Jun Kodama

45.3: Tetra‐Substituted Pyrenes: New Class of Blue Emitter for Organic Light‐Emitting Diodes

We have developed a new class of highly-fluorescent blue emitter for organic light-emitting diodes (OLEDs) consisting of tetra-substituted pyrenes. From the analysis of the excited state diagrams of pyrene and its derivatives by molecular orbital calculations, we found that the new tetra-substituted pyrenes are highly fluorescent. OLEDs fabricated using the synthesized tetra-substituted pyrenes as emitters showed high efficiency and good color purity.

Adsorption and Oxidation Species on a-SiC:H Surface by Corona Exposure

The hydrogenated amorphous silicon (a-Si:H) photoreceptor used in printing systems produces image blurring at high temperature and humidity. We have examined the problem using infrared reflective-absorption spectroscopy (IR-RAS). We exposed a hydrogenated amorphous silicon carbide (a-SiC:H) film to a corona discharge at 35°C and 80% RH. Adsorption and oxidation species on the film can be detected and determined by IR-RAS. NO3-, CO32-, Si-OH, H-OH, and Si-O-Si are detectable in the a-SiC:H film. The amount of them increases with corona exposure time. We clarify that these specids in a-SiC:H film cause the contact angles to decrease with the corona exposure time and blur the image.