SiO_2凝胶玻璃中有机发光物质的浓度猝灭机制

Mechanism of Concentration Quenching of Organic Luminescent Molecules Doped in Silica Gel Glass

有机分子之间及有机分子与基质之间的各种相互作用，如激发态反应、二聚作用、交叉弛豫作用等，是引起有机染料浓度猝灭的主要原因。利用溶胶－凝胶工艺将有机染料芘、罗丹明６Ｇ、罗丹明Ｂ、香豆素１２０光学均匀掺入ＳｉＯ２凝胶玻璃中，上述相互作用得到有效限制，有机染料的猝灭浓度明显提高。相对乙醇溶液，猝灭浓度可提高２～３个数量级。

The concentration quenching of organic dyes is mainly induced by the organic molecular interactions, such as formation of excimer and dimer, intercrossing relaxation, etc. In this work, pyrene, rhodamine 6G, rhodamine B and coumarin 120 were doped into homogeneous transparent silica gel glass via solgel technique, and the mechanism of concentration quenching of these organic dyes in the gel glass were studied. Doped into silica gel glass, the organic molecules were isolated and adsorbed in the tiny pores of the inorganic network steadily, which decreased the dye molecular interactions effectively, and thus increased the quenching concentrations of the organic dyes remarkably. The results showed that the quenching concentrations of the organic dyes increased by 2～3 orders of magnitude with respect to that in ethanol solutions.