TITLE

Improvement of electron injection in inverted bottom-emission blue phosphorescent organic light emitting diodes using zinc oxide nanoparticles

AUTHOR(S)
Hyunkoo Lee; Insun Park; Jeonghun Kwak; Yoon, Do Y.; Changhee Lee
PUB. DATE
April 2010
SOURCE
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p153306
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We fabricated highly efficient iridium(III) bis[(4,6-di-fluorophenyl)-pyridinato-N,C2′] picolinate doped inverted bottom-emission blue phosphorescent organic light-emitting diodes, with an electron injection layer of zinc oxide (ZnO) nanoparticles (NPs). The ZnO NPs layer lowers the turn-on voltage by about 4 V and significantly enhances the efficiency. The device with ZnO NPs shows peak efficiencies of 16.5 cd/A and 8.2%, about three times higher than those of the device without ZnO NPs. Since the ZnO NPs layer has a wide band gap, good electron transporting properties and low work function, it can be utilized as an effective electron injection layer with good transparency.
ACCESSION #
49193270

 

Related Articles

  • Highly efficient inverted top emitting organic light emitting diodes using a transparent top electrode with color stability on viewing angle. Jung-Bum Kim; Jeong-Hwan Lee; Chang-Ki Moon; Jang-Joo Kim // Applied Physics Letters;2/17/2014, Vol. 104 Issue 7, p073301-1 

    We report a highly efficient phosphorescent green inverted top emitting organic light emitting diode with excellent color stability by using the 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile/indium zinc oxide top electrode and bis(2-phenylpyridine)iridium(III) acetylacetonate as the emitter...

  • Study of the size effect on the optical mode frequencies of ZnO nanoparticles with nearly uniform size. Zhang, S. L.; Zhang, Y.; Fu, Z.; Wu, S. N.; Gao, M.; Liu, M.; Chen, J.; Niu, L.; Jiang, J. Z.; Ling, Y.; Wang, Q.; Chen, H. // Applied Physics Letters;12/11/2006, Vol. 89 Issue 24, p243108 

    It was found in ZnO nanoparticles of nearly uniform size that the Raman frequencies of both the polar A1(LO) and nonpolar E2(H) modes do not shift with particle sizes. This observation is in perfect agreement with previous theoretical prediction. The observed result is consistent with the...

  • Localized surface plasmon-enhanced electroluminescence from ZnO-based heterojunction light-emitting diodes. Zhang, S. G.; Zhang, X. W.; Yin, Z. G.; Wang, J. X.; Dong, J. J.; Gao, H. L.; Si, F. T.; Sun, S. S.; Tao, Y. // Applied Physics Letters;10/31/2011, Vol. 99 Issue 18, p181116 

    We demonstrate the surface plasmon (SP) enhanced n-ZnO/AlN/p-GaN light-emitting diodes (LEDs) by inserting the Ag nanoparticles (NPs) between the ZnO and AlN layers. The ultraviolet/violet near band edge emission of the device is significantly enhanced while the green defect-related emission is...

  • Highly efficient single-layer dendrimer light-emitting diodes with balanced charge transport. Anthopoulos, Thomas D.; Markham, Jonathan P. J.; Namdas, Ebinazar B.; Samuel, Ifor D. W.; Lo, Shih-Chun; Burn, Paul L. // Applied Physics Letters;6/30/2003, Vol. 82 Issue 26, p4824 

    High-efficiency single-layer-solution-processed green light-emitting diodes based on a phosphorescent dendrimer are demonstrated. A peak external quantum efficiency of 10.4% (35 cd/A) was measured for a first generation fac-tris(2-phenylpyridine) iridium cored dendrimer when blended with...

  • Phosphorescent organic light-emitting device with an ambipolar oxadiazole host. Lee, Jiun-Haw; Tsai, Hsin-Hung; Leung, Man-Kit; Yang, Chih-Chiang; Chao, Chun-Chieh // Applied Physics Letters;6/11/2007, Vol. 90 Issue 24, p243501 

    In this latter, the authors demonstrated a phosphorescent organic light-emitting device (OLED) with a lower driving voltage and a longer operation lifetime based on 2,2′-bis[5-phenyl-2-(1,3,4)oxadazolyl]biphenyl, an oxadiazole (OXD) derivative, as the host of the emitting layer doped with...

  • Influence of doping profile on the efficiency of blue phosphorescent organic light-emitting diodes. Lee, Jonghee; Lee, Jeong-Ik; Song, Ki-Im; Lee, Su Jin; Chu, Hye Yong // Applied Physics Letters;3/31/2008, Vol. 92 Issue 13, p133304 

    We demonstrate that electroluminescent efficiency of blue phosphorescent organic light-emitting diodes could be improved by changing doping profile in the emissive layer (EML) of the device containing iridium(III)bis(4,6-difluorophenyl)-pyridinato-N,C2′) picolinate (FIrpic) and...

  • Effects of triplet energies and transporting properties of carrier transporting materials on blue phosphorescent organic light emitting devices. Jaewon Lee; Neetu Chopra; Sang-Hyun Eom; Ying Zheng; Jiangeng Xue; Franky So; Jianmin Shi // Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123306 

    We have studied the effects of the hole transporting layers and electron transporting layers on the device efficiencies of iridium(III) bis[(4,6-di-fluorophenyl)-pyridinato-N,C2′] picolinate (FIrpic) doped 3,5′-N,N′-dicarbazole-benzene (mCP) host blue phosphorescent organic...

  • Simple color tuning of phosphorescent dendrimer light emitting diodes. Namdas, Ebinazar B.; Anthopoulos, Thomas D.; Samuel, Ifor D. W.; Frampton, Michael J.; Shih-Chun Lo; Burn, Paul L. // Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p161104 

    A simple way of tuning the emission color in solution processed phosphorescent organic light emitting diodes is demonstrated. For each color a single emissive spin-coated layer consisting of a blend of three materials, a fac-tris(2-phenylpyridyl)iridium (III) cored dendrimer (Ir–G1) as...

  • Dislocations of ZnO single crystals examined by X-ray topography and photoluminescence. Yoshino, K.; Yoneta, M.; Yonenaga, I. // Journal of Materials Science: Materials in Electronics;Feb2008, Vol. 19 Issue 2, p199 

    Dislocations generated by indentation and subsequent annealing at elevated temperatures up to 800 �C in high quality (0001) wafers of ZnO single crystals were investigated by transmission X-ray topography and photoluminescence. Damages induced by indentation in ZnO wafers were guessed to...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics