MATERIAL AND DEVICE FOR BLUE PHOSPHORESCENCE-BASED ORGANIC LIGHT-EMITTING DIODE

摘要

PROBLEM TO BE SOLVED: To provide a highly efficient organic light-emitting device (OLED), in particular, an OLED having a light-emitting layer including a phosphorescent dopant material and a charge carrying dopant material that are doped in an inert host material. SOLUTION: The OLED includes a wide gap inert host material doped with two dopants. One of the dopants is a phosphorescent material that can transport either electrons or holes. The other dopant is a charge carrying material that can transport either the electrons or holes that is not transported by the phosphorescent dopant. The materials are selected such that the lowest triplet state energy level of the host material and the lowest triplet state energy level of the charge carrying dopant material are each at a higher energy level than the lowest triplet state energy level of the phosphorescent dopant material. The device is particularly capable of efficiently emitting light in the blue region of the visible spectrum. COPYRIGHT: (C)2010,JPO&INPIT