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.
May 2004
Applied Physics Letters;5/3/2004, Vol. 84 Issue 18, p3522
Academic Journal
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 cd/A for a wide range of bias voltage, which is more than two orders of magnitude higher than that of a similar PLED without the PEG blending. The enhanced efficiency was a result of the reduction of electron injection barrier height at the cathode–polymer interface. It is believed that interfacial interaction that is specific to Al plays an important role in the enhancement mechanism. © 2004 American Institute of Physics.


Related Articles

  • 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...

  • 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...

  • Modeling of organic light-emitting diodes with graded concentration in the emissive multilayer. Gusso, A.; Ma, Dongge; Hümmlegen, I. A.; da Luz, M. G. E. // Journal of Applied Physics;2/15/2004, Vol. 95 Issue 4, p2056 

    We model the electrical behavior of organic light-emitting diodes whose emissive multilayer is formed by blends of an electron transporting material, tris-(8-hydroxyquinoline) aluminum (Alq[sub 3]) and a hole transporting material, N,N[sup ′]-diphenyl-N,N[sup ′]-bis(1,1[sup...

  • Influence of electron transport layer thickness on optical properties of organic light-emitting diodes. Guohong Liu; Yong Liu; Baojun Li; Xiang Zhou // Journal of Applied Physics;6/7/2015, Vol. 117 Issue 21, p214505-1 

    We investigate experimentally and theoretically the influence of electron transport layer (ETL) thickness on properties of typical N,N'-diphenyl-N,N'-bis(1-naphthyl)-[1,1'-biphthyl]-4,4'-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (Alq3) heterojunction based organic light-emitting diodes...

  • Efficiency enhancement of an organic light-emitting diode with a cathode forming two-dimensional periodic hole array. Liu, C.; Kamaev, V.; Vardeny, Z. V. // Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p143501 

    We fabricated an organic light-emitting diode using a π-conjugated polymer emissive layer sandwiched between two semitransparent electrodes: an optically thin gold film anode, whereas the cathode was in the form of an optically thick aluminum (Al) film with patterned periodic subwavelength...

  • 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 // Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1783 

    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...

  • Hybrid light-emitting polymer device fabricated on a metallic nanowire array. Strevens, A. E.; Drury, A.; Lipson, S. M.; Kröll, M.; Blau, W. J.; Hörhold, H. H. // Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p143503 

    An electrode comprised of a copper nanowire array, fabricated by electrodeposition into a porous alumina membrane, is incorporated into a single-layer organic light-emitting device. The 48-nm-diameter copper nanowires form an array of electrical nanocontacts. Current–voltage and...

  • Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene–vinylene). Cacialli, F.; Friend, R. H.; Haylett, N.; Daik, R.; Feast, W. J.; dos Santos, D. A.; Bre´das, J. L. // Applied Physics Letters;12/16/1996, Vol. 69 Issue 25, p3794 

    We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylene vinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene) or briefly PDPV, to fabricate triple-layer light-emitting diodes PPV/PVK/PDPV/metal, with indium tin oxide as the...

  • Fabrication of polymer light-emitting diodes using doped silicon electrodes. Parker, I.D.; Kim, Helen H. // Applied Physics Letters;4/4/1994, Vol. 64 Issue 14, p1774 

    Examines the fabrication of light-emitting diodes (LED) from semiconducting conjugated polymer. Use of doped silicon substrates as an electrode material; Possibility of the procedure to integrate LED into silicon based integrated circuitry; Demonstration of low-voltage light emission from...


Read the Article


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

Try another library?
Sign out of this library

Other Topics