A new coumarin laser dye 3-(benzothiazol-2-yl)-7-hydroxycoumarin

The electronic absorption, and emission spectra as well as fluorescence quantum yield of 3-(benzothiazol-2-yl)-7-hydroxycoumarin (BTHC) were measured in different solvents and are affected by solvent polarity (Δ f). The deprotonation of BTHC by triethylamine is a reversible process. BTHC is relative...

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Bibliographic Details
Published in:Optics and laser technology 2005-04, Vol.37 (3), p.245-249
Main Authors: Azim, S.A., Al-Hazmy, S.M., Ebeid, E.M., El-Daly, S.A.
Format: Article
Language:English
Subjects:
3-(benzothiazol-2-yl)-7-hydroxycoumarin
Dye lasers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Laser dyes
Lasers
Lifetime
Medium effect
Optical materials
Optics
Physics
Polymers and organics
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Summary:The electronic absorption, and emission spectra as well as fluorescence quantum yield of 3-(benzothiazol-2-yl)-7-hydroxycoumarin (BTHC) were measured in different solvents and are affected by solvent polarity (Δ f). The deprotonation of BTHC by triethylamine is a reversible process. BTHC is relatively photostable, the quantum yield of photodecomposition ( φ c) was found to be 2×10 −4 and 2.7×10 −4 in EtOH and DMF, respectively. The fluorescence lifetimes of BTHC were measured in the absence and in the presence of molecular oxygen and were found to be 2.82 and 2.78 ns , respectively. BTHC acts as good laser dye upon pumping with nitrogen laser (λ ex =337.1 nm) in ethanol and gives laser emission with maxima at 508 and 522 nm .
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2004.04.003