Realizing High Quantum Yield Blue Emission of Polycarbosilane Modified by Anthracene with Weak Intermolecular Interactions

Integration of high quantum yield blue emission and easy film-forming ability in organic emissive materials is challenging. Polycarbosilane (PCS) has received much attention as a model compound owing to its high stability, versatile optical properties, solvability and film-forming ability, also, anthracene as a star material is the first organic molecule for electroluminescence (EL) devices. Herein, an ingenious strategy was successfully introduced to prepare PCSx with 9-ethylanthracene (referred as 9-EA-PCSx) by hydrosilylation reaction using 9-vinylanthracene and PCS as starting materials, which transfer efficient energy from –Si–C– bonds to anthracene units. Grafted 9-ethylanthracene with extended π-conjugation effectively improve optical property, morphological stability, oxidation and ultraviolet (UV) radiation resistance of PCS. Particularly, 9-EA-PCSh powder displays excellent blue light-emitting (λmax=433 nm) with a high quantum yield (up to 80.06%), which is the highest value ever reported for or...