TY - JOUR
T1 - Highly Efficient Red-Emitting OLEDs Prepared from Nona-Coordinated Europium(III) Complexes
AU - Ilmi, Rashid
AU - Xia, Xiaoyang
AU - Dutra, José D.L.
AU - Santos, Gabriel Silva
AU - Zhou, Liang
AU - Wong, Wai Yeung
AU - Raithby, Paul R.
AU - Khan, Muhammad S.
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/4/2
Y1 - 2024/4/2
N2 - We have designed and synthesized three nona-coordinated organoeuropium complexes (OEuCs) with the general formula [Eu(btfa)3(FurTerPy)] (Eu1), [Eu(btfa)3(ThioTerPy)] (Eu2), and [Eu(btfa)3(NapTerPy)] (Eu3) by employing a primary 4,4,4-trifluoro-1-phenyl-1,3-butanedione (btfa) antenna ligand and three functionalized 2,2′:6′,2″-terpyridine (TerPy) ligands bearing different electron-donating groups at the 4′ position, namely, FurTerPy = 4′-(furan-2-yl)-2,2′:6′,2″-terpyridine; ThioTerPy = 4′-(thiophen-2-yl)-2,2′:6′,2″-terpyridine; and NapTerPy = 4′-(naphthalen-1-yl)-2,2′:6′,2″-terpyridine. The detailed photophysical properties of Eu1, Eu2, and Eu3 were analyzed using both experimental and computational methods. By analyzing the experimental and time-dependent density functional theory (TD-DFT) data in conjunction with the Lanthanide Luminescence Software Package (LUMPAC), we further elucidated the energy transfer processes in the OEuCs. Finally, the complexes were tested as the emitting layer (EML) in a multilayered device to fabricate red organic light-emitting diodes (R-OLED). Through optimization and device engineering, we have achieved a remarkable electroluminescence (EL) performance of maximum current efficiency (ηc) = 12.32 cd/A, maximum power efficiency (ηp) = 11.73 lm/W, and maximum external quantum efficiency (EQEmax) = 10.20%, respectively, for the Eu3-based double-EML OLED. To the best of our knowledge, this is the highest reported overall EL performance among the OEuCs until now.
AB - We have designed and synthesized three nona-coordinated organoeuropium complexes (OEuCs) with the general formula [Eu(btfa)3(FurTerPy)] (Eu1), [Eu(btfa)3(ThioTerPy)] (Eu2), and [Eu(btfa)3(NapTerPy)] (Eu3) by employing a primary 4,4,4-trifluoro-1-phenyl-1,3-butanedione (btfa) antenna ligand and three functionalized 2,2′:6′,2″-terpyridine (TerPy) ligands bearing different electron-donating groups at the 4′ position, namely, FurTerPy = 4′-(furan-2-yl)-2,2′:6′,2″-terpyridine; ThioTerPy = 4′-(thiophen-2-yl)-2,2′:6′,2″-terpyridine; and NapTerPy = 4′-(naphthalen-1-yl)-2,2′:6′,2″-terpyridine. The detailed photophysical properties of Eu1, Eu2, and Eu3 were analyzed using both experimental and computational methods. By analyzing the experimental and time-dependent density functional theory (TD-DFT) data in conjunction with the Lanthanide Luminescence Software Package (LUMPAC), we further elucidated the energy transfer processes in the OEuCs. Finally, the complexes were tested as the emitting layer (EML) in a multilayered device to fabricate red organic light-emitting diodes (R-OLED). Through optimization and device engineering, we have achieved a remarkable electroluminescence (EL) performance of maximum current efficiency (ηc) = 12.32 cd/A, maximum power efficiency (ηp) = 11.73 lm/W, and maximum external quantum efficiency (EQEmax) = 10.20%, respectively, for the Eu3-based double-EML OLED. To the best of our knowledge, this is the highest reported overall EL performance among the OEuCs until now.
KW - 4,4,4-trifluoro-1-phenyl-1,3-butanedione
KW - carrier trapping
KW - energy transfer mechanism
KW - europium(III)
KW - Förster energy transfer
KW - red electroluminescence
KW - terpyridine
UR - http://www.scopus.com/inward/record.url?scp=85189530481&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85189530481&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/c8228565-902e-3822-8e27-6ac58dcae039/
U2 - 10.1021/acsaelm.4c00208
DO - 10.1021/acsaelm.4c00208
M3 - Article
AN - SCOPUS:85189530481
SN - 2637-6113
JO - ACS Applied Electronic Materials
JF - ACS Applied Electronic Materials
ER -