TY - JOUR
T1 - Novel V-Shaped Bipolar Host Materials for Solution-Processed Thermally Activated Delayed Fluorescence OLEDs
AU - Lee, Dong Won
AU - Hwang, Jinhyo
AU - Kim, Hyung Jong
AU - Lee, Hyoseong
AU - Ha, Jung Min
AU - Woo, Han Young
AU - Park, Sungnam
AU - Cho, Min Ju
AU - Choi, Dong Hoon
N1 - Funding Information:
The authors acknowledge financial support from the National Research Foundation (NRF) of Korea (no. NRF2019R1A2C2002647 and NRF2019R1A6A1A11044070) and LG Display Co. Limited (Q1927051 2020). The authors are grateful to the Korea Basic Science Institute (KBSI) for allowing the use of the MALDI-TOF MS instrument and Institute for Basic Science (IBS, Korea) for allowing us to obtain nuclear magnetic resonance data (NMR; Ascend 500, Bruker).
Funding Information:
The authors acknowledge financial support from the National Research Foundation (NRF) of Korea (no. NRF2019R1A2C2002647 and NRF2019R1A6A1A11044070) and LG Display Co. Limited (Q1927051, 2020). The authors are grateful to the Korea Basic Science Institute (KBSI) for allowing the use of the MALDI-TOF MS instrument and Institute for Basic Science (IBS, Korea) for allowing us to obtain nuclear magnetic resonance data (NMR; Ascend 500, Bruker).
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/10/20
Y1 - 2021/10/20
N2 - Three V-shaped host molecules with a cyclohexane linker were successfully synthesized for thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The unipolar host molecules, BBCzC and BTDC, contained two 9-phenyl-9H-3,9′-bicarbazole (PBCz) moieties and two 2,12-di-tert-butyl-7-phenyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (PDBNA) moieties, respectively. BCzTC, a bipolar host molecule, consisted of a donor unit, PBCz, and an acceptor unit, PDBNA, connected by a cyclohexane linker. Three host molecules showed good solubility in various organic solvents, making them suitable for solution processing. Among the solution-processed green TADF-OLEDs using three host molecules and a green TADF emitter, the one with BCzTC showed the highest external quantum efficiency of up to 30% with a high power efficiency of 71 lm W-1 and a current efficiency of 102 cd A-1. Compared with BBCzC and BTDC, BCzTC exhibited a relatively high photoluminescence quantum yield (PLQY), an excellent balance in hole and electron transport properties in the emitting layer, and more efficient energy transfer to the emitter, giving such an excellent device performance.
AB - Three V-shaped host molecules with a cyclohexane linker were successfully synthesized for thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The unipolar host molecules, BBCzC and BTDC, contained two 9-phenyl-9H-3,9′-bicarbazole (PBCz) moieties and two 2,12-di-tert-butyl-7-phenyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (PDBNA) moieties, respectively. BCzTC, a bipolar host molecule, consisted of a donor unit, PBCz, and an acceptor unit, PDBNA, connected by a cyclohexane linker. Three host molecules showed good solubility in various organic solvents, making them suitable for solution processing. Among the solution-processed green TADF-OLEDs using three host molecules and a green TADF emitter, the one with BCzTC showed the highest external quantum efficiency of up to 30% with a high power efficiency of 71 lm W-1 and a current efficiency of 102 cd A-1. Compared with BBCzC and BTDC, BCzTC exhibited a relatively high photoluminescence quantum yield (PLQY), an excellent balance in hole and electron transport properties in the emitting layer, and more efficient energy transfer to the emitter, giving such an excellent device performance.
KW - bipolar host
KW - nonconjugated molecule
KW - organic light-emitting diode
KW - solution process
KW - thermally activated delayed fluorescence
UR - http://www.scopus.com/inward/record.url?scp=85117767076&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c14098
DO - 10.1021/acsami.1c14098
M3 - Article
C2 - 34628848
AN - SCOPUS:85117767076
SN - 1944-8244
VL - 13
SP - 49076
EP - 49084
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 41
ER -