Novel electrophosphorescent material and synthesis method thereof

Abstract

The invention discloses a novel electrophosphorescent material and a synthesis method thereof. The electrophosphorescent material has an organic metal complex with an L2IrX form, and the structure is shown as the following formula, wherein L and X are different bidentate ligands, and L is a type of julolidine derivatives and a first ligand; X is a type of diketone compounds and a second ligand, and Ir is a trivalent Iridium metal ion. When the material is applied to electroluminescent devices, the material has good device efficiency and great application prospect. When the brightness of the best device is 100cd/m<2>, the external quantum efficiency is 7.3%, and the lumen efficiency is 24lm/w.

Description

technical field The invention belongs to the field of synthesis of organic electroluminescent phosphorescent materials, in particular to a class of iridium complex electroluminescent materials and a synthesis method thereof. Background technique Compared with organic electroluminescent technology, the organic electrophosphorescent device (PHOLED) technology, which was born in 1998, can simultaneously utilize triplet and singlet excitons, and the maximum internal quantum efficiency can be from 25% [1] Boost to nearly 100% [2-3] Therefore, the luminous brightness, efficiency and life of PHOLED have been greatly improved compared with fluorescent OLED. It is considered to be one of the most breakthrough discoveries in the field of OLED research, and it has developed rapidly in the last ten years. A large number of heavy metal complexes with high phosphorescent quantum yield at room temperature, such as iridium, platinum, osmium, ruthenium, rhenium, copper, gold and other metal...

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Problems solved by technology

Compared with the efficiency of fluorescent lamps (lumen efficiency ~ 90lm / W), there is still a certain gap

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