Journal ArticleDOI
Analysis of metal-oxide-based charge generation layers used in stacked organic light-emitting diodes
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TLDR
In this paper, the authors studied electron and hole injection in MoO3 charge generation layers (CGLs) commonly used for establishing balanced injection in multilayer stacked organic light-emitting diodes (SOLEDs).Abstract:
We study electron and hole injection in MoO3 charge generation layers (CGLs) commonly used for establishing balanced injection in multilayer stacked organic light-emitting diodes (SOLEDs). A compound CGL consisting of 100-A-thick MoO3 and Li-doped 4,7-diphenyl-1,10-phenanthroline in a 1:1 molar ratio is demonstrated to have a high electron generation efficiency. Charge injection from the compound CGL is modeled based on a two-step process consisting of tunneling-assisted thermionic emission over an injection barrier of (1.2±0.2) eV and a trap level due to oxygen vacancies at (0.06±0.01) eV above the MoO3 valence band edge. Peak external quantum efficiencies (EQEs) of (10.5±0.2)%, (10.1±0.2)%, (8.6±0.2)%, and (8.9±0.2)% are obtained for tris-(phenylpyridine)iridium-based electrophosphorescent OLEDs with indium tin oxide (ITO) anode/CGL cathode, CGL anode/CGL cathode, CGL anode/Al cathode, and ITO anode/Al cathode contacts, respectively. Based on our analysis, a three-element green emitting electrophosphorescent SOLED is demonstrated with a peak forward-viewing EQE=(24.3±1.0)% and a power efficiency of (19±1) lm/W.read more
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Journal ArticleDOI
Transition Metal Oxides for Organic Electronics: Energetics, Device Physics and Applications
TL;DR: An overview of TMO-based device architectures ranging from transparent OLEDs to tandem OPV cells is given, and various TMO film deposition methods are reviewed, addressing vacuum evaporation and recent approaches for solution-based processing.
Journal ArticleDOI
Improved Current Extraction from ZnO/PbS Quantum Dot Heterojunction Photovoltaics Using a MoO3 Interfacial Layer
Patrick O. Brown,Richard R. Lunt,Ni Zhao,Timothy P. Osedach,Darcy D. Wanger,Liang-Yi Chang,Moungi G. Bawendi,Vladimir Bulovic +7 more
TL;DR: It is demonstrated that improvements in power conversion efficiency may be attained for ZnO/PbS heterojunction quantum dot photovoltaics through the incorporation of a MoO(3) interlayer between the PbS colloidal quantum dot film and the top-contact anode.
Journal ArticleDOI
Charge generation layers comprising transition metal-oxide/organic interfaces: Electronic structure and charge generation mechanism
TL;DR: In this article, the authors show that the charge generation process occurs at the interface between the hole-transport material (TCTA) and WO3 and not, as commonly assumed, at the interfaces between TCTA and the n-doped electron transporters (BPhen:Cs2CO3).
Patent
Organic light emitting diode device
Jae-Yong Lee,Jung-Sub Lee +1 more
Abstract: An organic light emitting diode (OLED) device is provided The OLED device includes: a substrate; an anode formed on the substrate; a first organic thin layer formed on the anode; an organic emission layer formed on the first organic thin layer; a second organic thin layer formed on the organic emission layer; and a cathode formed on the second organic thin layer, wherein the first and second organic thin layers are formed in a single layer or a multi-layer, and at least a part of the first or second organic thin layer is doped with or formed of an insulator The OLED device provides excellent durability, long life-time, and increased luminous efficiency by balanced charge injection caused by doping or stacking the insulator into or on the organic thin layer
Journal ArticleDOI
Review paper: Recent developments in light extraction technologies of organic light emitting diodes
Kihyon Hong,Jong-Lam Lee +1 more
TL;DR: In this article, the authors reviewed the technical issues and recent progress in light extraction technologies and discussed ways of enhancing the out-coupling efficiency of OLEDs, which offers the greatest potential for achieving a substantial increase in the external quantum efficiency and power efficiency.
References
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Journal ArticleDOI
Very high-efficiency green organic light-emitting devices based on electrophosphorescence
TL;DR: In this paper, the performance of an organic light-emitting device employing the green electrophosphorescent material, fac tris(2-phenylpyridine) iridium [Ir(ppy)3] doped into a 4,4′-N,N′-dicarbazole-biphenyl host was described.
Journal ArticleDOI
Nearly 100% internal phosphorescence efficiency in an organic light emitting device
TL;DR: In this paper, the authors demonstrate very high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent molecule doped into a wide energy gap host, achieving a maximum external quantum efficiency of 19.0±1.0 and luminous power efficiency of 60±5 lm/W.
Book
Device electronics for integrated circuits
TL;DR: In this article, the authors present a list of symbols for metal-oxide-silicon systems, including Mos Field-effect transistors, high-field effects, and high-frequency effects.
Journal ArticleDOI
White Stacked Electrophosphorescent Organic Light‐Emitting Devices Employing MoO3 as a Charge‐Generation Layer
Hiroshi Kanno,Hiroshi Kanno,Russell J. Holmes,Yiru Sun,Stéphane Kéna-Cohen,Stephen R. Forrest +5 more
Journal ArticleDOI
High-efficiency red electrophosphorescence devices
Chihaya Adachi,Marc A. Baldo,Stephen R. Forrest,Sergey Lamansky,Mark E. Thompson,Raymond Kwong +5 more
TL;DR: In this article, the authors demonstrate high-efficiency red electrophosphorescent organic light-emitting devices employing bis(2′-benzo[4,5-a]thienyl)pyridinato-N,C3′) iridium(acetylacetonate) [Btp2Ir(acac)] as a red phosphor.