Preparation and Characterization of Polymer Light Emitting Diodes with ITO/PEDOT:PSS/MEH-PPV/LiF/Al Structure

2006 ◽  
Vol 321-323 ◽  
pp. 1699-1703 ◽  
Author(s):  
Jae Hyouk Yoo ◽  
Ho Jung Chang ◽  
Su Cheol Gong ◽  
In Jae Baek ◽  
Hyun Seong Lim ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Oxide Glass ◽  
Light Emitting ◽  
Glass Substrates ◽  
Ito Glass ◽  
Coating Method ◽  
Polymer Light Emitting Diodes

Polymer light emitting diodes (PLEDs) with ITO/PEDOT:PSS/MEH-PPV/LiF/Al structures were prepared by spin coating method on the patterned ITO(indium tin oxide)/glass substrates. MEH-PPV [Poly(2-methoxy-5(2-ethylhexoxy)-1,4-phenylenevinyle)] and PEDOT:PSS [poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)] polymers were used as the light emitting and hole transport materials. The dependence of the plasma treatment of ITO anode films on the optical and electrical properties of the PLEDs was investigated. The sheet resistances increased with increasing the plasma intensities from 40W to 300W in RF power. In contrast, the surface roughness was improved as the plasma intensity increased. The maximum current density and luminance were found to be about 97.5 mA/ and 55 cd/m2 at 8 V for the PLED sample coated on ITO/glass substrate with plasma treatment of 100W for 30s under 40 mtorr O2 pressure.

Properties of Polymer Light Emitting Diodes with Blue Color on ITO/Glass Substrates

2007 ◽  
Vol 124-126 ◽  
pp. 439-442 ◽  
Author(s):  
Jae Hyouk Yoo ◽  
Su Cheol Gong ◽  
In Jae Baek ◽  
Hyun Seong Lim ◽  
Sang Baie Shin ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Oxide Glass ◽  
Blue Color ◽  
Light Emitting ◽  
Glass Substrates ◽  
Ito Glass ◽  
Polymer Light Emitting Diodes ◽  
Ito Films

Polymer light emitting diodes (PLEDs) with ITO/PEDOT:PSS/PVK/PFO-poss/LiF/Al structure were prepared by spin coating method on the plasma-treated ITO(indium tin oxide)/glass substrates. PVK(N-vinylcabozole) and PEDOT:PSS [poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)] polymers were used as hole injection and transport materials. As blue light emitting material, PFO-poss(poly(9,9-dioctylfluorence) polymer was used. The dependence of the plasma treatment of ITO films on the optical and electrical properties of the PLEDs was investigated. The sheet resistance of ITO films increased slightly with increasing the plasma intensity from 20W to 300W in RF power. In contrast, the surface roughness was improved as the plasma intensity increased. The maximum current density and luminance were about 20 mA/cm2 and 250 cd/m2 at 9 V for the PLED sample coated on ITO/glass substrate with plasma treatment of 100W for 30s under 40 mtorr O2 pressure. The maximum emission spectrum of the PLEDs was 441 nm showing blue color.

Properties of polymer light-emitting diodes coated on surface-treated ITO/glass substrates

2008 ◽  
Vol 110 (6) ◽  
pp. 3678-3682 ◽  
Author(s):  
Sang-Baie Shin ◽  
Su-Cheol Gong ◽  
Ji-Keun Jang ◽  
Myoung-Seon Gong ◽  
Young-Chul Chang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Glass Substrates ◽  
Ito Glass ◽  
Polymer Light Emitting Diodes

Properties of Polymer Light Emitting Diodes with Blue Color on ITO/Glass Substrates

2007 ◽  
pp. 439-442
Author(s):  
Jae Hyouk Yoo ◽  
Su Cheol Gong ◽  
In Jae Baek ◽  
Hyun Seong Lim ◽  
Sang Baie Shin ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Blue Color ◽  
Light Emitting ◽  
Glass Substrates ◽  
Ito Glass ◽  
Polymer Light Emitting Diodes

Improved electroluminescence lifetime and efficiency of polymer light- emitting diodes with plasma-treated indium tin oxide anodes

1999 ◽  
Vol 558 ◽  
Author(s):  
J. S. Kim ◽  
R. H. Friend ◽  
F. Cacialli
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Oxygen Plasma ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Transport Layer ◽  
Constant Current ◽  
Hole Transport Layer ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

ABSTRACTWe studied the influence of various surface treatments of indium-tin oxide anodes on the operational stability of high-efficiency green-emitting polymer light-emitting diodes, fabilicated with a doped poly(3,4-ethylene dioxythiophene) PEDOT hole transport layer, a polyfluorene-based emissive layer, and Ca-Al cathodes. The anodes were modified by physical (oxygen-plasma), chemical (aquaregia), or combined treatments. Oxygen-plasma improves the stability under constant current over all the other anodes, with half-brightness lifetimes (initial brightness, 200 cd/m2) two to five times longer than for untreated samples, and 1000 times longer than for aquaregia ones. We derive two major indications for optimisation of PLEDs. First, thermal management of the diode is of the uppermost importance. Second, the ITO anode and in general the electrical properties of the hole-injecting contact are crucial to device operation, even in the presence of a hole transport layer.

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.

Fabrication of Micro-OLEDs by Room-temperature Curing Nanocontact-print Lithography Using DLC Molds

2012 ◽  
Vol 1511 ◽  
Author(s):  
Ippei Ishikawa ◽  
Keisuke Sakurai ◽  
Shuji Kiyohara ◽  
Taisuke Okuno ◽  
Hideto Tanoue ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Nanoimprint Lithography ◽  
Room Temperature ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Insulating Layer ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Ito Glass

ABSTRACTThe microfabrication technologiesfor organic light-emitting devices (OLEDs) are essential to the fabrication of the next generation of light-emitting devices. The micro-OLEDs fabricated by room-temperature curing nanoimprint lithography (RTC-NIL) using diamond molds have been investigated. However, light emissions from 10 μm-square-dot OLEDs fabricated by the RTC-NIL method have not been uniform. Therefore, we proposed the fabrication of micro-OLEDs by room-temperature curing nanocontact-print lithography (RTC-NCL) using the diamond-like carbon (DLC) mold. The DLC molds used in RTC-NCL were fabricated by an electron cyclotron resonance (ECR) oxygen ion shower with polysiloxane oxide mask in electron beam (EB) lithography technology. The mold patterns are square and rectangle dots which has 10 µm-width, 10 µm-width and50 µm-length, respectively. The height of the patterns is 500 nm. The DLC molds were used to form the insulating layer of polysiloxane in RTC-NCL. We carried out the RTC-NCL process using the DLC mold under the following optimum conditions: 0.1 MPa-pressure for coating DLC mold with polysiloxane film, 2.1 MPa-pressure for transferring polysiloxane from DLC mold pattern to indium tin oxide (ITO) glass substrate. We deposited N, N'-Diphenyl -N, N'-di (m-tolyl)benzidine (TPD) [40 nm-thickness] as hole transport layer / Tris(8-quinolinolato)aluminum (Alq3) [40 nm-thickness] as electron transport layer / Al [200 nm-thickness] as cathode on ITO glass substrateas anode in this order. We succeeded in formation of the insulating layer with square and rectangle dots which has 10 µm-width,10 µm-width and 50 µm-length, and operation of micro-OLEDs by RTC-NIL using DLC molds.

Imprinted nonoxidized graphene sheets as an efficient hole transport layer in polymer light-emitting diodes

2014 ◽  
Vol 104 (7) ◽  
pp. 073111 ◽  
Author(s):  
Chun-Yuan Huang ◽  
I-Wen Peter Chen ◽  
Chih-Jung Chen ◽  
Ray-Kuang Chiang ◽  
Hoang-Tuan Vu
Keyword(s):  
Light Emitting Diodes ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Graphene Sheets ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

Highly efficient single-layer blue polymer light-emitting diodes based on hole-transporting group substituted poly(fluorene-co-dibenzothiophene-S,S-dioxide)

2017 ◽  
Vol 5 (37) ◽  
pp. 9680-9686 ◽  
Author(s):  
Feng Peng ◽  
Na Li ◽  
Lei Ying ◽  
Wenkai Zhong ◽  
Ting Guo ◽  
...  
Keyword(s):  
Blue Light ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Random Copolymer ◽  
Hole Transport ◽  
Light Emitting ◽  
Hole Transporting ◽  
Polymer Light Emitting Diodes ◽  
Copolymer Poly

We developed a series of high-performance blue light-emitting polymers that contain hole-transport moieties comprising carbazole or triphenylamine substituents in the side chains of random copolymer poly(fluorene-co-dibenzothiophene-S,S-dioxide) (PFSO).

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