摘要
采用静电纺丝技术制备了非晶态PVP/[Sr(NO3)2+Mg(NO3)2+TEOS+Eu(NO3)3+Dy(NO3)3]复合纳米纤维,在还原气氛下对其进行煅烧,得到了一维纳米结构的Sr2Mg Si2O7∶Eu2+,Dy3+发光纤维。对其热性能、物相结构、形貌结构及发光性能进行了表征。热分析表明,温度高于800℃时,复合纤维中的水分、有机物、硝酸盐分解挥发完全,样品不再失重;物相分析表明,经1100℃还原气氛焙烧后形成了发育良好的晶相Sr2Mg Si2O7∶Eu2+,Dy3+纳米纤维;形貌分析表明,Sr2Mg Si2O7∶Eu2+,Dy3+发光纳米纤维表面粗糙,平均直径约为350 nm,呈颗粒串珠结构;荧光光谱分析表明,在360 nm的近紫外光激发下,Sr2Mg Si2O7∶Eu2+,Dy3+纳米纤维发射出Eu2+特征的明亮的蓝光,发射峰位于468 nm;余辉衰减曲线表明,Sr2Mg Si2O7∶Eu2+,Dy3+纳米纤维在紫外光照射15 min后其初始余辉亮度达到0.32 cd/m2,肉眼可见。
PVP /[Sr（ NO3）2＋ Mg（ NO3）2＋ TEOS ＋ Eu（ NO3）3＋ Dy（ NO3）3] composite nanofibers were prepared via electrospinning technique. Sr2 Mg Si2O7Eu2 ＋,Dy3 ＋luminescent nanofibers were synthesized by calcination of the as- prepared composite nanofibres in the reductive atmosphere. The properties of thermal,phase structure,morphology and fluorescence of the samples were characterized. The thermal analysis reveals that water,organic compounds and nitrate salts in the composite nanofibers are decomposed and volatilized totally,and the weight of the sample keeps constant when the temperature exceeds 800 ℃. XRD patterns shows the pure crystal phase structure of Sr2 Mg Si2O7Eu2 ＋,Dy3 ＋nanofibres are formed by calcination of the composite nanofibres at 1100 ℃ in the reductive atmosphere. SEM pictures indicates that the surface of Sr2 Mg Si2O7Eu2 ＋,Dy3 ＋luminescent nanofibers are rough and their average diameter is about 350 nm with a string of pearls structure. Fluorescence spectral analysis indicates that under the excitation of a near UV light（ 360 nm）,Sr2 Mg Si2O7Eu2 ＋,Dy3 ＋luminescent nanofibers reveal bright blue- emitting at 468 nm which is characteristic emission of Eu2 ＋ion. The afterglow decay curve shows that its initial afterglow brightness reaches at 0. 32 cd / m2 which is visible to eyes after being motivated by UV irradiation for 15 minutes.
出处
《稀土》
EI
CAS
CSCD
北大核心
2015年第5期37-42,共6页
Chinese Rare Earths
基金
国家高技术发展研究计划(863)项目(2012AA030313)
中央高校基本科研业务专项(JUSRP21003)
关键词
硅酸镁锶
发光纳米纤维
稀土
PVP
Sr2MgSi2O7
luminescent nanofibers
rare earths
polyvinylpyrrolidone（PVP）
