Increased resonance: The selective tuning of the optoelectronic properties of organic semiconductors is possible by enantiotropic resonance variation. Using resonance forms of N(+)=P-O(-) in a series of arylamine-phosphine oxide hybrids afforded low-voltage-driven phosphorescent OLEDs with outstanding performances.

A novel conjugated asymmetric donor-acceptor (CADA) strategy for preventing the redshift in photoluminescence, as well as preserving the merits of donor-acceptor architectures, was proposed and demonstrated for two triazine derivatives, which showed highly efficient, narrow, and blueshifted ultraviolet light emission in solid films along with special aggregation-induced emission behavior. A mechanism of aggregation-induced locally excited-state emission by suppressing the twisted intramolecular charge-transfer emission for the spectacular optoelectronic phenomena of these CADA molecules was suggested on the basis of both experimental measurements and theoretical calculations. By taking advantage of this special CADA architecture, fluorescent probes based on aggregates of conjugated asymmetric triazines in THF/water for the detection of explosives show superamplified detection of picric acid with high quenching constants (>1.0 × 10(7) M(-1)) and a low detection limit of 15 ppb.

Given the fundamental importance in charge transport engineering for device operation in molecular electronics, the manipulating strategies and material design principles for a desired application are highly expected. In stark contrast to conventional organic electronic devices, designing organic semiconductors that perform effectively as molecular nanofuse remains a challenge. Based on a novel silicon-containing π-stacked polymer of silafluorene (PVMSiF), we successfully fabricated a molecular nanofuse device with high ON/OFF ratio up to 4×10 6 for the first time. Using a combination of absorption and photoluminescence (PL) spectra, X-ray techniques (XRD), and micro-PL analysis supported by theoretical insights into unit and backbone geometries and wave function delocalizations provided by density functional theory (DFT) and molecular dynamics (MD) simulations, we demonstrate the fundamental correlations between the polymer structures and the spectacular fuse-like resistive switching behaviors. It was shown that the manipulation of charge transport in π-stacked polymer is applicable via silicon incorporation to realize the molecular nanofuse device of the π-stacked polymers, following a silicon-stimulated filament mechanism with breakable π-π stacking at charged states. These findings may have important consequences on future material studies and device applications.

Verstärkte Resonanz: Das selektive Einstellen der optoelektronischen Eigenschaften von organischen Halbleitern ist durch enantiotrope Resonanzvariation möglich. Der Einsatz von N+PO−‐Resonanzformen in einer Reihe von Arylamin‐Phosphinoxid‐Hybriden ergab organische Phosphoreszenzleuchtdioden mit geringen Betriebsspannungen und hervorragenden Leistungsmerkmalen.