TITLE

High-efficiency and low-voltage p-i-n electrophosphorescent organic light-emitting diodes with double-emission layers

AUTHOR(S)
He, Gufeng; Pfeiffer, Martin; Leo, Karl; Hofmann, Michael; Birnstock, Jan; Pudzich, Robert; Salbeck, Josef
PUB. DATE
October 2004
SOURCE
Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3911
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate high-efficiency organic light-emitting diodes by incorporating a double-emission layer (D-EML) into p-i-n-type cell architecture. The D-EML is comprised of two layers with ambipolar transport characteristics, both doped with the green phosphorescent dye tris(phenylpyridine)iridium. The D-EML system of two bipolar layers leads to an expansion of the exciton generation region. Due to its self-balancing character, accumulation of charge carriers at the outer interfaces is avoided. Thus, a power efficiency of approximately 77 lm/W and an external quantum efficiency of 19.3% are achieved at 100 cd/m2 with an operating voltage of only 2.65 V. More importantly, the efficiency decays only weakly with increasing brightness, and a power efficiency of 50 lm/W is still obtained even at 4000 cd/m2.
ACCESSION #
14909786

 

Related Articles

  • Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer. Ikai, Masamichi; Tokito, Shizuo; Sakamoto, Youichi; Suzuki, Toshiyasu; Taga, Yasunori // Applied Physics Letters;7/9/2001, Vol. 79 Issue 2 

    One of the keys to highly efficient phosphorescent emission in organic light-emitting devices is to confine triplet excitons generated within the emitting layer. We employ “starburst” perfluorinated phenylenes (C[sub 60]F[sub 42]) as a both hole- and exciton-block layer, and a...

  • Determination of the energy levels of a phosphorescent guest in organic light emitting devices. Hill, I. G.; Ma¨kinen, A. J.; Kafafi, Z. H. // Applied Physics Letters;9/25/2000, Vol. 77 Issue 13 

    We have used photoelectron spectroscopy to study the relative binding energies of the highest occupied molecular orbitals (HOMOs) of the phosphorescent guest, 2, 3, 7, 8, 12, 13, 17, 18octaethyl-21H,23H-porphine platinum (PtOEP), and the organic electron transport host,...

  • High-efficiency electrophosphorescent organic light-emitting diodes with double light-emitting layers. Zhou, X.; Qin, D. S.; Pfeiffer, M.; Blochwitz-Nimoth, J.; Werner, A.; Drechsel, J.; Maennig, B.; Leo, K.; Bold, M.; Erk, P.; Hartmann, H. // Applied Physics Letters;11/18/2002, Vol. 81 Issue 21, p4070 

    We demonstrate high-efficiency electrophosphorescent organic light-emitting diodes (PHOLEDs) with double light-emitting layers (D–EMLs) by doping both hole and electron transport hosts with fac tris(2-phenylpyridine)iridium [Ir(ppy)[sub 3]] simultaneously. The D–EMLs PHOLEDs show...

  • An OLED Alternative.  // Lighting Design & Application;Apr2011, Vol. 41 Issue 4, p31 

    The article reports on the new organic light emitting diode (OLED) material developed by researcher Jinsang Kim and his colleagues which is a metal-free material and shines with phosphorescence.

  • High-efficiency organic electrophophorescent devices through balance of charge injection. Jabbour, G. E.; Wang, J.-F.; Peyghambarian, N. // Applied Physics Letters;3/18/2002, Vol. 80 Issue 11, p2026 

    Balancing the charge injection plays an important role not only in fluorescence-based organic light-emitting devices, but also in the performance of the recently introduced organic electrophosphorescent devices. By achieving a better balance in the injected charges, it is possible to fabricate...

  • Frequency domain instrument for measuring phosphorescence lifetime distributions in heterogeneous samples. Vinogradov, Sergei A.; Fernandez-Searra, Maria A.; Dugan, Benjamin W.; Wilson, David F. // Review of Scientific Instruments;Aug2001, Vol. 72 Issue 8 

    The luminescence lifetime distribution can be used to determine the distribution of quencher concentrations in a heterogeneous sample. We describe a frequency domain instrument for real-time measurements of phosphorescence lifetime distributions in microheterogeneous objects. In this system (1)...

  • Red electrophosphorescence from polymer doped with iridium complex. Gong, Xiong; Ostrowski, Jacek C.; Bazan, Guillermo C.; Moses, Daniel; Heeger, Alan J. // Applied Physics Letters;11/11/2002, Vol. 81 Issue 20, p3711 

    We demonstrate efficient, bright red electrophosphorescent light emitting diodes (LEDs) employing tris (2,5-bis-2'-(9',9'-dihexylfiuorene) pyridine) iridium (III), [Ir(HFP)3], doped into a blend of poly(vinylcarbazole) (PVK) with 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazol (PBD). At a current...

  • Electron and hole transport in a wide bandgap organic phosphine oxide for blue electrophosphorescence. Xiuyu Cai; Padmaperuma, Asanga B.; Sapochak, Linda S.; Vecchi, Paul A.; Burrows, Paul E. // Applied Physics Letters;2/25/2008, Vol. 92 Issue 8, p083308 

    We report blue phosphorescent organic light-emitting devices (OLEDs) using an ambipolar host, N-(4-diphenylphosphoryl phenyl) carbazole (MPO12), doped with iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic). The external quantum efficiency and operating voltage is...

  • Recycling of guided mode light emission in planar microcavity light emitting diodes. De Neve, H.; Blondelle, J. // Applied Physics Letters;2/17/1997, Vol. 70 Issue 7, p799 

    Examines the recycling of guided mode light emission in planar microcavity light emitting diodes (LED). Use of planar microcavities; Reasons for the high efficiency microcavity LED; Details on the quantum efficiency of a light emitting diode.

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