Glass-forming derivatives of 2-cyano-2-(4H-pyran-4-ylidene) acetate for light-amplification systems

A series of 2-cyano-2-(4H-pyran-4-ylidene) acetate derivatives with triphenyl and 9H-carbazole moieties wen synthesized and investigated, mostly for potential applications in organic solid state lasers. Synthesized corn pounds show remarkable amorphous film formation ability, tunable thermal properties (thermal stability vane: from 190 degrees C to 387 degrees C and glass transition temperature from 94 degrees C up to 141 degrees C) with light absorption fron 400 nm to 600 nm and photoluminescence from 600 nm up to 800 nm. Dyes with incorporated mono-styryl electron donating fragment (KTB, KTBC and KTB3K) showed higher photoluminescence quantum yield (PLQY: (from 16% up to 23%), significantly lower amplified spontaneous emission (ASE) excitation threshold valuer (24-52 pJ/cm(2)) in pure thin films comparing to bis-styryl-electron donating fragment containing molecules (Bis. K4C, Bis-K5C and Bis-K4CK) with PLQY of 5-7% and ASE excitation threshold between 165 and 223 mu J/cm(2) Some of the investigated KTB-type laser dyes could be perspective materials for organic lasers as well as for laser technology investigation and applications.