Long-lifetime organic electroluminescent compound and organic electroluminescent device comprising the same

Abstract

There is provided a long-lifetime organic electroluminescent compound and an organic electroluminescent device comprising the same. The general structural formula of the organic electroluminescent compound is as shown in Formula I. The organic electroluminescent compound contains a benzonaphthofuran moiety. By means of the benzonaphthofuran structure instead of dibenzofuran, the conjugated length of π electron cloud is prolonged. When the molecule is converted into an anionic state after accepting electrons, the negative charges can be effectively dispersed on the benzonaphthofuran moiety, avoiding excessively high local energy caused by uneven distribution of the negative charges, thus increasing the stability of a material. Furthermore, the benzonaphthofuran moiety has also been found to have a relatively good planarity, and the stability of the material can be significantly improved by means of partial deuteration. In the present invention, by means of deuteration at some sites on the benzonaphthofuran structure, the vibration of carbon-hydrogen bonds can be significantly reduced, the stability of the benzonaphthofuran can be enhanced, and the deuteration cost can be reduced.