Effect of Yb^(3+) concentration on Er^(3+) luminescence properties of sol-gelderived silica-alumina xerogels

查看全文 作　　者：K.Tran [1,2]Ngoc;H.Pham [2]Thanh;C.Nguyen [2]Duc;[1]C.Armellini;[1]A.Chiasera;[1]M.Ferrari;[1]Y.Jestin;[3]M.Montagna;[3]E.Moser;[4]S.Pelli;[4]G.C.Righini 机构地区：[1]CNR-IFN Istituto di Fotonica e Nanotecnologie,CSMFO group,via Sommarie 14,I-38050 Povo,Trento,Italy;[2]ITIMS-Hanoi University of Technology,No 1,Dai Co Viet,Hanoi,Vietnam;[3]Dipartimento di Fisica,Università di Trento,CSMFO group,via Sommarive 14,I-38050 Povo,Trento,Italy;[4]CNR-IFAC Nello Carrara Institute of Applied Physics,Lab.of Optoelectronic Technologies,Via Madonna del Piano 10,50019 Sesto Fiorentino,Firenze,Italy 出　　处：《Optoelectronics Letters》索引2006年第2卷第5期,共4页 基　　金：This research is performed in the context of the Italy-Vietnamre-search project 6 BS 2 MAE2006-2008 .MIUR-FIRB RBNE012N3X,PAT FAPVU2004-2006 ,MIUR-PRIN2004-2006 . 摘　　要：Er3+/Yb3+ co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er/Si ppm and 6 000 Al/Si ppm.The Yb/Si content was varied from 0 to 4 000 ppm.Densification of the samples was achieved by thermal treatment in air at 950 ℃ for 120 hours with a heating rate 0.1 ℃/min.Photoluminescence spectroscopy was used to obtain information about the effective excitation efficiency of Er3+ ions by co-doping with Yb 3+ ions.The infrared-to-visible up-conversion luminescence has been investigated upon continuous wave excitation at 980 nm.The samples exhibit red,green and blue up-conversion emission.It is found that the intensity of up-conversion luminescence increases with increasing Yb3+ doping concentration.An opposite behavior is observed for the 4I13/2 luminescence of the Er3+ ions. 关 键 词：铒离子 二氧化硅 干凝胶 光致发光