Write-Once-Read-Many Memory Characteristics of a Conjugated Ionic Polymer with Propagyl Moieties

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Highly efficient, conventional and flexible deep-red phosphorescent OLEDs using ambipolar thiophene/selenophene-phenylquinoline ligand-based Ir(III) complexes

Highly efficient conventional and flexible deep-red phosphorescent OLEDs (PhOLEDs) were developed by using glass (substrate)/indium tin oxide (ITO, transparent conducting electrode, TCE) and polyethylene naphthalate (PEN, substrate)/silver nanowire (AgNW, TCE). A thiophene-phenylquinoline (Th-PQ)-based Ir(III) complex, (Th-PQ)3Ir, which has already been confirmed as a promising emitter in solution-processed PhOLEDs, and a new selenophene-PQ (Se-PQ)-based Ir(III) complex, (Se-PQ)3Ir, were verified as emitters in conventional and flexible PhOLEDs. Both (Th-PQ)3Ir and (Se-PQ)3Ir exhibited bright red emission (601 nm and 614 nm) in chloroform at room temperature. (Th-PQ)3Ir showed excellent performance not only in solution-processed devices but also in the conventional and flexible PhOLEDs fabricated by vapor deposition. (Th-PQ)3Ir exhibited a maximum external quantum efficiency (EQE) of 19.83% and 21.33% in conventional and flexible PhOLEDs, respectively, with stable deep-red CIE coordinates (0.66, 0.34). © 2016 Elsevier Ltd

Electrically permanent memory characteristics of an ionic conjugated polymer

In this work, an ionic conjugated polymer with propargyl side groups (poly(2-ethynylpyridinum bromide); PEP-P) was synthesized. High-quality thin films with smooth surfaces were prepared from this polymer on silicon substrates and metal electrodes, via a conventional, simple solution-coating and drying process. Synchrotron X-ray scattering analysis showed that the polymer in the nanoscale thin films was amorphous, but was somewhat preferentially oriented in the film plane, rather than randomly oriented. Using synchrotron X-ray reflectivity analysis, the electron densities and interfaces between the polymer film layers and the silicon substrate and metal electrodes were examined in detail. To our knowledge, PEP-P is the first ionic conjugated polymer to be shown to exhibit electrically nonvolatile memory behavior. The polymer in the nanoscale thin films showed excellent write-once-read-many-times (WORM) memory characteristics, without any polarity. The switching-ON voltage was lower than 1.5 V. WORM memory devices based on PEP-P were highly stable, even under ambient air conditions. PEP-P therefore has great potential as a candidate material for the low-cost mass production of high-performance, programmable unipolar WORM memory devices with very low power consumption.X114943sciescopu

Preparation of Doxorubicin-Loaded Amphiphilic Poly(D,L-Lactide-Co-Glycolide)-b-Poly(N-Acryloylmorpholine) AB(2)Miktoarm Star Block Copolymers for Anticancer Drug Delivery

Owing to their unique topology and physical properties, micelles based on miktoarm amphiphilic star block copolymers play an important role in the biomedical field for drug delivery. Herein, we developed a series of AB(2)-type poly(D,L-lactide-co-glycolide)-b-poly(N-acryloyl morpholine) (PLGA-b-PNAM(2)) miktoarm star block copolymers by reversible addition-fragmentation chain-transfer polymerization and ring-opening copolymerization. The resulting miktoarm star polymers were investigated by(1)H NMR spectroscopy and gel permeation chromatography. The critical micellar concentration value of the micelles increases with an increase in PNAM block length. As revealed by transmission electron microscopy and dynamic light scattering, the amphiphilic miktoarm star block copolymers can self-assemble to form spherical micellar aggregates in water. The anticancer drug doxorubicin (DOX) was encapsulated by polymeric micelles; the drug-loading efficiency and drug-loading content of the DOX-loaded micelles were 81.7% and 9.1%, respectively. Acidic environments triggered the dissociation of the polymeric micelles, which led to the more release of DOX in pH 6.4 than pH 7.4. The amphiphilic PLGA-b-PNAM(2)miktoarm star block copolymers may have broad application as nanocarriers for controlled drug delivery.11Nsciescopu