Organic Nanoclusters on Inorganic Nanostructures for Tailoring the Emission Properties of Organic Materials

Abstract

Inorganic nanostructures have been intensively studied because of their size‐dependent emission color as a result of quantum confinement effects. In contrast, no significant size dependence of the optical properties is expected for organic nanostructures owing to the weak nearest‐neighbor interactions in molecular crystals; however, the optical properties of organic materials can be significantly affected by aggregation and molecular packing, which can result in large differences between the emission spectra of solutions and thin films. Thus, the emission spectra of organic nanostructures may differ considerably from the bulk material despite the absence of quantum confinement effects. We demonstrate that 3,4,9,10‐perylenetetracarboxylicdiimide (PTCDI) nanoclusters grown on ZnO nanorods exhibit an intense blue‐white photoluminescence, different from the weak red emission of PTCDI films. Light emitting diodes consisting of ZnO nanorods and PTCDI nanoclusters also exhibited white emission.

Self‐Assembled PDINH Supramolecular System for Photocatalysis under Visible Light

“…It is notable that, in comparison with selfassembled PDINH supramolecular system which underwent air drying under room temperature, the product which underwent oven drying at 60 °C ( Figure S5B, Supporting Information) shows clearer lattice fringes, among which the clear d-spacing of 2.40 Å can be attributed to the lattice spacing for (002) planes, indicating a higher crystallinity. [40] Strong π-π stacking interactions in the self-assembled PDINH supramolecular system can be revealed from observation of absorption spectra. Distinct change in absorption spectra appeared after monomeric PDINH molecules selfassembling into the supramolecular system (solid state), demonstrating great variation in optical and electronic properties of self-assembled PDINH supramolecular system.…”

Organic Nanowire Fabrication and Device Applications

“…Furthermore, accurate control of layer thickness is more challenging in ONW‐based light‐emitting devices than in thin film‐based devices. In spite of these challenges, many researchers are attempting to develop ONW‐based light‐emitting devices because they can be possibly used as nanoscale light emitters for optoelectronic integrated circuits and lab‐on‐a‐chip devices and can provide a chance to study anisotropic electroluminescence (EL) of organic materials …”

“…Using organic/inorganic hybrid NWs grown by PVT as light‐emitters provided an effective way to analyze the emission properties of organic materials with their aggregation and molecular packing . PTCDI/ZnO hybrid NWs were prepared using PVT on indium tin oxide (ITO) substrates and incorporated in light‐emitting devices.…”

A Cationic Gold(I) Complex as a General Catalyst for the Intermolecular Hydroamination of Alkynes: Application to the One‐Pot Synthesis of Allenes from Two Alkynes and a Sacrificial Amine

“…Semiconducting nanocrystals that contain quantum dots exhibit tunable energy band gaps and luminescence characteristics arising from the quantum‐size effect 6, 7. Organic crystals and their nanostructures show two types of size effect: the conventional quantum‐confinement effect for samples smaller than 10 nm and the finite‐size effect involving variations in the optical absorption and emission spectra 8, 9. These have contributed to the development of efficient optoelectronic devices 8, 10…”