| abstract |
The present invention provides a novel material of formula (1) or formula (2) and an organic electroluminescent device using the material, which uses the material as a phosphorescent host of a light emitting layer, a delay of a light emitting layer and a hole blocking layer Fluorescent dopants have good performance, such as low driving voltage, low power consumption, high efficiency and long life.nn n n n n n n n n n n n n n n n n The definitions of m, X 1 to X 4 and R 1 to R 6 are the same as described in the present invention. |