Photoluminescence behavior of riboflavin and lumiflavin in liquid solutions and solid films

详细信息	查看全文 | 推荐本文 |

• 作者：A. Penzkofer ; ^{alfons.penzkofer@physik.uni-regensburg.de}
• 关键词：Riboflavin ; Lumiflavin ; Starch films ; Polystyrene films ; Fluorescence ; Phosphorescence ; Delayed fluorescence ; Luminescence quantum yields ; Luminescence lifetimes ; Quantum yield of intersystem-crossing
• 刊名：Chemical Physics
• 出版年：2012
• 期刊代码：18_03010104
• 类别：ch
• 出版时间：25 May, 2012
• 卷：400
• 期：Complete
• 页码：142-153
• 文件大小：646 K

摘要

The absorption and emission behavior of riboflavin and lumiflavin in water, tetrahydrofuran (THF), water-starch, THF-polystyrene, starch films, and polystyrene films was studied at room temperature. Absorption cross-section spectra, fluorescence quantum distributions, and fluorescence quantum yields were determined. For the starch films additionally phosphorescence and delayed fluorescence spectra as well as phosphorescence lifetimes and delayed fluorescence lifetimes were measured and their quantum yields of intersystem-crossing, intrinsic triplet-based phosphorescence quantum yields, T₁-S₀ radiative lifetimes, and S₀-T₁ absorption strengths were calculated. A method of absolute intrinsic luminescence quantum distribution and quantum yield determination for dye doped films on transparent plates with a fluorimeter is described.