人們正在積極研究利用可再生資源整合功能性和可持續性的熒光薄膜。特別令人感興趣的是摻有熒光染料的纖維素薄膜，因為這些薄膜有望將染料的固有性質與優異的光學和機械性能完美結合。為此，需要全面了解纖維素薄膜的熒光特性，以推進纖維素熒光薄膜的發展。
我們獲得了異硫氰酸熒光素（FITC）、FITC標記的纖維素（FLC）和熒光素鈉鹽在甲醇、乙醇和水溶液中以及FLC薄膜中的吸收和熒光光譜。以硫酸奎寧在0.1 N H2SO4 溶液中的熒光為參考，將所得的各樣品的相對熒光量子產率換算成相應的絕對量子產率。熒光壽命是從熒光衰減曲線推導出來的。這些結果使我們能夠透過關聯熒光量子產率和壽命來確定每個樣品的輻射和非輻射衰變率。研究發現，FLC 在甲醇、乙醇和水溶液中的量子產率比 FITC 在溶液中的量子產率低約 10 倍。換句話說，與單獨使用 FITC 相比，將 FITC 引入纖維素鏈會導致熒光效率低。此外，FLC的吸收光譜和熒光光譜幾乎不會隨溶劑而變化，而當使用不同的溶劑時，單獨的FITC在這些光譜中變化很大。這意味著 FLC 的溶劑化顯色效果弱於單獨的 FITC。這些結果表明 FITC 部分和纖維素鏈之間存在相互作用，這可能會靜態地降低熒光量子產率，這可能是由於靜態猝滅所致。然而有趣的是，單獨的典型靜態猝滅通常不會改變輻射 k_r 和非輻射 k_nr 衰減常數，這與分析獲得的 k_r 和 k_nr 不一致。到目前為止的分析使我們能夠確定溶液中 FLC 的 k_r 值比溶液中 FITC 的 k_r 值降低了約 10 倍，而兩個系統之間的 k_nr 值幾乎保持不變。

Integrating functionality into sustainably sourced fluorescent films using renewable resources is being actively investigated. Of particular interest are cellulose films incorporated with fluorescent dyes, as these films could perfectly combine the inherent functionalities of dyes with the excellent optical and mechanical properties of these naturally sourced films. To this end, a comprehensive understanding of fluorescence properties in cellulose films is required to advance cellulosic fluorescence films.
We have acquired the absorption and fluorescence spectra of fluorescein isothiocyanate (FITC), FITC-labeled cellulose (FLC) and fluorescein sodium salt in methanol, ethanol, and aqueous solutions as well as FLC films. The obtained relative fluorescence quantum yield of each sample is converted into the corresponding absolute quantum yield using the fluorescence of quinine sulfate in 0.1 N H2SO4 solution as a reference. Fluorescence lifetimes are deduced from fluorescence decay profiles. These results allow us to determine the rate constants of radiative and nonradiative decay for each sample by correlating fluorescence quantum yields and lifetimes. The quantum yields of FLC in methanol, ethanol, and aqueous solutions are found to be about 10 times lower than those of FITC in solutions. In other words, chemically incorporating FITC into the cellulose backbone reduces the fluorescence efficiency. Further, the absorption and fluorescence spectra of FLC hardly vary depending on the solvents, whereas FITC alone greatly changes in those spectra when the different solvents are used. This means the solvatochromic effects of FLC are weaker than those of FITC alone. These results suggest that interactions exist between the FITC moieties and the cellulose chains, which can statically reduce the fluorescence quantum yield, possibly because of static quenching. Interestingly, however, typical static quenching alone usually does not change the radiative k_r and nonradiative k_nr decay constants, which is inconsistent with the analytically obtained k_r and k_nr. The analysis so far allows us to determine the k_r values of FLC in solutions are reduced by about 10-fold compared to those of FITC in solutions, while the k_nr values remain almost unchanged between the two systems.

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