Synthesis and Spectroscopic Characterization of Thienopyrazine-Based Fluorophores for Application in Luminescent Solar Concentrators (LSCs)

• Main Authors: Xheila Yzeiri, Massimo Calamante, Alessio Dessì, Daniele Franchi, Andrea Pucci, Francesco Ventura, Gianna Reginato, Lorenzo Zani, Alessandro Mordini
• Format: Article
• Language: English
• Published: MDPI AG 2021-09-01
• Series: Molecules
• Subjects: organic fluorophores; NIR emission; thienopyrazine; luminescent solar concentrators
• Online Access: https://www.mdpi.com/1420-3049/26/18/5428

Organic fluorophores have found broad application as emitters in luminescent solar concentrators (LSCs) for silicon photovoltaics. In particular, the preparation of organic conjugated systems with intense light-harvesting ability, emissions in the deep-red and NIR regions, and large Stokes shift values represent a very challenging undertaking. Here, we report a simple and easy way to prepare three symmetrical donor–acceptor–donor (DAD) organic-emitting materials based on a thienopyrazine core. The central core in the three dyes was modified with the introduction of aromatic substituents, aiming to affect their optical properties. The fluorophores were characterized by spectroscopic studies. In all cases, visible-NIR emissions with large Stokes shifts were found, highlighting these molecules as promising materials for the application in LSCs.