scholarly journals High-Performance Transparent PEDOT: PSS/CNT Films for OLEDs

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2067
Author(s):  
Ying Tian ◽  
Tao Wang ◽  
Qingxia Zhu ◽  
Xingcai Zhang ◽  
Anita Sagadevan Ethiraj ◽  
...  
Keyword(s):  
Sheet Resistance ◽  
High Performance ◽  
Operating Voltage ◽  
Adhesion Properties ◽  
Light Emitting ◽  
Conductive Films ◽  
Substrate Adhesion ◽  
Excellent Adhesion ◽  
The Stability ◽  
Poly Styrene Sulfonate

Improved OLED systems have great potential for next-generation display applications. Carbon nanotubes (CNTs) and the conductive polymers poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS) have attracted great interest for advanced applications, such as optoelectronic products. In this paper, the simultaneous enhancement of the conductivity, roughness, and adhesion properties of transparent conductive films with PEDOT: PSS/CNTs is reported. These films prepared by a simple spin-coating process were successfully used to produce high-performance organic light-emitting diodes (OLEDs) with an improved lifetime. Addition of PEDOT: PSS lowered the film sheet resistance and CNTs helped to enhance the stability and maintain the lifetime of the OLEDs. In addition, treatment with methanol and nitric acid changed the morphology of the polymer film, which led to greatly reduced sheet resistance, enhanced substrate adhesion, and reduced film roughness. The best performance of the film (PEDOT: PSS: CNT = 110: 1, W/W) was 100.34 Ω/sq.@ 90.1 T%. High transmittance, low sheet resistance, excellent adhesion, and low roughness (3.11 nm) were achieved synchronously. The fabricated OLED demonstrated a low minimum operating voltage (3 V) and could endure high voltage (20 V), at which its luminance reached 2973 cd/m2. Thus, the incorporation of CNTs within PEDOT: PSS electrodes has great potential for the improvement of the performance of OLED devices.

Cohosts with efficient host-to-emitter energy transfer for stable blue phosphorescent organic light-emitting diodes

2021 ◽  
Author(s):  
Soo-Ghang Ihn ◽  
Eun Suk Kwon ◽  
Yongsik Jung ◽  
Jong Soo Kim ◽  
Sungho Nam ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Performance ◽  
Light Emitting Diode ◽  
Organic Light Emitting Diodes ◽  
Operating Voltage ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Low Efficiency ◽  
Blue Phosphorescent

We present a high-performance blue phosphorescent organic light-emitting diode exhibiting a low operating voltage (4.1 V), high external quantum efficiency (23.4%, at 500 cd m-2) with a low efficiency roll-off...

Silica coating enhances the stability of inorganic perovskite nanocrystals for efficient and stable down-conversion in white light-emitting devices

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20131-20139 ◽  
Author(s):  
Fei Zhang ◽  
Zhi-Feng Shi ◽  
Zhuang-Zhuang Ma ◽  
Ying Li ◽  
Sen Li ◽  
...  
Keyword(s):  
White Light ◽  
High Performance ◽  
Silica Coating ◽  
White Led ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Improved Stability ◽  
The Stability ◽  
Down Conversion

CsPbBr3 QDs/silica composites with substantially improved stability were applied as the color-converting layer for high-performance white LED fabrication.

A NEW STRUCTURE OF FLEXIBLE OLED WITH COPPER NANOWIRE ANODE AND GRAPHERE OXIDE/PEDOT: PSS ANODE BUFFER LAYER

2019 ◽  
Vol 27 (07) ◽  
pp. 1950171
Author(s):  
PING LIU ◽  
JIANGHAO WANG ◽  
JIE CHENG ◽  
LIMING LIU ◽  
HONGHANG WANG ◽  
...  
Keyword(s):  
Buffer Layer ◽  
Low Cost ◽  
Transparent Electrode ◽  
Driving Voltage ◽  
Large Area ◽  
Light Emitting ◽  
Conductive Films ◽  
Copper Nanowire ◽  
Anode Buffer Layer ◽  
Poly Styrene Sulfonate

A flexible organic light-emitting device (OLED) was produced using copper nanowire (CuNW) film as anode and Graphene oxide (GO)/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) film as anode buffer layer. Compared with other transparent conductive films (TCFs), CuNWs are low cost, easy to fabricate, and compatible with flexible substrates over a large area. Due to these advantages, CuNWs are showing greater and greater promise for the next generation of TCF. Modified by PEDOT:PSS, the conductivity and work function of the CuNW film can be dramatically enhanced. However, PEDOT:PSS is highly acidic and easy to corrode the CuNW film, which will reduce maximum luminous brightness and current efficiency of the OLED. In this paper, GO/PEDOT:PSS was used as anode buffer layer to modify the CuNW anode and the composite transparent electrode exhibited excellent optoelectrical properties. The driving voltage of the OLED with CuNW/PEDOT:PSS is 6.2[Formula: see text]V, and the maximum luminous brightness is 2737.2[Formula: see text]cd/m2. The driving voltage of the OLED with CuNW/GO/PEDOT:PSS anode was reduced to 5.1[Formula: see text]V, and the maximum luminous brightness was improved to 3007.4[Formula: see text]cd/m2.

scholarly journals High-Conductivity, Flexible and Transparent PEDOT:PSS Electrodes for High Performance Semi-Transparent Supercapacitors

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 450 ◽  
Author(s):  
Jiaxing Song ◽  
Guoqiang Ma ◽  
Fei Qin ◽  
Lin Hu ◽  
Bangwu Luo ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Light Emitting Diode ◽  
High Specific Capacitance ◽  
Transparent Electrode ◽  
High Conductivity ◽  
High Rate ◽  
Light Emitting ◽  
Poly Styrene Sulfonate

Herein, we report a flexible high-conductivity transparent electrode (denoted as S-PH1000), based on conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), and itsapplication to flexible semi-transparentsupercapacitors. A high conductivity of 2673 S/cm was achieved for the S-PH1000 electrode on flexible plastic substrates via a H2SO4 treatment with an optimized concentration of 80 wt.%. This is among the top electrical conductivities of PEDOT:PSS films processed on flexible substrates. As for the electrochemical properties,a high specific capacitance of 161F/g was obtained from the S-PH1000 electrode at a current density of 1 A/g. Excitingly, a specific capacitance of 121 F/g was retained even when the current density increased to 100 A/g, which demonstrates the high-rate property of this electrode. Flexible semi-transparent supercapacitors based on these electrodes demonstrate high transparency, over 60%, at 550 nm. A high power density value, over 19,200 W/kg,and energy density, over 3.40 Wh/kg, was achieved. The semi-transparent flexible supercapacitor was successfully applied topower a light-emitting diode.

Gravure contact printing of flexible, high-performance polymer light emitting diodes for large-area displays and lighting

2011 ◽  
Vol 1340 ◽  
Author(s):  
Alasdair J. Campbell ◽  
Dae-Young Chung ◽  
Jingsong Huang ◽  
Dong-Seok Leem ◽  
Donal D. C. Bradley
Keyword(s):  
High Performance ◽  
Light Emitting Diode ◽  
Hole Injection ◽  
Large Area ◽  
Contact Printing ◽  
Light Emitting ◽  
High Performance Polymer ◽  
Printing Technique ◽  
Polymer Light Emitting Diodes ◽  
Poly Styrene Sulfonate

ABSTRACTGravure contact printing is the highest volume, large area printing technique known. It is ideally suited for the fabrication of large-area polymer light emitting diode (PLED) based lighting, backlights and displays. Here we show how gravure can be used to fabricate the poly (3,4-ethylene dioxythiophene) : poly(styrene sulfonate) hole injection layer and the light emitting polymer emissive layer in a conventional PLED, as well as the cesium carbonate electron injection layer in an inverted PLED. The performance equals or exceeds that of devices where these layers are deposited by conventional spin-coating.

scholarly journals Organic light-emitting devices based on conducting polymer treated with benzoic acid

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hwa Seung Kang ◽  
Dae Hun Kim ◽  
Tae Whan Kim
Keyword(s):  
Benzoic Acid ◽  
Mechanical Stability ◽  
Operating Voltage ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
Poly Styrene Sulfonate ◽  
Enhanced Conductivity

AbstractWe report on the enhanced conductivity of the benzoic-acid-treated poly(3,4-ethlenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) electrode for use in highly flexible, organic light-emitting devices (OLEDs). The conductivity of the benzoic-acid-treated PEDOT:PSS electrode increased from 1 to 1583.2 S/cm, in comparison with that of the pristine PEDOT:PSS electrode, due to a complex factor of the H+ mole % and the dielectric constant of the benzoic solution. Among the post-treatment methods of the PEDOT:PSS electrodes, the operating voltage at 1000 cd/m2 of OLEDs fabricated utilizing the PEDOT:PSS electrode with the benzoic acid treatment has the lowest value, and its maximum luminance is 24,400 cd/m2, which are 1.54 and 2.15 times higher than those of OLEDs using PEDOT:PSS electrodes treated with dimethyl sulfoxide and methanol, respectively. The luminance of a flexible OLED with a benzoic-acid-treated PEDOT:PSS electrode after 1400 bending cycles decreased to 83% of the initial luminance, resulting in excellent mechanical stability.

Inkjet printing of flexible high-performance carbon nanotube transparent conductive films by “coffee ring effect”

Nanoscale ◽  
2014 ◽  
Vol 6 (19) ◽  
pp. 11084-11089 ◽  
Author(s):  
Allon Shimoni ◽  
Suzanna Azoubel ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotube ◽  
Sheet Resistance ◽  
Inkjet Printing ◽  
High Performance ◽  
Flexible Substrate ◽  
Transparent Conductors ◽  
Transparent Conductive Films ◽  
Conductive Films ◽  
Direct Patterning ◽  
Coffee Ring Effect

Inkjet printing of CNT “coffee rings” on a flexible substrate is reported enabling direct patterning of transparent conductors with a sheet resistance of 156 Ω sq−1 and transparency of 81%.

Dietary Vitamin and Stability of Oral Anticoagulation: Proposal of a Diet with Constant Vitamin K1 Content

1997 ◽  
Vol 77 (03) ◽  
pp. 504-509 ◽  
Author(s):  
Sarah L Booth ◽  
Jacqueline M Charnley ◽  
James A Sadowski ◽  
Edward Saltzman ◽  
Edwin G Bovill ◽  
...  
Keyword(s):  
Dietary Intake ◽  
Vitamin K ◽  
High Performance ◽  
Case Reports ◽  
Food Composition ◽  
Dietary Guidelines ◽  
Dietary Vitamin ◽  
Vitamin K1 ◽  
The Stability ◽  
The Impact

SummaryCase reports cited in Medline or Biological Abstracts (1966-1996) were reviewed to evaluate the impact of vitamin K1 dietary intake on the stability of anticoagulant control in patients using coumarin derivatives. Reported nutrient-drug interactions cannot always be explained by the vitamin K1 content of the food items. However, metabolic data indicate that a consistent dietary intake of vitamin K is important to attain a daily equilibrium in vitamin K status. We report a diet that provides a stable intake of vitamin K1, equivalent to the current U.S. Recommended Dietary Allowance, using food composition data derived from high-performance liquid chromatography. Inconsistencies in the published literature indicate that prospective clinical studies should be undertaken to clarify the putative dietary vitamin K1-coumarin interaction. The dietary guidelines reported here may be used in such studies.

Tetraphenylbenzene-based AIEgens: the Horizontally Oriented Emitters for highly Efficient Non-doped Deep Blue OLEDs and Host for High-Performance Hybrid WOLEDs

2020 ◽  
Author(s):  
Pengbo Han ◽  
Zeng Xu ◽  
Chengwei Lin ◽  
Dongge Ma ◽  
Anjun Qin ◽  
...  
Keyword(s):  
High Performance ◽  
General Strategy ◽  
Flat Panel Displays ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Deep Blue ◽  
Full Color ◽  
High Emission ◽  
White Oleds ◽  
Low Efficiency

Deep blue organic-emitting fluorophores are crucial for application in white lighting and full color flat-panel displays but emitters with high color quality and efficiency are rare. Herein, novel deep blue AIE luminogens (AIEgens) with various donor units and an acceptor of cyano substituted tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting from its high emission efficiency and high proportion of horizontally oriented dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA realized a maximum external quantum efficiency 7.27%, with a low efficiency roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color hybrid warm white OLEDs (CIE<sub>x,y</sub> = 0.43, 0.45) were achieved using CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized maximum current, power, external quantum efficiencies 58.0 cd A<sup>-1</sup>, 60.7 lm W<sup>-1</sup> and 19.1%, respectively. This work provides a general strategy to achieve high performance, stable deep blue and hybrid white OLEDs by construction of AIEgens with excellent horizontal orientation

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