏亚光、 吴 灿、 李裕熊、 胡关钦、 沈定中 2000 49 2078]
[20] Liu B,Shi C S,Zhou D F,Qi Z M,Hu G Q,Tang H G 2001 Acta Phys. Sin. 50 1627 (in Chinese) [刘 波、 施朝淑、 周东方、 戚泽明、 胡关钦、 汤洪高 2001 50 1627]
[21] Zhan C X,Tang Q,Luo D L 2002 Acta Phys. Sin. 51 2881 (in Chinese) [张纯祥、唐 强、 罗达玲 2002 51 2881]
[22] Zhan C X,Lin L B,Liang B L,Tang Q,Li D H,Luo D L 2004 Acta Phys. Sin. 53 291 (in Chinese) [张纯祥、 林理彬、 梁宝鎏、 唐 强、 李德卉、 罗达玲 2004 53 291]
[23] Li C Y,Su Q,Qiu J R 2003 Chin. J. Lumin. 24 19(in Chinese) [李成宇、苏 锵、邱建荣 2003 发光学报 24 19]
[24] Luo X X,Yu J J,Lin G X,Xiao Z Q,Duan J X,Xiao Z G 2002 Chin. J. Lumin. 23 497 (in Chinese) [罗昔贤、于晶杰、林广旭、肖志强、段锦霞、肖志国 2002 发光学报 23 497]
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