Glass-Forming Non-Symmetric Bis-Styryl-DWK-Type Dyes for Infra-Red Radiation Amplification Systems

Optical Materials 2019
Elmārs Zariņš, Jūlija Perveņecka, Aivars Vembris, Valdis Kokars

A series of D-π-A type organic dyes with bulky triphenylmethyl moiety containing 2,6-bis-(4-substituted)styryl-4H-pyran-4-ylidene donor (D) fragments and different electron acceptors (A) were synthesized and investigated, mostly for potential applications in organic solid-state lasers as infra-red (IR) radiation amplification medium. Dye glass transition temperature is above 99 °C with thermal stability in the region from 173 °C to 326 °C which was slightly influenced by the electron acceptor fragment attached to the 4H-pyrane ring in 4-position. Introducing substituents in 4-position within one of the styryl-fragments with stronger electron withdrawing properties decreased ASE excitation threshold values (Eth) up to 180 μJ/cm2 in dye spin-cast neat films and shifted photoluminescence and amplified spontaneous emission (ASE) processes into the infra-red (IR) region. Although more studies are required, some of the investigated non-symmetric bis-styryl-DWK-dyes show potential as a solution-processable gain medium for IR radiation amplification.

Atslēgas vārdi
Laser dye; Amplified spontaneous emission; DWK; 4H-pyran-4-ylidene; Amorphous material
DOI
10.1016/j.optmat.2019.05.002
Hipersaite
https://www.sciencedirect.com/science/article/pii/S0925346719303003?via%3Dihub

Zariņš, E., Perveņecka, J., Vembris, A., Kokars, V. Glass-Forming Non-Symmetric Bis-Styryl-DWK-Type Dyes for Infra-Red Radiation Amplification Systems. Optical Materials, 2019, Vol.93, 85.-92.lpp. ISSN 0925-3467. Pieejams: doi:10.1016/j.optmat.2019.05.002

Publikācijas valoda
English (en)