7-羟基-4-三氟甲基香豆素在介孔AlPO_4玻璃中发光性质

Fluorescent Properties of 7-Hydroxy-4-Trifluoromethylcoumarin Incorporated in Mesoporous AlPO_4 Glass

运用新型溶胶凝胶法首先制备介孔AlPO4玻璃,然后通过浸渍法将7-羟基-4三氟甲基香豆素染料（7-香豆素）镶嵌入该玻璃中.通过激发光谱和荧光光谱研究了7-香豆素染料镶嵌浓度以及AlPO4玻璃介孔孔径对光学性质和染料分子的形态的影响。激发光谱表明,7-香豆素单体分子在介孔AlPO4玻璃中的激发带主要在372 nm处。随着染料浓度从1×10-6mol/L增加到1×10-2mol/L,激发峰逐渐蓝移至362 nm处,说明染料分子在介孔玻璃中逐渐聚集成H-二聚体。荧光光谱结果表明,随着染料浓度从1×10-6mol/L增加到1×10-2mol/L,其主要荧光峰从421 nm红移到435nm。通过镶嵌浓度1.0×10-4mol/L时两种介孔AlPO4玻璃的发射光谱和激发光谱可以表明,孔径为3.52nm的介孔玻璃的主要发射峰为428 nm,激发峰为370nm,而孔径为6.74nm的介孔玻璃发射峰相对红移至433nm,激发峰蓝移至365nm,说明较小孔径的介孔AlPO4玻璃抑制染料的聚集效应更好,有利于高浓度染料的镶嵌。

7-hydroxy-4-trifluoromethylcoumarin（7-coumarin） incorporated in mesoporous AlPO4 glass is prepared with dipping method.The effects of 7-Coumarin concentration and pore size of AlPO4 glass on the optical properties and molecular formation of 7-Coumarin are studied by excitation spectra and emission spectra.The main excitation band placed at 372 nm is ascribed to monomeric 7-Coumarin in excitation spectra,and the blue shift of main excitation band is due to the aggregating of fluorescent dimers in the mesoporous glass as 7-Coumarin concentration increases from 1×10-6 mol/L to 1×10-2 mol/L.Red shift of emission band from 421 nm to 435 nm is observed in emission spectra as 7-Coumarin concentration increases from 1×10-6 mol/L to 1×10-2 mol/L.The emission spectra and excitation spectra of two different mesoporous AlPO4 glass with the loading dyes concentration 1.0×10-4 mol/L are studied to investigate the effects of pore size on the optical properties.The blue shift of excitation band from 370 nm to 365 nm,as well as red shift of emission band from 428 nm to 433 nm are observed as the pore diameter of the AlPO4 glass increased from 3.52 nm to 6.74 nm,which reveals less aggregates as H-dimers in the AlPO4 mesoporous glass with smaller pore diameter and that can benefit for loading the dyes in high concentration.