Eu3+浓度对Ca3Al2O6:Eu3+晶体结构和发光性能的影响

以β-丙氨酸和尿素为燃料,采用溶液燃烧法在低温450℃下合成制备了Ca3Al2O6:Eu3+荧光粉。样品的发射光谱由位于594 nm、617 nm、653 nm及700 nm处的4组线状峰构成,分别对应Eu3+的5D0→7Fj(j=1~4)特征跃迁,其中617 nm处的峰最强,样品呈现红色发光。考察了Eu3+掺杂浓度对晶体结构和发光性能的影响。结果呈示:随着掺杂浓度的增加晶格常数逐渐减小,O—Al—O]的对称伸缩振动Raman峰蓝移;在低掺杂浓度时荧光强度逐渐增大,掺杂6%时达到最大,之后出现浓度猝灭现象,猝灭机制为交互作用;Eu3+的5D0→7F2与5D0→7F1跃迁强度比随着掺杂浓度的增加逐渐增大,掺杂的Eu3+主要取代处于非对称中心的Ca2+。

Effect of Eu3+ Concentration on Crystal Structure and Luminescence Properties of Ca3Al2O6:Eu3+

Ca3Al2O6:Eu3+ phosphor was prepared via solution combustion synthesis at 450 ℃ using a fuel mixture of urea and β-alanine.It shows four major emission peaks located at 594 nm,617 nm,653 nm and 700 nm corresponding to 5D0→7Fj(j=1～4) typical transitions of Eu3+ respectively.The strongest one appears at 617 nm which emits red light.Effect of Eu3+ doped concentration on crystal structure and luminescence properties of Ca3Al2O6:Eu3+ was studied.The results show that with the increasing of Eu3+ doped concentration the lattice parameters decrease together with a blue shift of the Raman peak of the symmetric stretching vibration of O—Al—O].The emission intensity increases gradually with the addition of Eu3+ up to the quenching concentration 6%,the quenching mechanism is considered to be the exchange interaction.The intensity ratio of 5D0→7F2 to 5D0→7F1 increases following the enhanced Eu3+ doped concentration,which indicates that the Eu3+ ions occupy more inversion symmetry sites of Ca2+ in Ca3Al2O6:Eu3+.