| 摘要 |
<p>Disclosed is a novel compound which is based on aza- and diazo dibenzofuran; and aza- and diaza dibenzothiophene, for example benzothieno- and benzofuro pyrimidine, and benzothieno- and benzofuro pyrazine which are useful as an electron-transfer host material in a green, red, yellow, and white phosphorescent discharge device.</p> |
