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+

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。

Abstract:

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.