| Original Articles |
|
|
|
|
Efficient Solution-Processed Blue Electrophosphorescent Devices Based on a Novel Small-Molecule Host |
| HOU Liu-Dong;LI Wei;DUAN Lian;QIU Yong |
| Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084 |
|
| Cite this article: |
|
HOU Liu-Dong, LI Wei, DUAN Lian et al 2008 Chin. Phys. Lett. 25 1457-1460 |
|
|
|
Abstract Efficient blue small molecular phosphorescent light-emitting diodes with a blue phosphorescent dyebis(3,5-difluoro-2-(2-pyridyl)-phenyl-(2-carboxypride) iridium (III) (FIrpic) doped into a novel small-molecule host 9,9-bis[4-(3,6-di-tert-butylcarbazol-9-yl)phenyl] fluorene (TBCPF) as the light-emitting layer have been fabricated by spin-coating. The host TBCPF can form homogeneous amorphous films by spin-coating and has triplet energy higher than that of the blue phosphorescent dye FIrpic. All the devices with different FIrpic concentration in the emitting layer give emission from FIrpic indicating complete energy transfer from TBCPF to FIrpic. The device shows the best performance with a peak brightness of 8050cd/m2 at 10.2V and the maximum current efficiency up to 3.52cd/A, when the FIrpic doped concentration is as
high as 16%.
|
| Keywords:
78.60.Fi
78.66.Qn
85.60.Jb
81.15.-z
|
|
|
Received: 24 December 2007
Published: 31 March 2008
|
|
| PACS: |
78.60.Fi
|
(Electroluminescence)
|
| |
78.66.Qn
|
(Polymers; organic compounds)
|
| |
85.60.Jb
|
(Light-emitting devices)
|
| |
81.15.-z
|
(Methods of deposition of films and coatings; film growth and epitaxy)
|
|
|
|
|
|
[1] Tang C W and VanSlyke S A 1987 Appl. Phys. Lett. 51 913
[2] Baldo M A et al 1998 Nature 395 151
[3] Burroughes J H, et al. 1990 Nature 347 539.
[4] Elschner A et al 2001 Adv. Mater. 13 1811
[5] Cheng J A, Chen C H and Liao C H 2004 Chem. Mater. 162862
[6] Qiao J et al 2005 Chem. Commun. 4560
[7] Gong X et al 2006 J. Phys. Chem. B 110 7344
[8] Hino Y, Kajii H and Ohmori Y 2004 Org. Electron. 5 265
[9] Jou J H et al 2005 Appl. Phys. Lett. 87 043508
[10] Ooe M et al 2006 Jpn. J. Appl. Phys. 45 250
[11] Li W et al 2007 Tetrahedron 63 10161
[12] Yang X H et al 2006 Appl. Phys. Lett. 88 021107 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
