【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。更多还原

【Abstract】 Three series of dinuclear complexes(EuxRE1-xL3phen) of phenylglyoxylic acid and phenathroline with different molar ratios of Eu3+ to inert nuclei(RE=La3+,Y3+ and Gd3+) 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 Eu3+ 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 and 5D0—7F4 transitions of Eu3+ respectively.The authors also found that the emission peak positions of Eu3+ shift the most in the complexes EuxLa1-xL3phen,the position of 5D0—7F2 transition shifts 5.2 nm when the molar ratio of Eu3+∶La3+ is 0.3∶0.7,but the addition of Y3+ and Gd3+ makes the emission peak positions of Eu3+ change less than that of La3+.Meanwhile the luminescence intensity of Eu3+ can be most enhanced by La3+ 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.更多还原