| 摘要 |
The objective of the present invention is to provide an organic electroluminescent element which has an improved element service life, and wherein a host compound and a dopant have excellent stability in excited states. This organic electroluminescent element is provided with a pair of electrodes and an organic layer arranged between the pair of electrodes, and is characterized in that: the light emitting layer contains a thermally activated delayed fluorescent host compound and a phosphorescent metal complex dopant; and the singlet energy transfer efficiency of the host compound to the phosphorescent metal complex dopant is within the range of 10-100%. |
