Proton-transfer lasers from solid polymeric chains with covalently bound 2-(2′-hydroxyphenyl)benzimidazole groups
- 20 April 1994
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 33 (12) , 2266-2272
- https://doi.org/10.1364/ao.33.002266
Abstract
The lasing properties of a number of newly synthesized 2-(2′-hydroxyphenyl)benzimidazole derivatives copolymerized with methyl methacrylate or dissolved in poly(methyl methacrylate) and pumped with an N2 laser are reported. The radiation mechanism is based on the intramolecular proton-transfer in the electronic excited state. Both the lasing efficiency and the dye photostability increase significantly when the proton-transfer chromophore is covalently bound to the polymeric chain, and energy-conversion efficiencies comparable to those obtained in liquid solution are demonstrated.Keywords
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