Thickness-dependent changes in the optical properties of PPV- and PF-based polymer light emitting diodes

2003 ◽  
Vol 68 (5) ◽  
Author(s):  
J. M. Leger ◽  
S. A. Carter ◽  
B. Ruhstaller ◽  
H.-G. Nothofer ◽  
U. Scherf ◽  
...  
Keyword(s):  
Optical Properties ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

Novel microlens arrays with embedded Al2O3nanoparticles for enhancing efficiency and stability of flexible polymer light-emitting diodes

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65450-65458 ◽  
Author(s):  
Young Yun Kim ◽  
Jung Jin Park ◽  
Seong Ji Ye ◽  
Woo Jin Hyun ◽  
Hyeon-Gyun Im ◽  
...  
Keyword(s):  
Optical Properties ◽  
Light Emitting Diodes ◽  
Microlens Arrays ◽  
Light Emitting ◽  
Flexible Polymer ◽  
Polymer Light Emitting Diodes ◽  
Enhance Efficiency ◽  
Silica Hybrid

Microlens arrays were newly fabricated with silica hybrid sol and Al2O3nanoparticles, to enhance efficiency and stability of polymer light-emitting diodes, as well as to minimize changes in optical properties.

Electrical and Optical Properties of Green Polymer Light Emitting Diodes with Various Structures of Au Nanoparticles

2015 ◽  
Vol 15 (10) ◽  
pp. 7693-7698
Author(s):  
Byung Min Park ◽  
Gi Ppeum Kim ◽  
Sae Chan Mun ◽  
Ho Jung Chang
Keyword(s):  
Optical Properties ◽  
Au Nanoparticles ◽  
Light Emitting Diodes ◽  
Synthesis Method ◽  
Hole Injection ◽  
Electrical And Optical Properties ◽  
Au Nps ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Green Polymer

The green polymer light emitting diodes (PLEDs) were fabricated using the solution precursor synthesis method. To improve the device’s electrical and optical properties, gold (Au) nanoparticles (NPs) were added to the hole injection layer (HIL) with poly(3,4-ethylene-dioxythiophene): poly(styrenesulfolnate) (PEDOT:PSS) organic material. The green PLED devices with a structure of glass/ITO/PEDOT:PSS+Au NPs/PVK:Ir(ppy)3/TPBi/LiF/Al were prepared by conventional spin-coating and thermal evaporation methods. Various concentrations of Au NPs were doped to the HILs to optimize the device’s light emitting characteristic. The effects of Au NPs concentrations on the properties of PLEDs were investigated. The doping concentrations of Au NPs were changed ranging from 0.0 to 1.0 vol%. At the optimized Au NPs concentration of 0.5 vol%, we also studied the effects of various film layers with and without Au NPs on the properties of PLEDs. The maximum luminance and external quantum efficiency of the devices were found to be 20430 cd/m2 and 7.49%, respectively.

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
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