Effect of polymer-insulating nanolayers on electron injection in polymer light-emitting diodes

Jong Hyeok Park, Michael J.; O Ok Park; Jae-Woong Yu; Jai Kyeong Kim; Young Chul Kim
March 2004
Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1783
Academic Journal
We report the effect of polymer-insulating nanolayers on electron injection in the polymer light-emitting diodes (PLEDs) in which a hole is the major charge carrier. Several different polymer nanolayers with varying dielectric constants were placed between the emitting layer and the aluminum cathode, and their influence on the device performance was investigated. The device with a nanolayer of lower dielectric constant demonstrated higher luminescence quantum efficiency. In particular, when a ∼10-nm-thick polystyrene layer was employed, the device gave approximately two orders of magnitude higher external quantum efficiency than that of the one without an insulating nanolayer. © 2004 American Institute of Physics.


Related Articles

  • Use of cross-linkable polyfluorene in the fabrication of multilayer polyfluorene-based light-emitting diodes with improved efficiency. Charas, A.; Alves, H.; Alcácer, L.; Morgado, J. // Applied Physics Letters;10/2/2006, Vol. 89 Issue 14, p143519 

    The authors report the use of a cross-linkable polyfluorene to fabricate multilayer light-emitting diodes (LEDs), thereby avoiding the restriction to combine polymeric solutions in different solvents. In particular, we find that for LEDs fabricated with a hole-injection layer of...

  • Light outcoupling efficiency of top-emitting organic light-emitting diodes. Smith, L. H.; Wasey, J. A. E.; Barnes, W. L. // Applied Physics Letters;4/19/2004, Vol. 84 Issue 16, p2986 

    We report results obtained from modeling the light outcoupling efficiency of top–emitting organic light-emitting diode (OLED) structures and compare them with results from conventional substrate-emitting structures. We investigate two types of emissive material, small molecule and...

  • High efficiency low operating voltage polymer light-emitting diodes with aluminum cathode. Deng, X.Y.; Lau, W.M.; Wong, K.Y.; Low, K.H.; Chow, H.F.; Cao, Y. // Applied Physics Letters;5/3/2004, Vol. 84 Issue 18, p3522 

    By blending poly(ethylene glycol) (PEG) into an electroluminescence (EL) polymer, significantly enhanced EL efficiency in a polymer light-emitting diode (PLED) with aluminum electrode was achieved. An orange-color-emitting PLED with 10 wt % PEG blending achieved device efficiencies exceeding 2.6...

  • Efficient multilayer white polymer light-emitting diodes with aluminum cathodes. Niu, Xiaodi; Qin, Chuanjiang; Zhang, Baohua; Yang, Junwei; Xie, Zhiyuan; Cheng, Yanxiang; Wang, Lixiang // Applied Physics Letters;5/14/2007, Vol. 90 Issue 20, p203513 

    Efficient multilayer white polymer light-emitting diodes (WPLEDs) with aluminum cathodes are fabricated. The multilayer structure is composed of a water soluble hole-injection layer, a toluene-soluble emissive layer, and an alcohol-soluble emissive layer. The polarity difference of the solvents...

  • Blue photo- and electroluminescence from poly(benzoyl-1,4-phenylene). Edwards, A.; Blumstengel, S. // Applied Physics Letters;1/20/1997, Vol. 70 Issue 3, p298 

    Evaluates the photoluminescent and electroluminescent properties of poly(benzoyl-1,4-phenylene) (PBP). Impact of the discovery of electroluminescence of poly(p-phenylene vinylene) on conjugated polymers; Application of conjugated polymers as active layers in light-emitting diodes (LED); Use of...

  • High-performance polymer light-emitting diodes fabricated with a polymer hole injection layer. Gong, X.; Moses, D.; Heeger, A. J.; Liu, S.; Jen, A. K.-Y. // Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p183 

    Enhanced luminance (L) and luminous efficiency (LE) of polymer light-emitting diodes (PLEDs) is demonstrated using poly(bis(tetraphenyldiamino)biphenyl-perfluorocyclobutane), poly(BTPD-Si-PFCB), as the hole injection layer. The monomer is cast directly onto the indium-tin-oxide anode and...

  • LIGHTING BASED ON ORGANIC LIGHT EMITTING DIODES. Amelung, Joerg; Eritt, Michael; Kirchhof, Christian // Light & Engineering;2011, Vol. 19 Issue 2, p42 

    The Organic Light Emitting Diode (OLED) technology is the first real area light source technology in history. It overcomes traditional restrictions by point source lighting technologies. OLED lighting is a very new technology on the market and design, technology and integration aspects influence...

  • Polymer Light-Emitting Diodes Efficiency Dependence on Bipolar Charge Traps Concentration. LuisMorgado; Alcácer, Luis; Morgado, Jorge // Advances in Materials Science & Engineering;2009, p1 

    The efficiency of light-emitting diodes (LEDs) based on poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-1,4-benzo-{2,1′-3}-thiadiazole)], F8BT, is optimized upon simultaneous doping with a hole and an electron trapping molecule, namely, N,N′-Bis(3-methylphenyl)- N,N′-diphenylbenzidine...

  • High efficiency organic light-emitting devices with Al/NaF cathode. Lee, J.; Park, Y.; Kim, D. Y.; Chu, H. Y.; Lee, H.; Do, L.-M. // Applied Physics Letters;1/13/2003, Vol. 82 Issue 2, p173 

    An organic light-emitting device (OLED) with an Al/NaF (1.5 nm) cathode exhibited a highly enhanced performance comparable to the one with the best Al/LiF cathode. This suggests that NaF can be an alternative to commonly used LiF interlayer for improved OLED performance. Photoelectron...


Read the Article


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

Try another library?
Sign out of this library

Other Topics