Communication
ChemComm
Table 2 Device performances of the green devices
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3 S. O. Jeon, S. E. Jang, H. S. Son and J. Y. Lee, Adv. Mater., 2011,
23, 1436.
Max.
QE (%) at
1000 nit
Max PE
Color index at
1000 nit
Material
Q.E. (%)
(lm Wꢀ1
)
4 S. O. Jeon, K. S. Yook, C. W. Joo and J. Y. Lee, Adv. Mater., 2010,
22, 1872.
5 S. J. Lee, J. S. Park, K.-J. Yoon, Y.-I. Kim, S.-H. Jin, S. K. Kang, Y.-S.
Gal, S. Kang, J. Y. Lee, J.-W. Kang, S.-H. Lee, H.-D. Park and J.-J. Kim,
Adv. Funct. Mater., 2008, 18, 3922.
6 N. Chopra, J. Lee, Y. Zheng, S.-H. Eom, J. Xue and F. So, ACS Appl.
Mater. Interfaces, 2009, 1, 1169.
7 Y. J. Cho, K. S. Yook and J. Y. Lee, Adv. Mater., 2014, 26, 4050.
8 E. L. Williams, K. Haavisto, J. Li and G. E. Jabbour, Adv. Mater., 2007,
19, 197.
9 M.-F. Wu, S.-J. Yeh, C.-T. Chen, H. Murayama, T. Tsuboi, W.-S. Li,
I. Chao, S.-W. Liu and J.-K. Wang, Adv. Funct. Mater., 2007, 17, 1887.
10 H.-H. Chou and C.-H. Cheng, Adv. Mater., 2010, 22, 2468.
11 Y. Tao, Q. Wang, C. Yang, Q. Wang, Z. Zhang, T. Zou, J. Qin and
D. Ma, Angew. Chem., Int. Ed., 2008, 47, 8104.
12 C. Tang, R. Bi, Y. Tao, F. Wang, X. Cao, S. Wang, T. Jiang, C. Zhong,
H. Zhang and W. Huang, Chem. Commun., 2015, 51, 1650.
13 J. Bin, N. Cho and J. Hong, Adv. Mater., 2012, 24, 2911.
14 H. Sasabe, N. Toyota, H. Nakanishi, T. Ishizaka, Y.-J. Pu and J. Kido,
Adv. Mater., 2012, 24, 3212.
1-PCz-1-TCza
2-PCz-1-TCza
3-PCz-1-TCza
4-PCz-1-TCza
2-PCz-1-TCzb
20.9
24.5
19.7
20.6
22.4
18.1
23.8
16.8
19.6
19.9
53.4
62.9
68.6
77.2
103.7
0.29, 0.62
0.29, 0.62
0.30, 0.62
0.30, 0.62
0.32, 0.63
a
b
mCP hole transport layer. TCTA/mCP hole transport layer.
respectively. Device performances are summarized in Fig. S5
(ESI†) and Table 2.
In conclusion, four host materials derived from bicarbazole
were synthesized by coupling the 1-position modified carbazole
with the 1-, 2-, 3-, 4-modified carbazole. High quantum efficiency
above 20% could be achieved using the host materials and
2-PCz-1-TCz showed the highest quantum efficiency of 24.5%
in the green phosphorescent OLEDs. Additionally, optimization
of the device structure could provide a high power efficiency of
104 lm Wꢀ1 in the 2-PCz-1-TCz device.
15 C.-H. Chang, M.-C. Kuo, W.-C. Lin, Y.-T. Chen, K.-T. Wong, S.-H.
Chou, E. Mondal, R. C. Kwong, S. Xia, T. Nakagawa and C. Adachi,
J. Mater. Chem., 2012, 22, 3832.
This work was supported by high efficiency and long lifetime
in green phosphorescent organic light-emitting diodes using
host and hole transport materials funded by MOTIE.
ˇ
16 T. Serevicius, T. Nakagawa, M.-C. Kuo, S.-H. Cheng, K.-T. Wong,
C.-H. Chang, R. C. Kwong, S. Xia and C. Adachi, Phys. Chem. Chem.
Phys., 2013, 15, 15850.
17 J.-Y. Shen, X.-L. Yang, T.-H. Huang, J. T. Lin, T.-H. Ke, L.-Y. Chen,
C.-C. Wu and M.-C. P. Yeh, Adv. Funct. Mater., 2007, 17, 983.
18 W. Jiang, L. Duan, J. Qiao, G. Dong, D. Zhang, L. Wang and Y. Qiu,
J. Mater. Chem., 2011, 21, 4918.
Notes and references
1 R. J. Holmes, S. R. Forrest, Y. J. Tung, R. C. Kwong, J. J. Brown, 19 M. Kim and J. Y. Lee, Org. Electron., 2013, 14, 67.
S. Garon and M. E. Thompson, Appl. Phys. Lett., 2003, 82, 2422.
20 M. Kim and J. Y. Lee, Adv. Funct. Mater., 2014, 24, 4164.
Chem. Commun.
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