| 초록 |
In this study, the lifetime evaluation was performed by removing the C-N bond and increasing the stability of the molecule by introducing a rigid acceptor group into the host material. The host acts as a matrix to deliver to dopant by forming excitons through recombination of electrons and holes. Therefore, compared to unipolar materials, a bipolar material can receive a balanced transfer of electrons and holes. In addition, molecular stability has a significant impact on device lifetime. Therefore, DOBNA[5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene], a rigid acceptor, was introduced in a representative unipolar host material of 3 species. By applying to the molecule, the C-N bond such as carbazole in the molecule was minimized and the stability of the molecule was increased. As a result, when DOBNA was applied, the external quantum efficiency of all six materials was similar, but it was confirmed that the lifetime increased by a maximum of 4 times. |
