| abstract |
The present invention discloses an organic electroluminescent device and a manufacturing method thereof. The host material of the light-emitting layer of the organic electroluminescent device is material in which the triplet state energy level of the CT excited state is higher than that of the n-π excited state by 0 to 0.3 eV; or the triplet state of the host material of the light-emitting layer is higher than that of the n-π excited state by more than 1.0 eV; in addition, the difference in energy level between the second triplet state of the n-π state and the first singlet state of the CT excited state is −0.1 to 0.1 eV; and the luminescent dye is a fluorescent dye. With regard to the organic electroluminescent device in the present invention, as new host material in the light-emitting layer is used and the host material has a donor group and an acceptor group, the triplet state in the light-emitting layer may be fully utilized to achieve a 100% light-emitting efficiency in the fluorescent device. Furthermore, no noble metal is required to be used, thus reducing the cost. |