摘要
金属指示剂 1 ( 2 吡啶偶氮 ) 2 萘酚 (PAN)对Ln3 + (Ln3 + =Yb3 + ,Nd3 + 和Er3 + )的近红外发光有不同的敏化作用 ,不论在固体还是在溶液中 ,PAN分子都可显著地敏化Yb3 + 离子的发光 ,对Er3 + 离子的发光也有一定的敏化作用 ,但不能敏化Nd3 + 离子的发光。溶剂的种类对配合物溶液的近红外发光强度有非常明显的影响。根据配体三重态能级与Ln3 + 的发射能级匹配的原理和浓度猝灭效应 ,对不同条件下Ln
Near-infrared luminescence lanthanide complexes, which are found potential application in laser system and fibre communication, have recently draw more attention than ever. We suggest that near-infrared luminescent lanthanide complexes could also find application in rare earth ions fluorospectrometry and fluorescence immunoanalysis. The advantage layes in the low interference by coexist rare earth ions and can improve the reliability. In the present work, Ln-PAN (Ln=Yb 3+, Nd 3+ and Er 3+, and PAN=1-(2- pyridylazo)-2-naphthol) complexes were synthesized and characterized by elemental analysis. Their near-infrared luminescence properties both in solid form and in solution were studied with a self-made luminescence determination system. It was found that near-infrared luminescence of Yb 3+ and Er 3+ complexes could be strongly sensitized by coordination of PAN, while that of Nd 3+ complex could not be sensitized. An energy transfer mechanism was proposed to explain the near-infrared luminescence properties of Ln-PAN complexes. The difference between emission energy level of Yb 3+, Nd 3+ and Er 3+ gives the different match effects with the triplet energy level of PAN. The luminescence intensity change dramatically with solvent, and ethanol solution gives the most intense emission. The fluorescence in ethanol solution is stronger than that in solid form, which was attributed to the concentration quenching effect. Unlike luminescent complexes of the commonly used lanthanide complexes of Tb 3+, Eu 3+, Sm 3+ and Dy 3+, which could only be excited with UV light, Ln-PAN (Ln=Yb 3+, Nd 3+ and Er 3+) complexes could be excited with whole spectrum range of visible light, and this is a great advantage in choose light source for luminescence analysis. The near-infrared luminescence of a mixed Ln-PAN (Ln=Yb 3+, Nd 3+ and Er 3+) solution also be determined independently, it shows there is no interference among the fluorescence of the three lanthanide ions.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2002年第1期49-52,共4页
Chinese Journal of Luminescence
基金
国家自然科学基金资助项目 ( 2 970 5 0 0 4)
