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

Abstract

Designing deep-blue emitting materials with integrated high quantum yield and easy film-forming ability is challenging. As a typical organosilicon polymer, polycarbosilane (PCS) with −Si−C− repeated backbone has received much attention...

Tunable Photoinduced Charge Transfer at the Interface between Benzoselenadiazole-Based MOF Linkers and Thermally Activated Delayed Fluorescence Chromophore

“…One interesting family of chromophores that involves the control of different excited states is thermally activated delayed fluorescence (TADF) molecules, which have attracted substantial attention as luminescent materials due to their unique ability to harvest often detrimental triplet states as emissive singlet states through the reverse intersystem crossing process. − This phenomenon prolongs the fluorescence lifetime of TADF materials from nanoseconds to microseconds, , making them excellent candidates for several applications as luminescence sensors, − organic light-emitting devices (OLEDs), ,,, and more recently, as X-ray imaging materials. − However, due to the intricate interplay between the triplet and singlet excited states in TADF, it is challenging to control the optical properties of TADF materials by direct structural modifications, but they can serve as excellent energy and/or electron acceptor units. ,,,,,,− Other promising luminescent materials are heterobenzodiazole rings, which have also demonstrated excellent luminescent and photochemical behaviors. − Unlike TADF materials, the structures of these organic linkers can be easily altered to achieve different reaction outcomes upon light excitation, and they can serve as energy/electron donors in a variety of chemical composites. ,, Moreover, this kind of organic linker is designed to be an easy building block of metal–organic frameworks (MOFs) − that can serve not only to improve the optical properties of MOFs but also to favor and increase the efficiency of energy transfer processes at the donor–acceptor interface due to the highly ordered structure of the frameworks. These properties have been exploited in sensing, ,− catalysis, − and light-harvesting applications, i...…”