Search

Two-in-one fluorescent compounds: Blending the strong emitter, diquinaldinato aluminum, and the good electron transporter, tetraphenyl silole, resulted in highly fluorescent compounds that are promising candidates for light-emitting devices without the need of dopants (see figure). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Two novel highly fluorescent blue light emitting compounds were synthesized: 9,9-bis-(diquinaldinatoalumino)-1,3-diphenyl-9-silafluorene (4) and 9,9-bis(diquinaldinatoalumino)-9-silafluorene (7). Combining silafluorene and quinaldinate aluminum moieties resulted in molecules with high quantum yield efficiency both in solution (3134%) and in the solid state (7992%). 4 showed intense electroluminescence, 4090 cd/m2 at 15 V, and the mechanochromism of 7 was revealed.

Several 1,3-diphenyl-substituted silafluorene compounds were synthesized and characterized as potential fluorescent materials for OLED fabrication and bioimaging. Introducing phenyl groups into the silafluorene ring at the land 3-positions led to a red shift in the emission, resulting in blue light emitting compounds (lambda(max) 368-375 nm in solution; lambda(max) 362-371 and 482 nm in the solid state), and improved the quantum yield efficiency both in solution and as solids. Aggregation enhanced emission of the silafluorenes (AEE) was also investigated. Theoretical MO calculations were carried out to aid in understanding the optical properties of these molecules. Since these compounds might be useful in bioimaging, their toxicity was also investigated in skin fibroblast cells. All compounds were found to be nontoxic to the investigated cell cultures.