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Applied Physics Letters / Volume 96 / Issue 9 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 96, 093304 (2010); http://dx.doi.org/10.1063/1.3350890 (3 pages)

Influence of the hole blocking layer on blue phosphorescent organic light-emitting devices using 3,6-di(9-carbazolyl)-9-(2-ethylhexyl)carbazole as host material

Nico Seidler1, Sebastian Reineke1, Karsten Walzer1, Björn Lüssem1, Ausra Tomkeviciene2, Juozas V. Grazulevicius2, and Karl Leo1

1Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany
2Department of Organic Technology, Kaunas University of Technology, Kaunas LT-50254, Lithuania

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(Received 18 September 2009; accepted 11 February 2010; published online 4 March 2010)

Organic blue light-emitting devices are essential for the development of future light sources and display technology. Here, we present a highly efficient host-guest system suitable for blue light emission, consisting of the wide gap host material 3,6-di(9-carbazolyl)-9-(2-ethylhexyl)carbazole (TCz1) and the phosphorescent blue emitter iridium(III)bis[(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic). We investigate charge carrier balance as a function of hole blocking layer thickness. For optimized structures, devices with a quantum efficiency as high as 14.3% and a luminous efficacy of 21 lm/W at a luminance of 1000 cd/m2 are realized.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

brightness, organic light emitting diodes, organic semiconductors, wide band gap semiconductors

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3350890

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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  15. The LUMO of TCz1 is derived from the ionization potential measured by cyclic voltammetry (5.8 eV) and the optical gap of ~3.2  eV.
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  17. Alternatively, a 20 nm thick layer of MeO-TPD doped with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) can be used as hole injection layer since the electrical behavior is identical. NDP-2 was chosen due to its improved stability and processing.
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Figures (click on thumbnails to view enlargements)

FIG.1
Phosphorescence spectra of TCz1 and FIrpic together with their chemical structures. The spectrum of TCz1 has been measured in solid polystyrene solution (2 wt %) at a temperature of 77 K about 1 s after pulsed laser excitation (337.1 nm). The PL of FIrpic has been measured on a 80 nm single layer of 2 wt % FIrpic doped into a matrix of 4,4′,4″-tris(N-carbazolyl)-triphenylamine (TCTA) with a spectrofluorometer using a xenon arc lamp as excitation source.

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FIG.2
(a) Layer sequence of the six samples prepared with different TAZ layer thicknesses x of 5, 10, 15, 20, 25, and 30 nm. The BPhen:Cs layer thickness y was varied accordingly to keep the total thickness constant at x+y = 45 nm. (b) The current density vs voltage of the devices. The thicker the TAZ thickness x the brighter the plotted lines.

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FIG.3
External quantum efficiency and applied voltage at a luminance of 1,000 cd/m2 in dependence of the thickness of the TAZ layer. The drawn lines between the EQE data points are guides for the eye while the line for the voltage data is the best-fit line with a slope of 5.3×105 V/cm. The error bars represent a relative error of 5% due to layer thickness variations across the sample.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Current density-voltage and luminance-voltage characteristics of the device with 15 nm TAZ as HBL.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
Luminous efficacy and external quantum efficiency of the 15 nm TAZ device in dependence of luminance.

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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