Perylene Tetracarboxylic Acid Crosslinked to Silica Matrix that Enables Ultrahigh Solid‐State Quantum Yield and Efficient Photon Recycling for Holographic Luminescent Solar Concentrators

Abstract

Perylene derivatives are a class of organic aromatic molecules, which possess large molar absorptivity, high quantum yields (QYs) in the monomer state, and tunable optical properties and thus have attracted much attention for diverse applications, such as photodetectors, solar cells, bioimaging, and luminescent solar concentrators (LSCs). [1][2][3][4][5][6][7][8] The photophysical properties can be regulated in several ways, such as by introducing the substituents at different sites for desired applications. [9,10] In addition, they can be also controlled via intermolecular interactions, for example, by the formation of dimers or aggregates through noncovalent interactions, such as πÀπ stacking and hydrogen bonding. [11][12][13] The monomer species of perylene dyes dispersed in organic solvent typically exhibited near-unity QYs. Unfortunately, when transferred to solid state (required for most optoelectronic applications), their QYs would be significantly reduced by severe aggregation-caused quenching (ACQ) via strong πÀπ stacking, for example, down to 7À12% for neat films. [14] Two different ways can be used to mitigate the ACQ effect, including functionalization with bulky substituents and introduction of a compatible solid matrix. [15][16][17][18][19][20][21][22][23][24] For example, Zhang et al, addressed the ACQ issue by functionalizing the perylene diimides with bay-position substitution. [25] Such substitution can slightly mitigate intermolecular πÀπ stacking by steric hindrance, still suffering from

Exploring the Influence of P3HT on PTCA Crystallization and Phase Behavior in Thin Films

“…Furthermore, the PTCA-SMs spectrum had three main bands with maxima recorded at around 2.71, 3.45, and 4.32 eV. The first two absorption bands that were assigned to π-π* transitions and the third band originated due to the charge transfer from the spz mixing orbital to the electron system of the macrocyclic ring of the PTCA-SMs [41]. In the first and second bands, the visible vibronic structure originated from electron-phonon interactions resulting from the vibrations of stretching aromatic rings.…”

“…Two additional temperatures, very clearly observed by the DSC and ellipsometry methods, were marked with green squares. The temperature of 43 • C, corresponding to T CC P3HT [41], detected by DSC, was also detected using ellipsometry, in the case of a temperature scan of the mixture. The presence of two T CC temperatures at 43 and 94 • C meant that, in the P3HT:PTCA-SMs layer, apart from the crystalline phase of the mixture, there was also a crystalline phase coming from P3HT.…”