摘要
以苯乙酮酸和邻菲咯啉为配体,不同摩尔比铕和惰性离子(La3+,Y3+,Gd3+)为中心离子,合成了系列配合物EuxRE1-xL3phen(RE=La,Y,Gd),测定了其荧光激发光谱和荧光发射光谱,研究了惰性离子(La3+,Y3+,Gd3+)对Eu3+荧光性能的影响。结果表明,配合物激发光谱相似,均在350~360 nm范围内出现最大激发,属于配体的吸收峰,在398 nm附近出现弱的激发为Eu3+的吸收峰;系列配合物荧光发射光谱相似,均显示Eu3+离子的特征发射光谱,位于583,595,617,654,703 nm附近出现5组强度不同的发射峰,分别归属为Eu3+的5D0—7F0,5D0—7F1,5D0—7F2,5D0—7F3,5D0—7F4能级跃迁。发射光谱表明,系列配合物中La3+离子对Eu3+的荧光发射峰峰位影响最大,EuxLa1-xL3phen中La3+的摩尔分数为0.7时,Eu3+的5D0—7F2跃迁可改变5.2 nm,而Y3+和Gd3+对Eu3+的荧光发射峰峰位影响较弱,配合物EuxY1-xL3phen和EuxGd1-xL3phen中Eu3+的荧光发射峰位变化较小,最大时仅改变2 nm;发射光谱强度表明,La3+对Eu3+的荧光发射影响最大,EuxLa1-xL3phen中La3+含量为0.7时,可使其相对荧光强度增大2倍以上,对其具有很好的敏化作用。这对人们寻找发光性能好、价格便宜的发光材料提供了理论依据。
Three series of dinuclear complexes（EuxLa1-xL3phen） of phenylglyoxylic acid and phenathroline with different molar ratios of Eu^3＋ to inert nuclei （RE=La^3＋ , Y^3＋ and Gd^3＋ ） were synthesized. Their excitation and emission spectra were studied. The excitation spectra showed that the optimum excitation wavelengths of the complexes are all in the range of 350-360 nm, which belong to the excitation peaks of ligands, and the weak excitation peak of Eu^3＋ is at about 398 nm; The emission spectra showed that there are five emission bands at about 583, 595, 617, 654 and 703 nm respectively for all the complexes, due to ^5D0-^7F0,^5D0-^7F1,^5D0-^7F2,^5D0-^7F3,^5D0-^7F4transitions of Eu^3＋ respectively. The authors also found that the emission peak positions of Eu^3＋ shift the most in the complexes EuxLa1-xL3phen, the position of ^5Do-^7 F2 transition shifts 5.2 nm when the molar ratio of Eu^3＋ ： La^3＋ is 0.3 ： 0.7, but the addition of Y^3＋ and Gd^3＋ makes the emission peak positions of Eu^3＋ change less than that of La^3＋. Meanwhile the luminescence intensity of Eu^3＋ can be most enhanced by La^3＋ in all the complexes. The conclusion we found in the present paper could help search the luminescence materials with low cost and good luminescence properties.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期525-529,共5页
Spectroscopy and Spectral Analysis
关键词
铕
惰性离子
苯乙酮酸
邻菲咯啉
荧光光谱
Europium~ Inert ion
Phenylglyoxylic acid
Phenathroline
Fluorescence spectra
