TY - JOUR
T1 - Emitting layer analysis of blue thermally activated delayed fluorescence devices using capacitance–voltage method
AU - Park, Soo Jong
AU - Choi, Younguk
AU - Choi, Kwang Wook
AU - Lee, Seungwon
AU - Choi, Minjeong
AU - Park, Jun Young
AU - Park, Jaewon
AU - Kim, Soojin
AU - Ju, Byeong Kwon
N1 - Funding Information:
This work was supported by Samsung Display Co. Ltd. , and the Brain Korea 21 Plus Project in 2021 .
Publisher Copyright:
© 2021 Korean Physical Society
PY - 2021/11
Y1 - 2021/11
N2 - In this paper, blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have been elucidated, with a focus on the degradation characteristics of the emission layer (EML). The operational stability against electrical stress was investigated for two host materials and four doping concentrations, which were used as the EML. The operating stability of the devices was confirmed by comparing the peak capacitance before and after degradation. Devices using bis [2-(diphenyl-phosphino) phenyl] ether oxide (DPEPO) as a host exhibited poor degradation characteristics. However, high stability was confirmed when 3,3-di (9H-carba-zol-9-yl)-biphenyl (mCBP) was used. DPEPO host devices are most resistant against performance degradation when they are doped with 10 wt% 10,10'-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine (DMAC-DPS). We successfully determined the electroluminescence characteristics of the device depending on the host material, as well as the doping concentration, using the capacitance–voltage method.
AB - In this paper, blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have been elucidated, with a focus on the degradation characteristics of the emission layer (EML). The operational stability against electrical stress was investigated for two host materials and four doping concentrations, which were used as the EML. The operating stability of the devices was confirmed by comparing the peak capacitance before and after degradation. Devices using bis [2-(diphenyl-phosphino) phenyl] ether oxide (DPEPO) as a host exhibited poor degradation characteristics. However, high stability was confirmed when 3,3-di (9H-carba-zol-9-yl)-biphenyl (mCBP) was used. DPEPO host devices are most resistant against performance degradation when they are doped with 10 wt% 10,10'-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine (DMAC-DPS). We successfully determined the electroluminescence characteristics of the device depending on the host material, as well as the doping concentration, using the capacitance–voltage method.
KW - Capacitance–voltage
KW - Degradation
KW - Organic light-emitting diode
KW - Thermally activated delayed fluorescence
UR - http://www.scopus.com/inward/record.url?scp=85111743368&partnerID=8YFLogxK
U2 - 10.1016/j.cap.2021.07.017
DO - 10.1016/j.cap.2021.07.017
M3 - Article
AN - SCOPUS:85111743368
SN - 1567-1739
VL - 31
SP - 46
EP - 51
JO - Current Applied Physics
JF - Current Applied Physics
ER -