TY - JOUR
T1 - Effect of reverse intersystem crossing rate to suppress efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters
AU - Inoue, Munetomo
AU - Serevičius, Tomas
AU - Nakanotani, Hajime
AU - Yoshida, Kou
AU - Matsushima, Toshinori
AU - Juršenas, Saulius
AU - Adachi, Chihaya
N1 - Funding Information:
This work was supported by the Japan Science and Technology Agency (JST) , ERATO , Adachi Molecular Exciton Engineering Project , and a Grant-in-Aid and Fellowship from the Japan Society for the Promotion of Science (JSPS) . T. SereviĿius acknowledges support of the project ⿿Promotion of Student Scientific Activities⿿ ( VP1-3.1-ŠMM-01-V-02-003 ) from the Research Council of Lithuania .
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2016/1/16
Y1 - 2016/1/16
N2 - Electroluminescence efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN) and 3-(9,9-dimethylacridin-10(9H)-yl)-9H-xanthen-9-one (ACRXTN) is investigated by considering intramolecular exciton relaxation processes. Electroluminescence efficiency roll-off at high current density is dramatically suppressed using ACRXTN as an emitter instead of 2CzPN because of suppressed bimolecular exciton annihilation processes such as singlet-triplet and triplet-triplet annihilation. The rate constant of reverse intersystem crossing from triplet to singlet excited states of ACRXTN is about 300 times higher than that of 2CzPN, decreasing triplet exciton density and suppressing exciton annihilation processes under optical and electrical excitation.
AB - Electroluminescence efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN) and 3-(9,9-dimethylacridin-10(9H)-yl)-9H-xanthen-9-one (ACRXTN) is investigated by considering intramolecular exciton relaxation processes. Electroluminescence efficiency roll-off at high current density is dramatically suppressed using ACRXTN as an emitter instead of 2CzPN because of suppressed bimolecular exciton annihilation processes such as singlet-triplet and triplet-triplet annihilation. The rate constant of reverse intersystem crossing from triplet to singlet excited states of ACRXTN is about 300 times higher than that of 2CzPN, decreasing triplet exciton density and suppressing exciton annihilation processes under optical and electrical excitation.
UR - http://www.scopus.com/inward/record.url?scp=84950241797&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84950241797&partnerID=8YFLogxK
U2 - 10.1016/j.cplett.2015.11.042
DO - 10.1016/j.cplett.2015.11.042
M3 - Article
AN - SCOPUS:84950241797
SN - 0009-2614
VL - 644
SP - 62
EP - 67
JO - Chemical Physics Letters
JF - Chemical Physics Letters
ER -