Synthesis And Properties Of Thermally Activated Delayed Fluorescent Materials Sensitized Metal Iridium Complex Phosphorescent Luminescent Material

Since the development of organic electroluminescent diodes(OLEDs)for 30 years,major breakthroughs have been made in materials and devices.Due to the continuous deepening of research on OLEDs,in commercial applications,it has gradually become the first choice to replace traditional liquid crystal displays in the future.At present,OLEDs are mainly based on the research of second-generation phosphorescent luminescent materials and third-generation thermally activated delayed fluorescence(TADF)materials.However,phosphorescent luminescent materials lack stable and efficient blue luminescent materials and corresponding stable operation Blue light device.TADF luminescent materials urgently need to solve the problems of reducing the energy level difference between singlet and triplet states,improving quantum efficiency and solubility,film-forming properties and device stability.In this paper,based on the concept of molecular sensitization,a thermally activated delayed fluorescence sensitized metal iridium complex phosphorescent light emitting material(TADF-Ir)is developed,that is,the modified classic FIrpic phosphorescent light emitting unit and carbazole-three The TADF light-emitting unit of the azine derivative is connected,and at the same time,the high radiation attenuation rate of the phosphorescent unit and the high anti-intersystem jump rate of the TADF unit are used.It is hoped that a class of light-emitting materials with high efficiency and long working life will be obtained.We tested the performance of TADF-Ir materials such as ultraviolet-visible spectrum,fluorescence emission spectrum,cyclic voltammetry curve and quantum yield(PLQY).The glass transition temperature of TADF-Ir material can reach 192?,and the efficiency of PLQY is also increased from 38.2%to 65.4%of metal iridium complex.The results show that the performance of the TADF-sensitized metal iridium complex phosphorescent material basically conforms to the experimental hypothesis that energy can be effectively transferred from the TADF light-emitting unit to the phosphorescent light-emitting unit,and the TADF unit wraps the phosphorescent light-emitting unit,effectively avoiding the quenching of Ir Extinguishes and improves the luminous efficiency of the material.