Colour-tuneable solid-state fluorescence of crystalline powders formed from push-pull substituted 2,5-diphenyl-stilbenes.

Autor:	Pauk K; Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice Studentská 95 Pardubice CZ-530 09 Czech Republic ales.imramovsky@upce.cz., Luňák S Jr; Materials Research Centre, Faculty of Chemistry, Brno University of Technology Purkyňova 464/118 Brno CZ-612 00 Czech Republic vala@fch.vut.cz., Růžička A; Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice Studentská 573 Pardubice CZ-532 10 Czech Republic., Marková A; Materials Research Centre, Faculty of Chemistry, Brno University of Technology Purkyňova 464/118 Brno CZ-612 00 Czech Republic vala@fch.vut.cz., Teichmanová K; Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice Studentská 95 Pardubice CZ-530 09 Czech Republic ales.imramovsky@upce.cz., Mausová A; Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice Studentská 95 Pardubice CZ-530 09 Czech Republic ales.imramovsky@upce.cz., Kratochvíl M; Materials Research Centre, Faculty of Chemistry, Brno University of Technology Purkyňova 464/118 Brno CZ-612 00 Czech Republic vala@fch.vut.cz., Smolka R; Materials Research Centre, Faculty of Chemistry, Brno University of Technology Purkyňova 464/118 Brno CZ-612 00 Czech Republic vala@fch.vut.cz., Mikysek T; Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice Studentská 573 Pardubice CZ-532 10 Czech Republic., Weiter M; Materials Research Centre, Faculty of Chemistry, Brno University of Technology Purkyňova 464/118 Brno CZ-612 00 Czech Republic vala@fch.vut.cz., Imramovský A; Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice Studentská 95 Pardubice CZ-530 09 Czech Republic ales.imramovsky@upce.cz., Vala M; Materials Research Centre, Faculty of Chemistry, Brno University of Technology Purkyňova 464/118 Brno CZ-612 00 Czech Republic vala@fch.vut.cz.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2022 Dec 08; Vol. 12 (54), pp. 34797-34807. Date of Electronic Publication: 2022 Dec 08 (Print Publication: 2022).
DOI:	10.1039/d2ra05593g
Abstrakt:	The solid-state fluorescence (SSF) of eight DPA-DPS-EWG derivatives (DPA = diphenylamino, DPS = 2,5-diphenyl-stilbene building block, EWG = electron withdrawing group) was studied. Varying the strength of the EWG enabled the tuning of the LUMO energy within a range broader than 1 eV, while the simultaneous changes of HOMO energy were less than 0.1 eV, according to cyclic voltammetry. The fluorescence maxima in dichloromethane laid between 483 and 752 nm and exhibited monoexponential decay and a photoluminescence quantum yield (PLQY) always higher than 35%. Six derivatives with a SSF PLQY higher than 10% in polycrystalline powder form continuously covered the range from 475 to 733 nm. Three components of SSF multiexponential decay, obtained by time-resolved fluorescence spectroscopy, were ascribed to exciton migration to nonfluorescent traps, and monomer-like and aggregate fluorescence. The character of the emitting aggregates was evaluated by quantum chemical modelling based on time-dependent density functional theory computations, carried out on the dimer arrangements obtained by X-ray diffractometry of the single crystals. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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