A new family of hybridized local and charge-transfer (HLCT) emitters bearing a pyrene structural unit has been developed. Deep-blue OLEDs based on them achieved high brightness over 10 000 cd m-2, high maximum external quantum efficiency over 10.5%, and high maximum exciton utilization efficiency approaching 100%, with CIE coordinates of (0.152, 0.065).
The development of energetic materials with both high energy and high safety has always been the focus of the field of energetic materials. In this paper, a low-current-sensitivity flexible energetic film composed of carbon nanofibers (CNFs)-coated Al/CuO metastable intermolecular composites (MICs) was prepared by a blow-spinning combined with controlled heat treatment technique. Hotspots can hardly generate in this kind of energetic film due to the increased electrical and thermal conductivity, leading to low sensitivity of MICs. It evenly stays at a high voltage (60 V) for 24 h without raising the temperature significantly. The energetic films keep the high energy release of MICs due to the additional violent reactions between CuO and CNFs as well as the light weight of CNFs, showing the heat release of 2864 J/g. In addition, the obtained films exhibit good mechanical properties and can maintain the structural integrity after 1000 cycles of repeated bending to a 6 mm curvature radius. The above characteristics reveal that energetic films presented in this paper have certain safety, high energy, and flexibility and have potential applications in transient electronics with flexible requirements such as micro-electromechanical system.
Substituting electron-donating and electron-accepting substituents on antiaromatic pentalene cores can significantly tune the optical absorption, energy levels, antiaromaticity, and transistor switch-on behavior.
Abstract Although ( E )‐4‐(2‐(4‐(dicyanomethylene)‐4 H ‐chromen‐2‐yl)vinyl)phenolate anion (DCPO − ) has recently emerged as a potential near infrared (NIR) biosensor signaling unit, the p K a value of its conjugate acid is relatively high (∼9); this will lead to relatively low concentrations of DCPO − under physiological conditions and, hence, unsatisfactory sensitivity of DCPO − ‐based bio‐probes. By difluoro‐substitution on DCPO − , we have exploited a new fluorophore of o ‐FDCPO − whose conjugate acid has a much lower p K a value of 7.42. Meanwhile, o ‐FDCPO − is NIR emissive with λ em =693 nm and has a 0.76‐fold higher fluorescence efficiency than DCPO − . The significant superiority of o ‐FDCPO − over DCPO − in sensitivity for NIR biosensor applications was confirmed by comparative studies on two HNO probes, namely o ‐FDCPO‐P and DCPO‐P, which bear signaling units of o ‐FDCPO − and DCPO − , respectively. Moreover, o ‐FDCPO‐P has been demonstrated to be a high‐performance HNO probe with high selectivity, high sensitivity (detection limit: 50 n m ), and a rapid response, together with a two‐photon NIR‐excitation imaging capability.
A feasible constructive strategy for color-tunable UOL materials is demonstrated by utilizing triplet excited state with an intermolecular through-space charge-transfer character as the initial state.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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