Impacts of Si extension on the singlet states of phenylethynyl anthracene

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-12-24 DOI:10.1016/j.jlumin.2024.121041

Erkan Aksoy

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Abstract

This study reports the synthesis, photophysical, and electrochemical characterization of a new silyl-extended fluorescent emitter in comparison to commercial BPEA with similar pi-conjugation structure. The structure of 9,10-Bis(TPhSi)A-Ant was anticipated to reduce aggregation tendency while also extending pi-conjugation. The singlet state behaviors of 9,10-Bis(TPhSi)A-Ant and BPEA in solution and film were investigated by photluminescence (PL), emission lifetime (ns TCSPC), fluorescence quantum yield (PLQY), and time resolved-PL spectroscopy. Compared to BPEA the addition of triphenylsilane was found to shift the fluorescence peak from 475 to 484 nm, and reduce the Stokes shift from 552.7 cm⁻¹ to 303.2 cm⁻¹. While both molecules exhibited almost 100 % PLQY in solution, both were found to suffer similar levels of concentration-induced emission quenching in films. 9,10-Bis(TPhSi)A-Ant despite its steric Si groups had lower film PLQY – likely due to increased reabsorption – while time-resolved PL spectroscopy confirmed a lower aggregation tendency. These results demonstrate both the steric and electronic effects of silyl extension, with relevance for the development of new photonic materials.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.