| abstract |
The present invention provides a metal complex as a phosphorescent emitter in an organic electroluminescent device (OLED) that has improved solubility and also provides improved efficiency and lifetime. For example, it is synthesized by reacting an iridium complex compound IX having the following formula and a compound II in a p-xylene suspension in the presence of potassium phosphate, palladium acetate and tri-tert-butylphosphine. Compound X. [Selection figure] None |