文章摘要
高效红色荧光粉Li1-xAlSiO4+x:xEu3+的制备与发光性能研究
Preparation and Luminescence Properties of Highly Efficient Red Phosphor Li1-xAlSiO4+x:xEu3+
投稿时间:2019-05-14  修订日期:2019-07-09
DOI:
中文关键词: 红色荧光粉  Eu3+ 掺杂  高温固相法  白光LED  浓度猝灭
英文关键词: Red phosphor  Eu3+ doping  High temperature solid state method  W-LEDs  Concentration quenching
基金项目:内蒙古自然科学基金(2018MS02002)
作者单位E-mail
温慧霞 内蒙古科技大学化学与化工学院 710403630@qq.com 
许成功 内蒙古科技大学化学与化工学院  
樊彬 内蒙古科技大学化学与化工学院  
李红喜 内蒙古科技大学化学与化工学院  
旦真什姐 内蒙古科技大学化学与化工学院  
赵文玉 内蒙古科技大学化学与化工学院 zhaowenyu2011@hotmail.com 
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中文摘要:
      以碳酸锂、氧化铝、二氧化硅、Eu2O3为原料,采用传统高温固相法在较低温度下制备Eu3+离子掺杂LiAlSiO4红色荧光粉,并通过XRD、SEM和光致发光光谱分别对其晶体结构,粉体形貌和发光性能进行表征。结果表明:Eu3+离子掺杂浓度低于15%时,样品为单一基质;样品可以被近紫外350~420nm波段高效激发,最强激发峰位置位于394nm,发射光谱呈现出Eu3+的特征峰,谱带峰值位置在593 nm、616 nm,分别对应于Eu3+的5D0→7F1、5D0→7F2特征跃迁。最强发射对应的掺杂摩尔百分含量为12%,浓度猝灭的发生主要是因为四极-四极(q-q)相互作用,CIE坐标为(0.6464,0.3526),可应用于近紫外芯片激发LED用红色荧光粉。
英文摘要:
      Lithium carbonate, aluminium oxide, silicon dioxide, europium(III) oxide were used as raw materials to prepare a series of Eu3+ ion-doped LiAlSiO4 red phosphor Li1-xAlSiO4+x:xEu3+(x=0.05~0.18) by a conven-tional high-temperature solid-phase method at 1150℃. The crystal structure, particle morphology and luminescence properties of Li1-xAlSiO4+x:xEu3+ were characterized by XRD, SEM and photoluminescence spectrum. The influence of amount of Eu3+doping on the luminescence intensity, color temperature and hue of the red phosphors was investigated. The results indicated that the sample was single host when the Eu3+ doping molar fraction was below 15.0%. The sample could be excited by the near-ultraviolet band of 350~420 nm, and the strongest excitation peak was located at 394 nm. The emission spectrum showed characteristic peaks of Eu3+, at 593 nm and 616 nm, corresponding to 5D0→7F1, 5D0→7F2 transitions, re-spectively. The optimal doping molar fraction of Eu3+ corresponding to the strongest emission of sample was 12.0%. The occurrence of concentration quenching was mainly due to the quadrupole -quadrupole (q-q) interaction. The CIE coordinate of this sample is (0.6464, 0.3526), thus, it can be a candidate of red phosphor for NUV excited LEDs.
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