Several Derivatives of 6-(Tert-Butyl)-4H-Pyran-4-Ylidene Malononitrile with Different Amorphous Phase Promoting Substituents for Light-Amplification Systems

Key Engineering Materials 2019
Elmārs Zariņš, Deins Alksnis, Jūlija Perveņecka, Patricija Paulsone, Kristīne Lazdoviča, Aivars Vembris, Valdis Kokars

Series of glassy 6-(tert-butyl)-4H-pyran-4-ylidene malononitrile (DCM) derivatives with covalently attached amorphous state promoting bulky triphenyl moieties through several chemical design approaches have been synthesized and investigated for suitability in organic solid state laser applications. Results showed that the bonding type of such functional groups had a considerable influence on glass structure forming dye thermal properties and a little influence on their optical properties. Thermal stability up to 346 oC was achieved with glass transitions in the range from 39 to 138 oC. Incorporation of bulky triphenyl substituents via ester groups showed remarkable amplified spontaneous emission threshold energy value reduction by 1.7 times in comparison to other bonding approaches with excitation threshold energy density up to 91 µJ/cm2. Synthesized dyes show potential as the light-amplification medium component in organic solid state lasers.

Keywords
laser dyes; 4H-pyran-4-ylidene; molecular glasses; amplified spontaneous emission
DOI
10.4028/www.scientific.net/KEM.800.275
Hyperlink
https://www.scientific.net/KEM.800.275

Zariņš, E., Alksnis, D., Perveņecka, J., Paulsone, P., Lazdoviča, K., Vembris, A., Kokars, V. Several Derivatives of 6-(Tert-Butyl)-4H-Pyran-4-Ylidene Malononitrile with Different Amorphous Phase Promoting Substituents for Light-Amplification Systems. In: Key Engineering Materials, Latvia, Rīga, 26-26 October, 2018. -: Trans Tech Publications, 2019, pp.275-279. ISSN 1662-9795. Available from: doi:10.4028/www.scientific.net/KEM.800.275

Publication language
English (en)