| abstract |
The present invention relates to thermally activated delayed fluorescence small molecules, polymers, organic electroluminescence devices and preparation methods, and the structural formula of the thermally activated delayed fluorescence small molecule materials is shown in formula (1). wherein R 1 includes an alkyl group. The end groups of thermally activated delayed fluorescence small molecule materials and polymers are further selected from alkyl groups to make them have good solubility, so they can be placed in the device in the form of a solution to play a role, avoiding the high vacuum requirements of the evaporation process, The disadvantages of complicated operation and high cost. At the same time, the end group of the thermally activated delayed fluorescent small molecule material is selected from alkyl groups, so that the energy level difference between the lowest singlet excited state and the lowest triplet excited state is significantly reduced, the maximum external quantum efficiency is significantly improved, and it has the lowest unoccupied molecular orbital (LUMO ) and the highest occupied molecular orbital (HOMO) separation, solvent discoloration effect and good stability and other advantages. |