Compound for organic electric element, organic electric element comprising the same, and electronic device thereof
摘要
說明書
In Comparative Examples 1 to 3, Comparative Compounds A to C were used as material for an emission-auxiliary layer, respectively. Comparative compounds A to C are the same in that two identical amine groups are bonded to the benzene ring of the dibenzofuran core, but the bonding positions of the amine groups are different from each other. It was confirmed that efficiency and lifespan as well as driving voltage were improved where the Comparative compound C in which the amine group was bonded to 2-position and 7-position of the dibenzofuran, respectively. That is, it can be seen that the performance of the device is improved where the comparative compound C in which the amine group is asymmetrically bonded to the dibenzofuran (bonded at positions 2 and 7) is used as an emission-auxiliary layer material, compared to where Comparative Compound A (bonded at positions 2 and 8 of dibenzofuran) or Comparative Compound B (bonded at positions 3 and 7 of dibenzofuran) in which amine groups are symmetrically bonded to dibenzofuran.
In the specification, the numbering for dibenzofuran or dibenzothiophene is as follows.
From these results, it can be seen that even if the cores are the same, device characteristics vary depending on the bonding position of the amine group. It seems that this is because the value of energy level (especially HOMO level) and physical properties are changed depending on the bonding position of the amine group, and this change acts as a major factor in improving the performance of the device when material is deposited during manufacturing of device.
