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Natural Born Laser Dyes: Excited-State Intramolecular Proton Transfer (ESIPT) Emitters and Their Use in Random Lasing

Julien Massue¹, Thibault Pariat², Pauline M Vérité³

¹Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR CNRS 7515, Ecole Européenne de Chimie, Polymères et Matériaux (ECPM), 25 Rue Becquerel, CEDEX 02, 67087 Strasbourg, France. massue@unistra.fr.

Nanomaterials (Basel, Switzerland)

|August 2, 2019

Abstract:

A series of five excited-state intramolecular proton transfer (ESIPT) emitters based on a 2-(2'-hydroxyphenyl) benzoxazole (HBO) scaffold, functionalized with a mono-or bis-(trialkylsilyl) acetylene extended spacer are presented. Investigation of their photophysical properties in solution and in the solid-state in different matrix, along with ab initio calculations gave useful insights into their optical behavior. Random lasing studies were conducted on a series of PMMA doped thin films, showing the presence of stimulated emission above the threshold of pumping energy density (ρth ≈ 0.5-2.6 mJ cm^-2). In this work, the similarity of four level laser systems is discussed in light of the ESIPT photocycle.

Keywords:

ESIPT ab initio calculations excited states fluorescence random lasing

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