A Yellow-Emitting Homoleptic Iridium(III) Complex
Constructed from a Multifunctional Spiro Ligand for Highly Efficient
Phosphorescent Organic Light-Emitting Diodes
Posted on 2017-06-28 - 12:04
To suppress concentration
quenching and to improve charge-carrier injection/transport in the
emission layer (EML) of phosphorescent organic light-emitting diodes
(PhOLEDs), a facial homoleptic iridium(III) complex emitter with amorphous
characteristics was designed and prepared in one step from a multifunctional
spiro ligand containing spiro[fluorene-9,9′-xanthene] (SFX)
unit. Single-crystal X-ray analysis of the resulting fac-Ir(SFXpy)3 complex revealed an enlarged Ir···Ir
distance and negligible intermolecular π–π interactions
between the spiro ligands. The emitter exhibits yellow emission and
almost equal energy levels compared to the commercial phosphor iridium(III)
bis(4-phenylthieno[3,2-c]pyridinato-N,C2′)acetylacetonate (PO-01).
Dry-processed devices using a common host, 4,4′-bis(N-carbazolyl)-1,1′-biphenyl, and the fac-Ir(SFXpy)3 emitter at a doping concentration of 15 wt
% exhibited a peak performance of 46.2 cd A–1, 36.3
lm W–1, and 12.1% for the current efficiency (CE),
power efficiency (PE), and external quantum efficiency (EQE), respectively.
Compared to control devices using PO-01 as the dopant, the fac-Ir(SFXpy)3-based devices remained superior
in the doping range between 8 and 15 wt %. The current densities went
up with increasing doping concentration at the same driving voltage,
while the roll-offs remain relatively low even at high doping levels.
The superior performance of the new emitter-based devices was ascribed
to key roles of the spiro ligand for suppressing aggregation and assisting
charge-carrier injection/transport. Benefiting from the amorphous
stability of the emitter, the wet-processed device also exhibited
respectful CE, PE, and EQE of 32.2 cd A–1, 22.1
lm W–1, and 11.3%, respectively, while the EQE roll-off
was as low as 1.7% at the luminance of 1000 cd m–2. The three-dimensional geometry and binary-conjugation features
render SFX the ideal multifunctional module for suppressing concentration
quenching, facilitating charge-carrier injection/transport, and improving
the amorphous stability of iridium(III)-based phosphorescent emitters.
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Ren, Bao-Yi; Guo, Run-Da; Zhong, Dao-Kun; Ou, Chang-Jin; Xiong, Gang; Zhao, Xiang-Hua; et al. (2017). A Yellow-Emitting Homoleptic Iridium(III) Complex
Constructed from a Multifunctional Spiro Ligand for Highly Efficient
Phosphorescent Organic Light-Emitting Diodes. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.7b01034
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AUTHORS (15)
BR
Bao-Yi Ren
RG
Run-Da Guo
DZ
Dao-Kun Zhong
CO
Chang-Jin Ou
GX
Gang Xiong
XZ
Xiang-Hua Zhao
YS
Ya-Guang Sun
MJ
Matthew Jurow
JK
Jun Kang
YZ
Yi Zhao
SL
Sheng-Biao Li
LY
Li-Xin You
LW
Lin-Wang Wang
YL
Yi Liu
WH
Wei Huang