Lithium–fluoride-modified indium tin oxide anode for enhanced carrier injection in phenyl-substituted polymer electroluminescent devices

Zhu, Furong; Low, Beeling; Zhang, Keran; Chua, Soojin
August 2001
Applied Physics Letters;8/20/2001, Vol. 79 Issue 8, p1205
Academic Journal
Phenyl-substituted polymer electroluminescent (EL) devices using an insulating lithium–fluoride (LiF) layer between indium tin oxide (ITO) and poly(styrene sulfonate)-doped poly(3,4-ethylene dioxythiophene) (PEDOT) hole transporting layer have been fabricated. By comparing the devices made without this layer, the results demonstrate that the former has a higher EL brightness operated at the same current density. At a given constant current density of 20 mA/cm[sup 2], the luminance and efficiency for devices with 1.5 nm LiF-coated ITO were 1600 cd/m[sup 2] and 7 cd/A. These values were 1170 cd/m[sup 2] and 5.7 cd/A, respectively, for the same devices made with only an ITO anode. The ultrathin LiF layer between ITO and PEDOT modifies the hole injection properties. A more balanced charge carrier injection due to the anode modification by an ultrathin LiF layer is used to explain this enhancement. © 2001 American Institute of Physics.


Related Articles

  • Polyaniline and poly (N-vinylcarbazole) blends as anode for blue light-emitting diodes. Jinkoo Chung; Beomrak Choi // Applied Physics Letters;6/14/1999, Vol. 74 Issue 24, p3645 

    Reports on the successful introduction of a polyaniline (PANI) anode that is blend with poly(N-vinylcarbazole) or PVK for organic light-emitting diodes (OLED). Comparison with the usual PANI network electrodes; Simpler fabrication; Better planarized surface; Vapor-deposited emitting layer.

  • Improved operational stability of polyfluorene-based organic light-emitting diodes with... Kim, J. S.; Friend, R. H. // Applied Physics Letters;5/24/1999, Vol. 74 Issue 21, p3084 

    Studies the influence of various surface treatments of indium-tin-oxide anodes on the operational stability of high efficiency green-emitting polymer light emitting diodes. Anode modification by physical, chemical and combined treatments; Effects of oxygen plasma on the stability under constant...

  • Enhanced hole injections in organic light-emitting devices by depositing nickel oxide on indium tin oxide anode. Chan, I-Min; Hsu, Tsung-Yi; Hong, Franklin C. // Applied Physics Letters;9/2/2002, Vol. 81 Issue 10, p1899 

    An ultrathin layer of nickel oxide (NiO) was deposited on the indium tin oxide (ITO) anode to enhance the hole injections in organic light-emitting diode (OLED) devices. A very low turn-on voltage (3 V) was actually observed for the device with NiO on ITO. The enhancement of hole injections by...

  • Anode modification in organic light-emitting diodes by low-frequency plasma polymerization of CHF[sub 3]. Hung, L. S.; Zheng, L. R.; Mason, M. G. // Applied Physics Letters;1/29/2001, Vol. 78 Issue 5, p673 

    Plasma polymerization of CHF[sub 3] at low frequencies was utilized for anode modification in organic light-emitting diodes. The polymerized fluorocarbon films have a high ionization potential and a relatively low resistivity. The devices with a polymer-coated anode of indium-tin-oxide exhibited...

  • High-efficiency top-emitting organic light-emitting devices. Lu, M.-H.; Weaver, M. S.; Zhou, T. X.; Rothman, M.; Kwong, R. C.; Hack, M.; Brown, J. J. // Applied Physics Letters;11/18/2002, Vol. 81 Issue 21, p3921 

    Based on theoretical arguments that top-emitting organic light-emitting devices (TOLEDs) can be more efficient than equivalent bottom-emitting devices, we fabricated TOLEDs comprising reflective anodes and transparent compound cathodes that emit 20.8% more photons in the forward 120° cone...

  • Inverted hybrid organic light-emitting device with polyethylene dioxythiophene-polystyrene sulfonate as an anode buffer layer. Dobbertin, T.; Werner, O.; Meyer, J.; Kammoun, A.; Schneider, D.; Riedl, T.; Becker, E.; Johannes, H.-H.; Kowalsky, W. // Applied Physics Letters;12/15/2003, Vol. 83 Issue 24, p5071 

    In this study we demonstrate inverted organic light-emitting diodes (OLEDs) utilizing highly conductive polyethylene dioxythiophene–polystyrene sulfonate as a buffer layer to a radio-frequency sputter-deposited indium–tin–oxide as the anode. In comparison to an entirely...

  • Molecular organic light-emitting diodes using highly conducting polymers as anodes. Kim, W. H.; Ma¨kinen, A. J.; Nikolov, N.; Shashidhar, R.; Kim, H.; Kafafi, Z. H. // Applied Physics Letters;5/20/2002, Vol. 80 Issue 20, p3844 

    Films fabricated from commercially available poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) aqueous dispersions have been widely used in many electronic and optoelectronic applications. Previous attempts to utilize them as anodes in organic light-emitting diodes (OLEDs) were...

  • OLEDs - Lighting's New Wave. Eley, Laura // Canadian Consulting Engineer;Aug/Sep2015, Vol. 56 Issue 5, p51 

    The article offers information on the lighting technology organic light-emitting diodes (OLEDs) which could transform the lighting of spaces, with their flexible, thin surfaces that can be wrapped around different forms. Topics include OLED consisting of an OLED-stack layers of organic materials...

  • Metal diffusion from electrodes in organic light-emitting diodes. Lee, S.T.; Gao, Z.Q.; Hung, L.S. // Applied Physics Letters;9/6/1999, Vol. 75 Issue 10, p1404 

    Studies metal diffusion from magnesium-silver cathodes and indium-tin-oxide anodes in organic light-emitting diodes. Absence of magnesium diffusion under device operation; Effect on luminance decay with operation time.


Read the Article


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

Try another library?
Sign out of this library

Other Topics