IR-792 as near IR (NIR) laser dye was dissolved with different concentrations in two types of ionic liquids (ILs) of different anion and cation, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM TFSI) & 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIM BF₄), as the benign green solvent and in methanol (MeOH) as a standard solvent. The behavior of fluorescence of IR-792 dye was studied. The fluorescence of IR-792 dissolved in the ILs was heavily compared to organic solvent. Some photo-physical parameters of IR-792 were calculated. Mainly, IR-792 had a very low quantum yield of fluorescence with high intersystem crossing rate & fluorescence lifetime in picosecond range. Optical absorption and behavior of fluorescence for the rigorously the purified imidazolium ILs in the neat condition and effect of IR-792 on their fluorescence have been examined. The emission behavior of IR-792 in green solvents was independent upon the wavelength of excitation, while the emission behavior of green solvents dependent upon the wavelength of excitation whether in pure state or with NIR laser dye. At most, the intensity of fluorescence of ILs is dependent upon dye concentration.

中文翻译：

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新型良性绿色溶剂中近红外激光染料的光谱和光物理性质。

IR-792 作为近红外 (NIR) 激光染料以不同浓度溶解在两种不同阴离子和阳离子的离子液体 (IL) 中，1-乙基-3-甲基咪唑双（三氟甲基磺酰基）亚胺（EMIM TFSI）和 1- 3-甲基咪唑四氟硼酸丁酯 (BMIM BF ₄), 作为良性绿色溶剂，以甲醇 (MeOH) 作为标准溶剂。研究了IR-792染料的荧光行为。溶解在 IL 中的 IR-792 的荧光与有机溶剂相比有很大差异。计算了 IR-792 的一些光物理参数。主要是，IR-792 具有非常低的荧光量子产率，具有高系统交叉率和皮秒范围内的荧光寿命。已经检查了在纯净条件下严格纯化的咪唑鎓离子液体的光吸收和荧光行为，以及 IR-792 对其荧光的影响。IR-792 在绿色溶剂中的发射行为与激发波长无关，而绿色溶剂的发射行为取决于激发波长，无论是纯态还是 NIR 激光染料。最多，