Low roll-off efficiency green phosphorescent organic light-emitting devices with simple double emissive layer structure

Woo Sik jeon; Tae Jin Park; Sun Young Kim; Pode, Ramchandra; Jin Jang; Jang Hyuk Kwon
August 2008
Applied Physics Letters;8/11/2008, Vol. 93 Issue 6, p063303
Academic Journal
Using an Ir(ppy)3 metal complex doped in 4,4′4″-tris(N-carbazolyl)-triphenylamine hole and bis[2-(2-hydroxyphenyl)-pyridine]beryllium electron transport host materials, simple three layer green phosphorescent organic light-emitting devices comprising double emissive layers have been fabricated. A low driving voltage value of 3.3 V to reach a luminance of 1000 cd/m2 and maximum current- and power-efficiency values of 58.7 cd/A and 65.1 lm/W, and maximum external quantum efficiency (EQE) value of 18.6% are reported in this device. EQE exceeding 15% over a wide range of current density from 0.03 to 25 mA/cm2 is noticed. We demonstrate a low roll-off current efficiency value of 12% at a luminance of 10 000 cd/m2 in a highly efficient simple double emissive layer device, imperative to high brightness applications.


Related Articles

  • Synthesis and Photophysical Properties of a Series of Biscyclometalated Platinum(II) Complexes on the Basis of a Tridentate 2,6-Diphenylpyridine. Kulikova, M. V.; Balashev, K. P.; Erzin, Kh. // Russian Journal of General Chemistry;Dec2003, Vol. 73 Issue 12, p1839 

    The complexes C,C-trans-[Pt(C^N^C)L]z [C^N^C is bisdeprotonated 2,6-diphenylpyridinate (dppy2-); L = CO, Me2SO (dmso), ethylenediamine (en), CN-, pyrazine (pz), P(C6F5)3, 4,4'-bipyridine (4,4'-bpy)] were synthesized and characterized by 1H NMR, electronic, and emission spectroscopy....

  • Synthesis, Structures, and Properties of Four Novel HgII Complexes Based on Pyridine Acylamide Ligands. Zhang, Xiao-Min; Feng, Xue-Feng; Li, Jian-Qiang; Luo, Feng // Australian Journal of Chemistry;2015, Vol. 68 Issue 1, p80 

    In this work we synthesised four new pyridine acylamide complexes [HgI2(L1)] (1) and (2), [HgI2(L2)2] (3), and [HgI2(L3)]n (4) (L1 = N,N'-bis(3-pyridylmethyl)benzene-1,4-dicarboxamide, L2 = N4N4'-bis(pyridin-3-yl)-[1,1'-biphenyl]-4,4'-dicarboxamide, L3 =...

  • Hybrid spacer for high-efficiency white organic light-emitting diodes. Ji Hoon Seo; Il Houng Park; Gu Young Kim; Kum Hee Lee; Min Kyu Kim; Seung Soo Yoon; Young Kwan Kim // Applied Physics Letters;5/5/2008, Vol. 92 Issue 18, p183303 

    High-efficient white organic light-emitting diodes (WOLEDs) were fabricated by using the following three different emitting materials: 4″-(2,2-diphenylvinyl)-1-[4-(N,N-diphenylamino)-styryl]-terphenyl for blue emission, fac-tris(2-phenypyridine) iridium(III) for green emission, and...

  • Design of a top mirror for the n-GaAs homojunction far-infrared/terahertz detectors. Deng, G. G.; Zhang, Y. H.; Shen, W. Z. // Journal of Applied Physics;Oct2010, Vol. 108 Issue 7, p074509 

    The top mirror of the resonant cavity enhanced homojunction interfacial workfunction internal photoemission (HIWIP) far-infrared (FIR)/terahertz (THz) detector is investigated. Aiming at an existing half-optimized n-GaAs HIWIP FIR/THz detector, two designs of the top mirror are investigated to...

  • Enhanced quantum efficiency from hybrid cesium halide/copper photocathodes. Lingmei Kong; Joly, Alan G.; Droubay, Timothy C.; Yu Gong; Hess, Wayne P. // Applied Physics Letters;4/28/2014, Vol. 104 Issue 17, p1 

    The quantum efficiency (QE) of Cu is found to increase dramatically when coated by a CsI film and then irradiated by a UV laser. Over three orders of magnitude quantum efficiency enhancement at 266 nm is observed in CsI/Cu(100), indicating potential application in future photocathode devices....

  • Surface and bulk contribution to Cu(111) quantum efficiency. Pedersoli, E.; Greaves, C. M. R.; Wan, W.; Coleman-Smith, C.; Padmore, H. A.; Pagliara, S.; Cartella, A.; Lamarca, F.; Ferrini, G.; Galimberti, G.; Montagnese, M.; dal Conte, S.; Parmigiani, F. // Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p183505 

    The quantum efficiency (QE) of Cu(111) is measured for different impinging light angles with photon energies just above the work function. We observe that the vectorial photoelectric effect, an enhancement of the QE due to illumination with light with an electric vector perpendicular to the...

  • Performance optimization of resonant cavity enhanced n-GaAs homojunction far-infrared detectors: A theoretical study. Zheng, M. M.; Zhang, Y. H.; Shen, W. Z. // Journal of Applied Physics;Apr2009, Vol. 105 Issue 8, p084515 

    The n-GaAs homojunction interfacial workfunction internal photoemission (HIWIP) far-infrared (FIR) detector is investigated to improve the quantum efficiency by simulation. The main structure, the bottom mirror, and the top mirror for the resonant cavity enhanced detector are optimized step by...

  • Deep ultraviolet emitting AlGaN quantum wells with high internal quantum efficiency. Bhattacharyya, A.; Moustakas, T. D.; Lin Zhou; Smith, David. J.; Hug, W. // Applied Physics Letters;5/4/2009, Vol. 94 Issue 18, p181907 

    We report the development of Al0.7Ga0.3N/AlN quantum wells with high internal quantum efficiency. All samples had identical well and barrier thickness but the III/V flux ratio was varied during growth by increasing the Ga flux. The luminescence spectra show single peaks which vary from 220 nm...

  • Direct microscopic correlation of crystal orientation and luminescence in spontaneously formed nonpolar and semipolar GaN growth domains. Bastek, B.; August, O.; Hempel, T.; Christen, J.; Wieneke, M.; Bläsing, J.; Dadgar, A.; Krost, A.; Wendt, U. // Applied Physics Letters;4/26/2010, Vol. 96 Issue 17, p172102 

    We present a direct microscopic correlation between local optical properties, characterized by spectrally resolved cathodoluminescence microscopy and the microscopic crystallographic orientation determined by electron backscatter diffraction at identical sample positions of nonpolar and...


Read the Article


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

Try another library?
Sign out of this library

Other Topics