金属增强荧光和类胡萝卜素在聚合物薄膜中的激发态动力学。

Department of Physics and Photon Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Republic of Korea.

Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Republic of Korea.

Sci Rep. 2019 Mar 5;9(1):3551. doi: 10.1038/s41598-019-40446-4.

Metal-enhanced fluorescence of carotenoids, all-trans-β-carotene and 8'-apo-β-carotene-8'-al dispersed in thin layers of polystyrene and polyethylene glycol were investigated by time-resolved fluorescence spectroscopy. The weak emission signals of carotenoids in polymer films were increased by 4-40 times in the presence of a silver island film and the emission lifetimes of both carotenoids were measured as significantly shortened. The energy transfer from the intermediate states of carotenoids to the silver islands and the subsequent surface plasmon coupled emission were proposed for the mechanisms of metal-enhanced fluorescence. The fluorescence enhancements of carotenoids in the polymer films were also investigated statistically over a wide area of the silver island films.

采用时间分辨荧光光谱法研究了分散在聚苯乙烯和聚乙二醇薄层中的类胡萝卜素、全反式-β-胡萝卜素和 8'-apo-β-胡萝卜素-8'-醛的金属增强荧光。在银岛膜存在下，聚合物薄膜中类胡萝卜素的弱发射信号增强了 4-40 倍，并且两种类胡萝卜素的发射寿命都明显缩短。提出了从类胡萝卜素的中间态到银岛的能量转移以及随后的表面等离激元耦合发射的机制，以解释金属增强荧光的机理。还对聚合物薄膜中类胡萝卜素的荧光增强进行了统计研究，研究范围涵盖了银岛膜的大面积区域。