| abstract |
The invention relates to the technical field of organic electroluminescent devices, and discloses a phosphorescent device containing a metal complex of heterocyclic phosphate. The glass transition temperature of the hole transport material is not lower than 85°C. Due to the use of a hole transport material with a high glass transition temperature, the device provided by the present invention can overcome the device failure caused by the temperature of the working device being close to the glass transition temperature of the hole transport material when the ambient temperature is above 30-40°C. Instability and adverse effects on device lifetime. Compared with devices based on FIrpic and TAPC, the phosphorescent device provided by the invention not only has higher device efficiency, but also has better high temperature stability. |