| abstract |
In the invention, the symmetric 1,3,4-thiazole/oxadiazole is used as the core group, and the rigid group with high electron cloud density is bridged at the 2 and 5 positions to form a class of compounds with high refractive index. The compound is used as a light extraction layer material to cover the cathode to modify the device, which further improves the loss of light inside the device due to total reflection, optical waveguide effect, etc., and avoids the reduction of device life and stability caused by heat accumulation. Improve light extraction efficiency. |