摘要
Eu-doped transparent oxyfluoride borosilicate glass ceramics containing Ba2GdF7 nanocrystals were prepared by controlling crys-tallization of melt-quenched glass fabricated under a reductive atmosphere.In the oxyfluoride borosilicate glass ceramics,the mean crystal size of Ba2GdF7 nanocrystals was about 30 nm,which could be observed by X-ray diffraction（XRD） and transmission electron microscopy analysis.The photoluminescence spectra of the samples excited at 392 nm showed that,besides the characteristic sharp emissions of Eu3＋ ions,a very intense broadband emission of Eu2＋ ions centered at 450 nm appeared.The photoluminescence intensity of Eu3＋ and Eu2＋ ions in the glass ceramics was much stronger than that in the as-made precursor.The long decay lifetimes of Eu3＋ and Eu2＋ ions evidenced the partitions of Eu3＋ and Eu2＋ ions into the Ba2GdF7 nanocrystals.The energy transfer from Gd3＋ ions to Eu3＋ and Eu2＋ ions was confirmed by the excita-tion and emission spectra.
Eu-doped transparent oxyfluoride borosilicate glass ceramics containing Ba2GdF7 nanocrystals were prepared by controlling crys-tallization of melt-quenched glass fabricated under a reductive atmosphere.In the oxyfluoride borosilicate glass ceramics,the mean crystal size of Ba2GdF7 nanocrystals was about 30 nm,which could be observed by X-ray diffraction（XRD） and transmission electron microscopy analysis.The photoluminescence spectra of the samples excited at 392 nm showed that,besides the characteristic sharp emissions of Eu3＋ ions,a very intense broadband emission of Eu2＋ ions centered at 450 nm appeared.The photoluminescence intensity of Eu3＋ and Eu2＋ ions in the glass ceramics was much stronger than that in the as-made precursor.The long decay lifetimes of Eu3＋ and Eu2＋ ions evidenced the partitions of Eu3＋ and Eu2＋ ions into the Ba2GdF7 nanocrystals.The energy transfer from Gd3＋ ions to Eu3＋ and Eu2＋ ions was confirmed by the excita-tion and emission spectra.
作者
辛凤霞
赵士龙
徐时清
夹国华
邓德刚
王焕平
黄立辉
XIN Fengxia;ZHAO Shilong;XU Shiqing;JIA Guohua;DENG Degang;WANG Huanping;HUANG Lihui(College of Materials Science and Engineering,China Jiliang University,Hangzhou 310018,China)
基金
Project supported by the National Science Foundation of China (51072190 and 11004177)
Program for New Century Excellent Talents in University (NCET-07-0786)
Zhejiang Provincial Natural Science Foundation of China (Z4100030 and Y4110621)
