Photoelectron spectroscopy of hybrid interfaces for light emitting diodes: Influence of the substrate work function

Greczynski, G.; Salaneck, W. R.
November 2001
Applied Physics Letters;11/5/2001, Vol. 79 Issue 19, p3185
Academic Journal
Photoelectron spectroscopy results of studies of a conjugated polymer poly(9, 9-dioctylfluorene) thin films embedded between two contacts with different work functions are reported in this work. It is demonstrated that, depending on the work function of contact material involved, the binding energy of the C(1s) core level of the polymer, changes according to the resulting built-in potential in the polymer layer. The deposition of the same metal onto a polymer surface can lead to binding energy shifts of the core-level spectra in either direction, determined by the work function of the underlying substrate. © 2001 American Institute of Physics.


Related Articles

  • 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...

  • 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...

  • Efficient bottom cathodes for organic light-emitting devices. Jie Liu; Duggal, Anil R.; Shiang, Joseph J.; Heller, Christian M. // Applied Physics Letters;8/2/2004, Vol. 85 Issue 5, p837 

    Bilayers of aluminum and an alkali fluoride are well-known top cathode contacts for organic light-emitting devices but have never been successfully applied as bottom contacts. We describe a bilayer bottom cathode contact for organic electronic devices based on reversing the well-known top...

  • Degradation studies on high-voltage-driven organic light-emitting device using in situ on-operation method with scanning photoelectron microscopy. Lee, J.; Sohn, S.; Yun, H. J.; Shin, H. J. // Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p133310 

    We investigated the degradation behavior of a high-voltage-driven organic light-emitting device (OLED) by operating the device in an ultrahigh-vacuum environment. In situ on-operation method provided the initial degradation process when the OLED was biased inside an analysis chamber. The...

  • 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...

  • Li2CO3 as an n-type dopant on Alq3-based organic light emitting devices. Po-Ching Kao; Jie-Han Lin; Jing-Yuan Wang; Cheng-Hsien Yang; Sy-Hann Chen // Journal of Applied Physics;May2011, Vol. 109 Issue 9, p094505 

    Lithium carbonate (Li2CO3) is used as an n-type dopant to improve the electro-optical properties of the Alq3-based organic light-emitting diodes (OLEDs). Li2CO3-doped tris(8-hydroxyquinolinato) aluminum (Alq3) layers with various concentrations were prepared by the co-evaporating method. When...

  • Band bending of LiF/Alq[sub 3] interface in organic light-emitting diodes. Kyuwook Ihm, Hideki; Tai-Hee Kang; Ki-Jeong Kim; Chan-Cuk Hwang, Hideki; Yong-Jun Park, Hideki; Ki-Bong Lee; Bongso Kim, Hideki; Cheol-Ho Jeon, Hideki; Chong-Yun Park, Hideki; Kibeom Kim, Hideki; Yoon-Heung Tak, Hideki // Applied Physics Letters;10/6/2003, Vol. 83 Issue 14, p2949 

    The insertion of LiF for an interlayer material between the Al cathode and tris-(8-hydroxyquinoline) aluminum (Alq[sub 3]) in the organic light-emitting diodes (OLEDs) provides an improved device performance. The highly occupied molecular orbital (HOMO) level lowering in the Alq[sub 3] layer...

  • 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...

  • Photoemission spectroscopic investigation on the interface formation of a ladder-type poly(para-phenylene) with aluminum. Koch, N.; Pairleitner, R.; Le, Q. Toan; Toan Le, Q.; Forsythe, E. W.; Forsythe, E.W.; Gao, Y.; Leising, G. // Applied Physics Letters;6/19/2000, Vol. 76 Issue 25 

    The formation of the interface between a thin film of a ladder-type poly(para-phenylene) m-LPPP and aluminum was investigated with x-ray and ultraviolet photoemission spectroscopy. The physical properties of this interface are of actual interest as m-LPPP is successfully applied as active...


Read the Article


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

Try another library?
Sign out of this library

Other Topics