Organic compound, light-emitting element, light-emitting device, electronic device, and lighting device
摘要
說明書
For this reason, the material 131 preferably has a function of converting a triplet exciton into a singlet exciton by reverse intersystem crossing. Accordingly, the material 131 is preferably a thermally activated delayed fluorescence material. That is, the compound of one embodiment of the present invention which has a bicarbazole skeleton and a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton can be used as the material 131.
A difference between the singlet excitation energy level and the triplet excitation energy level of the material 131 is preferably greater than 0 eV and less than or equal to 0.3 eV, more preferably greater than 0 eV and less than or equal to 0.2 eV, further more preferably greater than 0 eV and less than or equal to 0.1 eV.
TADF (131): the material 131;
Host (132): the host material 132;
SA: the S1 level of the material 131;
TA: the T1 level of the material 131;
SH: the S1 level of the host material 132; and
TH: the T1 level of the host material 132.
