abstract |
It is an object of the present invention to provide a light emitting agent for an organic light emitting device useful in an organic light emitting device for high durability and its use, and a light emitting agent for an organic light emitting device using a specific coumarin derivative and an organic light emitting device, Then, a display panel and an information display device using the organic light emitting element are provided to solve the above problems.n n n n Coumarin derivatives, display panel |