Performance Enhancement of Polymer Light-Emitting Diodes by Using Ultrathin Fluorinated Polyimide Modifying the Surface of Poly(3,4-ethylene dioxythiophene):Poly(styrenesulfonate)

2009 ◽  
Vol 113 (18) ◽  
pp. 7898-7903 ◽  
Author(s):  
Baohua Zhang ◽  
Wenmu Li ◽  
Junwei Yang ◽  
Yingying Fu ◽  
Zhiyuan Xie ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Performance Enhancement ◽  
Light Emitting ◽  
Fluorinated Polyimide ◽  
Polymer Light Emitting Diodes

scholarly journals PEDOT:PSS/Graphene Nanocomposite Hole-Injection Layer in Polymer Light-Emitting Diodes

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Chun-Hsuan Lin ◽  
Kun-Tso Chen ◽  
Jeng-Rong Ho ◽  
J.-W. John Cheng ◽  
Raymond Chien-Chao Tsiang
Keyword(s):  
Doping Concentration ◽  
Light Emitting Diodes ◽  
Performance Enhancement ◽  
Thermal Reduction ◽  
Hole Injection ◽  
Graphene Oxides ◽  
Light Emitting ◽  
Hole Injection Layer ◽  
Graphene Nanocomposite ◽  
Polymer Light Emitting Diodes

We report on effects of doping graphene in poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate), PEDOT:PSS, as a PEDOT:PSS/graphene nanocomposite hole injection layer on the performance enhancement of polymer light-emitting diodes (PLEDs). Graphene oxides were first synthesized and then mixed in the PEDOT:PSS solution with specifically various amounts. Graphenes were reduced in the PEDOT:PSS matrix through thermal reduction. PLED devices with hole-injection nanocomposite layer containing particular doping concentration were fabricated, and the influence of doping concentration on device performance was examined by systematically characterizations of various device properties. Through the graphene doping, the resistance in the hole-injection layer and the turn-on voltage could be effectively reduced that benefited the injection and transport of holes and resulted in a higher overall efficiency. The conductivity of the hole-injection layer was monotonically increased with the increase of doping concentration, performance indices from various aspects, however, did not show the same dependence because faster injected holes might alter not only the balance of holes and electrons but also their combination locations in the light-emitting layer. Results show that optimal doping concentration was the case with 0.03 wt% of graphene oxide.

Injecting Inter-Layers and the Built-in Potential of Blue Polymer Light-Emitting Diodes

2000 ◽  
Vol 660 ◽  
Author(s):  
Thomas M. Brown ◽  
Ian S. Millard ◽  
David J. Lacey ◽  
Jeremy H. Burroughes ◽  
Richard H. Friend ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Basic Structure ◽  
Thin Layers ◽  
Carrier Injection ◽  
Semiconducting Polymer ◽  
Light Emitting ◽  
Physical Mechanisms ◽  
Organic Solid ◽  
Polymer Light Emitting Diodes

ABSTRACTThe semiconducting-polymer/injecting-electrode heterojunction plays a crucial part in the operation of organic solid state devices. In polymer light-emitting diodes (LEDs), a common fundamental structure employed is Indium-Tin-Oxide/Polymer/Al. However, in order to fabricate efficient devices, alterations to this basic structure have to be carried out. The insertion of thin layers, between the electrodes and the emitting polymer, has been shown to greatly enhance LED performance, although the physical mechanisms underlying this effect remain unclear. Here, we use electro-absorption measurements of the built-in potential to monitor shifts in the barrier height at the electrode/polymer interface. We demonstrate that the main advantage brought about by inter-layers, such as poly(ethylenedioxythiophene)/poly(styrene sulphonic acid) (PEDOT:PSS) at the anode and Ca, LiF and CsF at the cathode, is a marked reduction of the barrier to carrier injection. The electro- absorption results also correlate with the electroluminescent characteristics of the LEDs.

Geometrically isomeric [Ir(iqbt)(ppy)(hpa)] complexes with differential molecule orientations for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

2021 ◽  
Vol 9 (36) ◽  
pp. 12068-12072
Author(s):  
Wentao Li ◽  
Jiaxiang Liu ◽  
Baowen Wang ◽  
Siyu Hou ◽  
Xingqiang Lü ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Dipole Transition ◽  
Transition Dipole ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Polymer Light Emitting Diodes

Based on geometrical isomerisation of [Ir(C^N1)(C^N2)((N^O))]-tris-heteroleptic Ir(iii)-complexes, the augmented transition dipole transition (TMD) with a preferential horizontal orientation, which is beneficial for their NIR-phosphorescence, is reported.

Efficient electron injection in blue-emitting polymer light-emitting diodes with LiF/Ca/Al cathodes

2001 ◽  
Vol 79 (2) ◽  
pp. 174-176 ◽  
Author(s):  
T. M. Brown ◽  
R. H. Friend ◽  
I. S. Millard ◽  
D. J. Lacey ◽  
J. H. Burroughes ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Electron Injection ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

Efficient Single Active Layer Electrophosphorescent White Polymer Light-Emitting Diodes

2008 ◽  
Vol 20 (4) ◽  
pp. 696-702 ◽  
Author(s):  
H. B. Wu ◽  
J. H. Zou ◽  
F. Liu ◽  
L. Wang ◽  
A. Mikhailovsky ◽  
...  
Keyword(s):  
Active Layer ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

scholarly journals Effect of Solvents, Their Mixture and Thermal Annealing on the Performance of Solution Processed Polymer Light-Emitting Diodes

Materials ◽  
2013 ◽  
Vol 6 (5) ◽  
pp. 1994-2006 ◽  
Author(s):  
Mohammad Rezvani ◽  
Farid Farajollahi ◽  
Alireza Nikfarjam ◽  
Parisa Bakhtiarpour ◽  
Erfan Saydanzad
Keyword(s):  
Thermal Annealing ◽  
Light Emitting Diodes ◽  
Solution Processed ◽  
Light Emitting ◽  
Effect Of Solvents ◽  
Polymer Light Emitting Diodes

Efficient flexible polymer light emitting diodes with conducting polymer anodes

2007 ◽  
Vol 17 (33) ◽  
pp. 3551 ◽  
Author(s):  
J. Huang ◽  
X. Wang ◽  
A. J. deMello ◽  
J. C. deMello ◽  
D. D. C. Bradley
Keyword(s):  
Conducting Polymer ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Flexible Polymer ◽  
Polymer Light Emitting Diodes
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