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Proceedings Paper

Organic light-emitting devices using phosphorescent dopants
Author(s): Takao Nagatomo; Susumu Nagashima; Ryosuke Sugawara
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Paper Abstract

The EL properties of organic light-emitting devices using phosphorescent dyes as a guest material are described. Poly(9-vinylcarbazole) (PVCz) in the polymer system and 4,4’-N,N’-dicarbazolbiphenyl (CBP) in the low molecular system are used as a matrix. Perylene, 4-dicyano-methylene-2-methyl-6-4-dimethylami-nostyryl-4H-piran (DCM1), bis (4-phenylimidazopyridine)beryllium (Be(PIP)2) and etc. are used as a fluorescent dopant and/or iridium-complexes: (tris-(2-phenyl-pyridine)iridium) (Ir(ppy)3), iridium(III)bis[(4,6-di-fluorophenyl) pyridinato-N,C2’] picolinate (FIrpic) and bis(2-(2’-benzo[4,5-a]thienyl)pyridinato-N,C3’)iridium(acetylacetonate) (btp2Ir(acac)) are used as a phosphorescent dopant. In the ITO/PVCz:DCM1, Be(PIP)2/Alq3/Al devices with DCM1(0.5mol%constant) and Be(PIP)2(variable), the peak wavelength does not change by the doping of Be(PIP)2 and the EL intensity becomes maximum at 0.5mol% doping and increases in comparison with the case with non-doped at 2 digits. These results indicate that Be (PIP)2 does not emit itself and roles to transfer the excited energy to the emitting centers (emitting assist). The EL properties of organic light-emitting diodes (OLEDs) using PVK as a matrix (host) and phosphorescent materials (btp2Ir(acac) and Ir(ppy)3) as a guest material are remarkably improved in comparison with OLEDs doped btp2Ir(acac) (guest) into PVK (host).

Paper Details

Date Published: 8 December 2004
PDF: 4 pages
Proc. SPIE 5774, Fifth International Conference on Thin Film Physics and Applications, (8 December 2004); doi: 10.1117/12.607382
Show Author Affiliations
Takao Nagatomo, Shibaura Institute of Technology (Japan)
Susumu Nagashima, Shibaura Institute of Technology (Japan)
Ryosuke Sugawara, Shibaura Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 5774:
Fifth International Conference on Thin Film Physics and Applications
Junhao Chu; Zongsheng Lai; Lianwei Wang; Shaohui Xu, Editor(s)

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