Organic electroluminescent device
摘要
說(shuō)明書(shū)
According to one embodiment of the present specification, the first host material having a HOMO energy level of ?5.9 eV or lower means an energy level absolute value increasing in a negative direction from a vacuum level.
According to one embodiment of the present specification, the second host material having a HOMO energy level higher than a HOMO energy level of the first host material by 0.1 eV to 0.2 eV means having an energy level absolute value decreasing in a negative direction from the HOMO energy level of the first host material.
According to one embodiment of the present specification, the first host material has a HOMO energy level of ?5.9 eV or lower, and the second host material has a HOMO energy level higher than a HOMO energy level of the first host material by 0.1 eV to 0.2 eV.
When the first host material and the second host material according to one embodiment of the present specification have HOMO energy levels in the above-mentioned ranges, a driving voltage is reduced and current efficiency is improved compared to using a host material having a deep HOMO energy level alone.
An organic electroluminescent device according to one embodiment of the present specification uses the first host material having a deep HOMO energy level, and the second host material having a HOMO energy level higher than a HOMO energy level of the first host material by 0.1 eV to 0.2 eV, and uses the compound represented by Chemical Formula 1 or Chemical Formula 2 as an electron transfer layer, and as a result, excellent performance is obtained in terms of a driving voltage, current efficiency and/or a lifetime.
