HAPPY Dyes as Light Amplification Media in Thin Films
The Journal of Organic Chemistry 2021
Elmārs Zariņš, Jūlija Perveņecka, Elīna Misiņa-Jubele, Oleksandr Bezvikonnyi, Aivars Vembris, Kārlis Balodis, Dmytro Volyniuk, Juozas Grazulevicius, Valdis Kokars

A series of 1H-amorphous tri-phenyl pyridine (HAPPY) dyes have been synthesized from luminescent triphenyl-groupcontaining 2-methyl-6-styryl-substituted-4H-pyran-4-ylidene derivatives in reactions with benzylamine and investigated for suitability as solution-processable light-emitting medium components in thin films for amplified spontaneous emission (ASE). Conversion of a 4H-pyrane ring into a 1H-pyridine fragment enables aggregation-induced emission enhancement (AIEE) behavior in the target products and slightly increases thermal stability, glass transition temperatures, and ASE efficiency with PLQY up to 15% and ASE thresholds as low as 46 μJ/ cm2 in neat spin-cast films, although thermal and photophysical properties are mostly dominated by the incorporated electron acceptors. Continued lasing parameter efficiency parameter improvement experiments revealed that no further optimization of HAPPY dyes by doping in polymer matrixes is required as the amplified spontaneous emission thresholds were lowest in pure neat films due to the AIEE phenomenon.

Light amplifier, amplified spontaneous emission, laser dyes, 4H-pyran-4-ylidene, 1H-pyridine, amorphous materials, molecular glasses, AIEE, DCM, Zeonex

Zariņš, E., Perveņecka, J., Misiņa, E., Bezvikonnyi, O., Vembris, A., Balodis, K., Volyniuk, D., Grazulevicius, J., Kokars, V. HAPPY Dyes as Light Amplification Media in Thin Films. The Journal of Organic Chemistry, 2021, Vol. 86, No. 4, pp.3213-3222. ISSN 0022-3263. e-ISSN 1520-6904. Available from: doi:10.1021/acs.joc.0c02574

Publication language
English (en)
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