Modulation of intramolecular charge transfer in D-A functionalized pyrrolopyrazine and their application in luminescent solar concentrators

• Published in: Dyes and pigments 2024-01, Vol.221, p.111775, Article 111775
• Main Authors: Hwang, Do-Yeon, Meti, Puttavva, Mateen, Fahad, Lee, Da-Sol, Yang, Ye-Jin, Eom, Jun-Sik, Shin, Ji-Won, Qaid, Saif M.H., Gong, Young-Dae, Hong, Sung-Kyu
• Format: Article
• Language: English
• Subjects: Aggregation-induced emission; Intramolecular charge transfer; Luminescent solar concentrator
• ISSN: 0143-7208
• DOI: 10.1016/j.dyepig.2023.111775

In this study, we fabricated LSCs using pyrrolopyrazine-based organic fluorophore (PP2) with an intramolecular charge transfer (ICT) function and aggregation-induced emission. PP2 incorporates unique features, including an intramolecular charge transfer (ICT) function and aggregation-induced emission. The pyrrolopyrazine core of PP2 is decorated with an electron-rich dimethylamine group and two electron-poor cyano groups, enhancing its potential for light harvesting in LSC applications. In the polymethylmethacrylate (PMMA) matrix, PP2 showed strong absorption near ultraviolet (395 nm–406 nm), emitted green-colored visible light (474 nm–478 nm), and exhibited a photoluminescence quantum efficiency (PLQY) of 67%. The external photon efficiency (ηext) and internal photon efficiency (ηint) of the fabricated LSC under AM 1.5G illumination (1 sun) were 3.36% and 39.1%, respectively. Subsequently, we conducted an analytical simulation to estimate the ηext and the ηint as the dimensions of the LSC were scaled up. In addition, the photovoltaic performance measurement under 1 sun showed a power conversion efficiency (ηPCE) of 1.074% with a scattering background and 0.633% without a scattering background. Thus, this research introduces PP2 as a novel fluorophore with promising prospects for advancing the field of LSC technology. •Pyrrolopyrazine-based AIEgen decorated with donor-acceptor group is prepared via Suzuki-Miyaura cross-coupling reaction.•PP2 LSCs showed ηint and ηint of 39.1% and 3.36% under AM 1.5G illumination (1sun).•PP2 LSC showed ηPCE of 1.074% with a scattering background and 0.633% without a scattering background.