Beam Technology and Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India.
Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Dec 5;282:121642. doi: 10.1016/j.saa.2022.121642. Epub 2022 Jul 18.
Water is being considered as an economical, safe and environmental friendly alternative solvent for dye lasers. However, the use of water in dye laser is restricted due to the formation of non-emissive aggregates of dye molecules. In the present study we have explored the possibility of the use of commercially available surfactant molecules for the water based laser of Pyrromethene 597 (PM597) dye, which has emerged as an alternative for more commonly used Rhodamine dyes in dye laser systems. Our studies show that in water, PM597 forms non-emissive aggregates which can be dissociated into monomeric dye molecules by adding common surfactants. Further, the high microviscosity in the micellar media retarded energy wasting ring puckering process in the excited state of the dye leading to the increase in its emission yield and excited state lifetime to a significant extent. It has been demonstrated that the emission yield and excited state lifetime in surfactant solution is relatively higher than in ethanol, the most commonly used organic solvent for dye lasers. Lasing action has been demonstrated in the aqueous solution of dye and lasing efficiency is found to be comparable to ethanol.
水被认为是一种经济、安全和环保的替代溶剂，可用于染料激光器。然而，由于染料分子形成非辐射聚集体，水在染料激光器中的应用受到限制。在本研究中，我们探索了在商品化表面活性剂存在下，用水作为 Pyrromethene 597（PM597）染料的激光基质的可能性，PM597 已经成为染料激光器系统中更常用的 Rhodamine 染料的替代品。我们的研究表明，在水中，PM597 形成非辐射聚集体，通过添加常见的表面活性剂可以将其解离成单体染料分子。此外，胶束介质中的高微粘度会阻碍染料激发态中能量浪费的环扭转过程，从而显著提高其发射产率和激发态寿命。已经证明，在表面活性剂溶液中的发射产率和激发态寿命相对高于乙醇，乙醇是最常用的染料激光器有机溶剂。已经在染料的水溶液中演示了激光作用，并且发现激光效率与乙醇相当。
