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

Abstract

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 PCS x with 9-ethylanthracene (referred as 9-EA-PCS x ) by a 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 improves optical property, morphological stability, and oxidation and ultraviolet (UV) radiation resistance of PCS. Particularly, 9-EA-PCSh powder displays excellent blue light emission (λmax = 433 nm) with a high quantum yield (up to 80.06%), which is the highest value ever reported for organosilicon polymers to the best of our knowledge. For the first time, such a synergistic effect of PCS with anthracene in this way paves a practical way toward reliable emissive materials capable of forming facile coatings and providing useful low-cost emitting layers in developing foldable organic devices.

Insight into the Relationship of Aqueous Solubility and Single-Crystal Structure of Harmine’s New Organic Salt Forms

“…Besides, hydrogen bonds, π···π interaction, and dispersion effects − are also very important during the dissolution process. Lattice energy and cohesive energy, which consider as many lattice forces as possible to a certain extent, would be a precise method to reflect the strength of the entire inner interaction of the crystal.…”

“…As an ionizable API, HAM can form a variety of acid salts, providing a variety of solid-state options for clinical application. The crystal structures of HAM hemisulfate monohydrate and HAM hydrochloride hemihydrate have been previously reported. , Compared with inorganic acids, organic acidic counterions provide a wider range of candidates for salt formation. The purpose of this article is to figure out the novel salt form of HAM with promoted aqueous solubility and how the solubility-related parameters affect the solubility of HAM organic acid salts.…”

Modulating the luminescent performances on blue-emitting coordination polymersviatuning the end-solvent molecules

“…Taking anthracene-based materials as an example, it is well known that anthracene derivatives can emit deep blue light with a high fluorescence quantum efficiency, good film formation and high stability, and have attracted widespread attention in recent years. 45 However, their blue device performance is still far from that of red and green devices, because of the aggregation-caused quenching (ACQ) effect that anthracene materials usually present in the solid state. Therefore, for this kind of luminescent material, such as anthracene-based luminescent CPs, reducing the ACQ effect of anthracene to improve its performance is crucially important.…”

Realizing highly efficient blue photoluminescence of dimethylsilane-aryl (phenylene, diphenylene, fluorenyl) main-chain polymers with σ–π conjugation

“…37 Subsequently, an ingenious strategy was introduced to successfully prepare 9-EA-PCS h by a hydrosilylation reaction using aryl (9-vinylanthracene) and PCS as starting materials, realizing exceptional blue light-emission ( λ max = 433 nm) with a high quantum yield (up to 80.06%). 38 PCS with strong –Si–C– bonds can further separate the conjugated part and envelop anthracene for reducing intermolecular core–core interactions and attack by oxygen or dimerization of the core. 38 However, only a limited amount of anthracene can be grafted onto PCS owing to its steric effects, which restricts their further improvement of quantum yield and leads to inferior charge carrier transporting properties.…”

“…38 PCS with strong –Si–C– bonds can further separate the conjugated part and envelop anthracene for reducing intermolecular core–core interactions and attack by oxygen or dimerization of the core. 38 However, only a limited amount of anthracene can be grafted onto PCS owing to its steric effects, which restricts their further improvement of quantum yield and leads to inferior charge carrier transporting properties.…”