The nature of the interface between the light-emitting layer and the metal electrode is of importance in determining device performance. The heat treatment of the electroluminescence device can enhance the adhesion of the polymer on the electrode by reducing free volume or pores in the interface. The current–voltage–luminance characteristic of the device with heat treatment at various temperatures was investigated. The annealed device above glass transition temperature (Tg) showed the most efficient characteristics. The current density was increased about 20 times over that of the unannealed device. The light intensity was also increased dramatically by 40 times.

Metal-mediated self-assembly of chelating double-hydrophilic block copolymer has become a facile preparation strategy of great importance for the metal-chelated hybrid nanostructures. Herein, we present a delicate control over the morphology regulation of metal-chelated nanostructures by a terminal modification of polymer building blocks with mesogenic cholesterol. Such a molecular design motif at an end of chelating linear/brush-type block copolymer imparts not only additional hydrophobicity for enhanced cohesive force to facilitate the metal-mediated self-assembly, but also significant morphological alteration of a metal-chelated core that otherwise generally forms a spherical interior with cholesterol-free block copolymers. The presence of cholesterol entities localized at the central core further allows for the density modulation of the final PtII-chelated nanostructures while maintaining the colloidal stability, comparable to that of the cholesterol-free nanoparticles in physiological conditions. This metal-mediated assembly strategy with modified polymer building blocks can provide a potential platform for the delivery of inorganic agents.

No abstract

No abstract

No abstract