abstract |
(57) [Problem] To provide a luminescent agent for an organic electroluminescent device useful in an organic electroluminescent device aiming at high durability and a use thereof. SOLUTION: A light emitting auxiliary agent for an organic electroluminescent device using a specific coumarin derivative, an organic electroluminescent device using the auxiliary agent for an organic electroluminescent device, a display panel and an information display device using the organic electroluminescent device The above-mentioned subject is solved by providing. |