摘要:
Biphenyl derivatives having four substituents at meta positions of biphenyl structure, which is a core molecular structure, and organic electroluminescent devices using the biphenyl derivatives. The biphenyl derivatives are phosphorescent host compounds having amorphous structures and have excellent thermal stability and high solubility in general organic solvents, is easily to use for solution (or wet) process, and can easily energy-transfer to a metal complex used as dopant. The biphenyl derivatives also can be used as blue host materials of phosphorescent emission layer, hole transporting materials, or a hole injecting materials of an organic electroluminescent device.