| abstract |
An improved organic light emitting device is provided. In an organic light emitting device (OLED), a bipolar carbazole group material according to the following general formula is used as a host material in a guest-host layer such as a light-emitting layer and / or one charge transport layer. In the above general formula, R 1 represents an electron donating moiety or an electron accepting moiety, each R 2 to R 7 is optionally present, and each R 2 to R 7 independently represents an electron donating moiety or an electron accepting moiety. Represent. [Selection diagram] None |