| abstract |
The invention relates to the technical field of organic light emitting, in particular to a light emitting device. The light-emitting device includes a first electrode, a second electrode, and at least one organic light-emitting layer arranged between the first electrode and the second electrode. The organic light-emitting layer contains a host material, a metal-assisted delayed fluorescence sensitizer, and a fluorescence quencher; The metal-assisted delayed fluorescence sensitizer is an organic material that transfers the triplet excitons and singlet excitons generated by electroluminescence to the fluorescence quencher; the fluorescence quencher transfers the energy of all triplet excitons to the singlet state Exciton, and a fluorescent light-emitting material that uses singlet excitons to emit light. The light-emitting device of the present invention has a very high energy utilization rate through the management of excitons in the organic light-emitting layer, and significantly improves the luminous efficiency and service life of the light-emitting device. |