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本文采用高温固相反应法制备了Ba5SiO4Cl6: Yb3+, Er3+, Li+ 荧光粉, 并对其上转换发光性质及其发光机理进行了研究. 在980 nm 激光的激发下, Ba5SiO4Cl6: Yb3+, Er3+ 荧光粉呈现较强的红色(662 nm) 和较弱的绿色(550 nm) 的上转换发光, 红色和绿色的上转换发光分别对应于Er3+ 离子的4S3/2/2H11/24I15/2 和4F9/24I15/2 跃迁, 且随着掺杂的Er3+ 和Yb3+ 离子浓度增加, 样品的上转换发光强度增加, 这是因为Yb3+ 离子和Er3+ 离子之间的能量传递效率增加引起的. 在0.50.8 W 功率激发下,样品属于双光子发射, 而在0.91.2 W 功率激发下样品具有新的上转换发光机理光子雪崩效应. 探讨了Li+ 掺杂对Ba5SiO4Cl6: Yb3+, Er3+ 样品的上转换发光性质的影响, Li+ 离子的掺杂引起Ba5SiO4Cl6:Yb3+, Er3+ 上转换发光强度增加, 这是由于Li+ 离子的掺入降低了晶体场的对称性引起的.The Ba5SiO4Cl6: Yb3+, Er3+, Li+ phosphor has been prepared by high temperature solid state reaction, and their upconversion (UC) luminescence properties and mechanisms are investigated. The UC emission bands located at 525 nm (2H11/24I15/2), 548 nm (4S3/24I15/2), and 662 nm (4F9/24I15/2) due to Er3+ are observed under the excitation of 980 nm. UC luminescence of Ba5SiO4Cl6: Yb3+, Er3+ phosphors is increased with increasing Er3+ and Yb3+ concentration due to the energy transfer enhancement of Er3+ and Yb3+. Based on the relations of UC luminescence intensity and excitation light power, the UC luminescence mechanisms are discussed. At a low excited power (below 0.8 W), the two-photon processes are involved in both green and red UC emission mechanisms. When the power exceeds 0.9 W, the green and red UC emission is a four-photon process. One new and interesting UC emission mechanism may occur in the Ba5SiO4Cl6: Yb3+, Er3+ phosphors. Both green and red UC emissions at a higher pumping power are generated by photon avalanche UC process. Influence of Li+ doping on the UC luminescence of Ba5SiO4Cl6: Yb3+, Er3+ phosphors is investigated. Result demonstrates that Li+ ion doping could enhance the UC luminescence of Ba5SiO4Cl6: Yb3+, Er3+, which is attributed to the distortion of the local symmetry around Er3+.
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Keywords:
- upconversion luminescence /
- Ba5SiO4Cl6: Yb3+ /
- Er3+ /
- Li+ /
- phosphors /
- photon avalanche
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[1] Yang Y M, Jiao F Y, Su H X, Li Z Q, Jiao J P, Liu Y F, Li Z Q 2012 Chin. J. Lumin. 33 1319 (in Chinese) [杨艳民, 焦福运, 苏红新, 李自强, 焦金鹏, 刘云峰, 李志强 2012 发光学报 33 1319]
[2] Wang M, Hou W, Mi C C, Wang W X, Xu Z R, Teng H H, Mao C B, Xu S K 2009 Anal. Chem. 81 8783
[3] Pan C L, Liu H L, Guo Y, Jing S, Sun J, Zhou H F, Wang H 2014 Acta Phys. Sin. 63 154211 (in Chinese) [潘成龙, 刘红利, 郭芸, 景姝, 孙静, 周禾丰, 王华 2014 63 154211]
[4] Wang T, Wang Y H, Fu M, Li B, Zhou J 2007 Rare Metal Mat. Eng. 36 149 (in Chinese) [王婷, 王悦辉, 富鸣, 李勃, 周济 2007 稀有金属材料与工程 36 149]
[5] Deng T L, Yan S R, Hu J G 2014 Acta Phys. Chim. Sin. 30 773 (in Chinese) [邓陶丽, 闫世润, 胡建国 2014 物理化学学报 30 773]
[6] Yang J H, Dai S X, Jiang Z H 2003 Prog. Phys. 23 284 (in Chinese) [杨建虎, 戴世勋, 姜中宏 2003 物理学进展 23 284]
[7] Amitava P, Christopher S F, Rakesh K, Paras N P 2003 Appl. Phys. Lett. 83 284
[8] Passuello T, Piccinelli F, Pedroni M, Bettinelli M, Mangiarini F, Naccache R, Vetrone F, Capobianco J A, Speghini A 2011 Opt. Mater. 33 1500
[9] Yang Z, Guo C F, Chen Y Q, Li L, Li T, Jeong J H 2014 Chin. Phys. B 23 064212
[10] Yang Z P, Liu Y F, Wang L W, Yu Q M, Xiong Z J, Xu X L 2007 Acta Phys. Sin. 56 546 (in Chinese) [杨志平, 刘玉峰, 王利伟, 余泉茂, 熊志军, 徐小岭 2007 56 546]
[11] Etchart I, Huignard A, Bérard M, Nordin M N, Hernández I, Curry R J, Gillin W P, Cheetham A K 2010 J. Mater. Chem. 20 3989
[12] Zhao H L, Liu S X, Wang M W, Li W J 2007 J. Chin. Chem. Soc. 35 611 (in Chinese) [赵惠玲, 刘世香, 王明文, 李文军 2007 硅酸盐学报 35 611]
[13] Dai L, Xu C, Zhang Y, Li D Y, Xu Y H 2013 Chin. Phys. B 22 094201
[14] Chen X B, Li M X, Sawanobori N, Zeng Z, Nie Y X 2000 Acta Phys. Sin. 49 2482 (in Chinese) [陈晓波, 李美仙, Sawandobori N, 曾哲, 聂玉昕 2000 49 2482]
[15] Wang B Q, Ning Q J, Wang X F 2011 New Chem. Mat. 39 9 (in Chinese) [王邦卿, 宁青菊, 王秀峰 2011 化工新型材料 39 9]
[16] Ding W J, Zhang M, Wang J, Su Q 2011 Chin. J. Lumin. 32 256 (in Chinese) [丁唯嘉, 张梅, 王静, 苏锵 2011 发光学报 32 256]
[17] Wang Z J, Wu J N, Li P L, Yang Z P, Guo Q L, Yang Y M 2010 J. Chin. Chem. Soc. 38 431 (in Chinese) [王志军, 吴君楠, 李盼来, 杨志平, 郭庆林, 杨艳民 2010 硅酸盐学报 38 431]
[18] Xia Z G, Li Q, Sun J Y 2007 Mater. Lett. 61 1885
[19] Lai S F, Yang Z W, Wang R F, Wu H J, Liao J Y, Qiu J B, Song Z G, Yang Y, Zhou D C 2013 J. Mater. Sci. 48 8566
[20] Pandozzi F, Vetrone F, Boyer J C, Naccache R, Capobianco J A, Speghini A, Bettinelli M 2005 J. Phys. Chem. B 109 17400
[21] Qi Z J, Huang W G 2013 Acta Phys. Sin. 62 197801 (in Chinese) [齐智坚, 黄维刚 2013 62 197801]
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