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Li+掺杂对(ScLu)VO4:Eu3+红色荧光粉结构及发光性能的影响
作者: 迪1 2 叶信宇1 3 刘松彬3 杨新华1 2 谢世勇1 2  帆3 
单位:1. 国家离子型稀土资源高效开发利用工程技术研究中心 江西 赣州 341000  2. 赣州有色冶金研究所 江西 赣州 341000 3. 江西理工大学冶金与化学工程学院 江西 赣州 341000 
关键词:白光LED 发光 锂离子掺杂 高温固相法 晶体场对称性 
分类号:O482.31
出版年,卷(期):页码:2018,46(1):128-135
DOI:
摘要:

采用高温固相反应法制备了一系列Li+掺杂的(ScLu)VO4:Eu3+荧光粉。表征了样品的结构、形貌、红外光谱及荧光性能。结果表明:Li+掺杂没有改变样品原有的四方晶系体心结构,Li+以替代掺杂和间隙掺杂的方式进入主晶格,适当的Li+掺杂可以改善样品的团聚现象,减少高声子能量的杂质基团(OH?,CO32?)和荧光淬灭中心,从而增强样品发光。样品具有200~500 nm的宽带激发,在330 nm激发下,发射620 nm波长的窄带红光,归因于Eu3+的5D0→7F2跃迁。与Sc0.88Lu0.05VO4: Eu3+0.07样品相比,掺杂Li+样品的发光强度明显增强,随着Li+掺杂量的增加,5D¬0能级的荧光寿命呈现先增加后减小的趋势。当温度升高至 200 ℃时,Sc0.82Lu0.05VO4:Eu3+0.07,Li+0.06样品的发射强度仍保持在25 ℃时的73%。

 A series of Li+-doped (ScLu)VO4:Eu3+ phosphors were synthesized via solid-state reaction. The structure, morphology and luminescence properties of the samples were characterized. The results show that the Li+-doped samples maintain a body-centered tetragonal structure of (ScLu)VO4:Eu3+. The Li+ ions are introduced into the host lattice through substitutional doping or interstitial doping. The agglomeration minimizes, and the impurities (i.e., OH? and CO32?) with a higher phonon energy reduce after adding the appropriate amount of Li+ ions to the sample, thereby giving rise to a reduction in the quenching centers and an increase in the emission intensity. The excitation spectra of the samples show a broad band at 200?500 nm, and an intense red emission (centered at 620 nm) appears under the excitation of 330 nm, which can be attributed to 5D0→7F2 transitions. The emission intensity can be enhanced when Li+ ions are introduced to (ScLu)VO4:Eu3+. The decay curve of the 5D0 state of the as-prepared samples displays a single-order exponential behavior, i.e., the lifetime of 5D0 first increases and then decreases with the increase of Li+ doping concentration. The emission intensity of Sc0.82Lu0.05VO4:Eu3+0.07, Li+0.06 is 73% of the initial value at 25 °C when the temperature increases to 200 °C.

基金项目:
国家自然科学基金(51304086);江西省杰出青年人才资助计划人选(20171BCB23064);江西理工大学清江青年英才支持计划人选资助项目。
作者简介:
吴 迪(1991—),男,硕士,助理工程师。
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