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采用高温固相法制备R2MgSi2O7:Eu(R=Ca,Sr,Ba)荧光粉,并对其发光性能及封装应用进行研究。详细讨论碱土元素的种类及锶/钙的比例对激发与发射光谱的影响,同时考察激活剂Eu2+浓度对发光强度的影响,也考察了将Ba2MgSi2O7:Eu0.005荧光粉封装于紫光芯片中的发光特性。结果表明,荧光粉基质中碱土元素的种类及碱土元素锶钙的含量对其发射及激发光谱有较大影响,随着碱土离子Ca2+含量的增加,发射光谱逐渐红移,发光强度逐渐减弱。本文对这一变化机理进行了初步分析。当激活剂Eu2+摩尔浓度为0.005时,荧光粉具有较好的发光强度,并且当荧光粉的质量浓度达到19%时,LED具有较好的光效。
The R2MgSi2O7: Eu (R = Ca, Sr, Ba) phosphor was prepared by solid state reaction at high temperature, and its luminescent properties and encapsulation applications were studied. The influence of the kind of alkaline earth elements and strontium / calcium ratio on the excitation and emission spectra was discussed in detail. At the same time, the effect of the activator Eu2 + concentration on the luminescence intensity was also investigated. The luminescence of Ba2MgSi2O7: Eu0.005 phosphor encapsulated in the violet chip characteristic. The results show that the types of alkaline earth elements and the amount of strontium calcium in alkaline earth elements have a great influence on the emission and excitation spectra. With the increase of Ca2 + content in alkaline earth, the emission spectra gradually redshift and the luminescence intensity decreases gradually. This article has carried on the preliminary analysis to this change mechanism. When the activator Eu2 + molar concentration of 0.005, the phosphor has better luminous intensity, and when the mass concentration of phosphor reaches 19%, the LED has better luminous efficiency.