3results about How to "Reduced efficiency roll-off" patented technology

This invention provides an anthracene-based fluorescent material, its preparation method, and its applications. The anthracene-based fluorescent material is as shown in Compound I. The compounds of this invention utilize the electron-donating effect of aromatic amine units such as carbazole and the electron-withdrawing effect of phosphonyl / sulfonyl groups, effectively improving the electron and hole transport capabilities of the molecules. Furthermore, the steric hindrance effect, resulting in a distorted molecular configuration, can suppress intermolecular interactions, thereby reducing the device efficiency roll-off caused by concentration quenching. The thermal exciton mechanism enables these molecules to achieve an exciton utilization rate exceeding that of traditional fluorescent molecules by 25%.

The invention provides an organic compound taking a dibenzopyrone-like fused ring as a core, a preparation method and application of the organic compound, and application of an organic electroluminescent device, and relates to the field of semiconductors. The organic compound provided by the invention takes a dibenzopyrone-like fused ring as a parent nucleus and is connected with a planar rigid branch chain, so that the structure of the material is more stable, the material has high Tg temperature, active C-H bonds in molecules are passivated, and the service life of the organic compound is prolonged; chemical bonds of the organic compound have relatively high bond energy, so that the service life is further prolonged; the combination form of the dibenzopyrone-like fused ring and the planar rigid branched chain structure can effectively increase steric hindrance, slow down efficiency roll-off under high current density, and further prolong the service life; the compound contains a planar rigid branch chain and a specific connection site and connection mode between the planar rigid branch chain and a core structure, so that the intermolecular charge jumping transmission rate can be increased, and the current efficiency is improved.

Organic electroluminescent materials and devices thereof are disclosed. The organic electroluminescent material is a metal complex containing a La ligand with a structure shown in a formula 1 and an Lb ligand with a structure shown in a formula 2. When the novel metal complexes are applied to electroluminescent devices, more saturated green light emission and lower efficiency roll-off can be obtained, more choices are provided for application of phosphorescent OLED materials and devices in high-brightness scenes, meanwhile, the metal complexes have lower device capacitance in the devices, and the application range of the metal complexes is widened. And the response rate of the OLED display device at a low gray scale can be improved, and the refresh frequency of the device can be improved. The metal complex has huge advantages and wide prospects in industrial application. Also disclosed are an organic electroluminescent device comprising the metal complex and a composition comprising the metal complex.