TITLE

Efficient electrophosphorescent polymer light-emitting devices using a Cs/Al cathode

AUTHOR(S)
Nakamura, A.; Tada, T.; Mizukami, M.; Yagyu, S.
PUB. DATE
January 2004
SOURCE
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p130
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Efficient electrophosphorescent polymer light-emitting devices have been developed using a Cs/Al cathode. The materials used were a molecularly doped poly(9-vinylcarbazole)-emissive layer with electrophosphorescent complexes: bis[2-(2[sup ′]-benzothienyl)-pyridinato-N,C[sup 3[sup ′]]](acetylacetonate)Ir(III) as a red emitter, fac-tris(2-phenylpyridyl)Ir(III) as a green emitter, and bis[(4,6-difluorophenyl)-pyridinato-N,C[sup 2]](picolinato)Ir(III) as a blue emitter. The red, green, and blue electrophosphorescent emitting devices exhibited efficient emissions of 4, 31, and 14 cd/A, respectively. An inspection of secondary ion mass spectroscopy (SIMS) profiles confirmed that Cs diffuses into both Al and the emissive layer. Also, a Cs concentration of approximately 1 atomic% was estimated to be present at the interface from x-ray photoelectron spectroscopy (XPS) profiles. © 2004 American Institute of Physics.
ACCESSION #
11805656

 

Related Articles

  • Red electrophosphorescent top emission organic light-emitting device with Ca/Ag semitransparent cathode. Lee, C. J.; Pode, R. B.; Han, J. I.; Moon, D. G. // Applied Physics Letters;12/18/2006, Vol. 89 Issue 25, p253508 

    Using a Ca (10 nm)/Ag (10 nm) semitransparent cathode and efficient electron transport and/or buffer layer, red electrophosphorescent top emission organic light-emitting device has been fabricated. A low turn-on voltage of 4.6 V and clean electrophosphorence peaks at 616 and 674 nm are reported....

  • A study of poly(p-phenylenevinylene) and its derivatives using x-ray photoelectron spectroscopy. Lee, H.G.; Kim, S.; Hwang, C.; Choong, V.; Park, Y.; Gao, Y.; Hsieh, B. R. // Journal of Applied Physics;11/15/1997, Vol. 82 Issue 10, p4962 

    Studies the poly(p-phenylenevinylene) and its derivatives (DP-PPV and labeled R-7) using x-ray photoelectron spectroscopy. Photoemission studies on the effect of metal overlayers which are the electrodes for light emitting diodes; Various side group substitutions for the polymers to enhance...

  • Highly efficient polymer light-emitting devices using a phosphorescent sensitizer. He, Gufeng; Chang, Shun-Chi; Chen, Fang-Chung; Li, Yongfang; Yang, Yang // Applied Physics Letters;8/19/2002, Vol. 81 Issue 8, p1509 

    Highly efficient single-layer polymer light-emitting diodes that employ Nile Red as a fluorescent dye, with a green phosphorescent-sensitizer, bis(2-phenyl pyridinato-N,C[sup 2]′) iridium (acetylacetonate) doped in a PVK/PBD host are demonstrated. The function of the phosphorescent...

  • Enhancement of hole injection using ozone treated Ag nanodots dispersed on indium tin oxide anode for organic light emitting diodes. Moon, Jong-Min; Bae, Jung-Hyeok; Jeong, Jin-A; Jeong, Soon-Wook; Park, No-Jin; Kim, Han-Ki; Kang, Jae-Wook; Kim, Jang-Joo; Yi, Min-Su // Applied Physics Letters;4/16/2007, Vol. 90 Issue 16, p163516 

    The authors report the enhancement of hole injection using an indium tin oxide (ITO) anode covered with ultraviolet (UV) ozone-treated Ag nanodots for fac tris (2-phenylpyridine) iridium Ir(ppy)3-doped phosphorescent organic light-emitting diodes (OLEDs). X-ray photoelectron spectroscopy and...

  • Efficient electron injection in organic light-emitting diodes using lithium quinolate/Ca/Al cathodes. Kim, Sung Hyun; Jang, Jyongsik; Lee, Jun Yeob // Applied Physics Letters;9/3/2007, Vol. 91 Issue 10, p103501 

    Device performances of green devices with cathode structure of lithium quinolate (Liq)/Ca/Al were investigated and electron injection mechanism was studied using ultraviolet photoelectron spectroscopy. Power efficiency could be improved by 70% by using Liq/Ca/Al cathode structure due to...

  • Triplet exciton confinement in phosphorescent polymer light-emitting diodes. Chen, Fang-Chung; He, Gufeng; Yang, Yang // Applied Physics Letters;2/17/2003, Vol. 82 Issue 7, p1006 

    A series of iridium complexes, with triplet energy levels above or below the triplet level of host polymer, were used to study the flow of excitons between the host and the dopants. The performance of phosphorescent polymer light-emitting diodes has been shown to be sensitive to the triplet...

  • Light-emitting polymer space-charge-limited transistor. Chen, Chun-Yu; Chao, Yu-Chiang; Meng, Hsin-Fei; Horng, Sheng-Fu // Applied Physics Letters;12/1/2008, Vol. 93 Issue 22, p223301 

    Polymer light-emitting transistor is realized by vertically stacking a top-emitting polymer light-emitting diode on a polymer space-charge-limited transistor. The transistor modulates the current flow of the light-emitting diode by the metal-grid base voltage. The active semiconductor of the...

  • Improved electron injection in polymer light-emitting diodes using anionic conjugated polyelectrolyte. Youngeup Jin; Bazan, Guillermo C.; Heeger, Alan J.; Jin Young Kim; Kwanghee Lee // Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123304 

    We report improved performance in polymer light-emitting diodes incorporating conjugated polyelectrolytes as an electron injection layer (EIL). When we introduce water soluble conjugated polymers, poly[9,9′-bis(4-sulfonatobutyl)fluorene-co-alt-1,4-phenylene] (anionic PFP), between the...

  • Modification of the hole injection barrier in organic light-emitting devices studied by ultraviolet photoelectron spectroscopy. Ding, X. M.; Ding, X.M.; Hung, L. M.; Hung, L.M.; Cheng, L. F.; Cheng, L.F.; Deng, Z. B.; Deng, Z.B.; Hou, X. Y.; Hou, X.Y.; Lee, C. S.; Lee, C.S.; Lee, S. T.; Lee, S.T. // Applied Physics Letters;5/8/2000, Vol. 76 Issue 19 

    Ultraviolet photoelectron spectroscopy has been applied to the investigation of modified hole injection barriers in organic light-emitting devices (OLEDs). Different from those reported previously, the indium tin oxide (ITO) surface treated in situ by oxygen plasma possesses a work function of...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics