Application of 6-aza-benzophenanthrene derivative to organic light-emitting element

Abstract

The invention provides an application of a 6-aza-benzophenanthrene derivative to an organic light-emitting element. The organic light-emitting element comprises a substrate, an anode, a cathode and at least one electroluminescence structure. The substrate is made of light-transmitting materials. The anode is electrically connected with a positive electrode of an external electric field and suitable for providing electron hole currents. The cathode is electrically connected with a negative electrode of the external electric field and suitable for providing electron currents. The electroluminescence structures are arranged between the anode and the cathode. At least one 6-aza-benzophenanthrene derivative layer is formed in each electroluminescence structure, wherein the material of the 6-aza-benzophenanthrene derivative layer comprises six functional groups R, and the functional groups are independently or simultaneously selected from a nitrile group (nitrile, -CN), a hydrogen group (hydrogen, -H), a carboxylic group (carboxylic, -COOH), a carboxamide group (carboxamide, -CONH2), a trifluoromethyl group (trifluoromethyl, -CF3) and a halogen group (halogen, -halo).

Description

Technical field [0001] The present invention relates to the application of a hexaazatriphenylene derivative, and in particular to the application of a hexaazatriphenylene derivative in an organic light-emitting element. Background technique [0002] The molecular orbitals of compounds can be divided into the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO), where the energy difference between HOMO and vacuum level is equivalent to that of organic materials The ionization potential (ionization potential), the energy difference from LUMO to vacuum level (vacuum level) is equivalent to electron affinity (electron affinity). An organic light emitting device (OLED) contains different organic materials, and heterojunctions are formed between different organic materials. When the anode and cathode of the OLED are respectively electrically connected to the positive and negative electrodes of the external electric field, the external electr...

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Problems solved by technology

However, in most organic semiconductor materials used in OLEDs, the migration rate of holes is much higher than that of electrons, which makes it easy for holes and electrons in OLEDs to combine with the cathode side, and electrons and holes are too close to each other too early. The cathode side combination will reduce the current density in the OLED, resulting in a reduction in the luminous efficiency of the organic light-emitting layer, and in the case where the OLED operating voltage cannot be reduced, the high temperature inside the OLED will rapidly deteriorate the organic material and shorten the life of the OLED.

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