Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



ENERGY TECH
OLED displays and solid-state lightings in mass production, coming soon
by Staff Writers
Seoul, South Korea (SPX) Mar 08, 2016


File image.

A team led by Prof. Tae-Woo Lee (Dept. of Materials Science and Engineering) at POSTECH have fabricated highly-efficient, solution-processed fluorescence organic light-emitting diodes (OLEDs) using pure-organic thermally-activated delayed-fluorescence (TADF) emitters.

Conventional OLEDs use the phosphorescent emitters which have shown high internal quantum efficiency (IQE) of nearly 100%. However, they should incorporate precious heavy metals such as iridium and platinum into phosphorescent metal-complexes; these limit their commercialization.

In order to overcome these disadvantages, the research team uses pure-organic TADF emitters which can show a very high IQE of nearly 100% without precious metals.

Furthermore, TADF emitters have advantages of easy synthesis using pure-organic molecules and versatile molecular design, thus, reduce the synthesis cost.

They also introduced the inexpensive, simple solution-process to fabricate the TADF-OLEDs by solving fundamental problems which limit the high efficiency in solution processed TADF-OLEDs.

A multi-functional buffer hole injection layer (Buf-HIL) that can increase the hole injection capability to the emitting layer (EML) due to its high work function, and also improve the luminescence efficiency of TADF-OLEDs by preventing exciton quenching at the HIL/EML interface was employed.

Furthermore, new polar aprotic solvent improved the device efficiency by improving the solubility of pure-organic TADF emitters, reducing the surface roughness and the aggregation of dopants, and managing the exciton quenching in the emitting layer.

This improvement in solution processed TADF-OLEDs will remedy the disadvantages of a complex and expensive vacuum-deposition process and thus lower the production cost of the devices. It is of prime importance to reduce the production cost of the devices from the perspective of industrial mass-production of OLED displays and solid-state lightings.

Prof. Tae-Woo Lee mentioned, "This technology is a big leap toward the development of inexpensive and solution-processed OLED displays and solid-state lightings because this method uses only low-cost pure-organic molecules and simple solution process to realize the extremely high efficiency solution-processed OLEDs."

The research was published in Advanced Materials journal. This research is selected as a most significant paper and open to the public as a "Layman's abstract".


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
Pohang University of Science and Technology
Powering The World in the 21st Century at Energy-Daily.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
ENERGY TECH
Device 'fingerprints' could help protect power grid, other industrial systems
Atlanta GA (SPX) Mar 04, 2016
Human voices are individually recognizable because they're generated by the unique components of each person's voice box, pharynx, esophagus and other physical structures. Researchers are using the same principle to identify devices on electrical grid control networks, using their unique electronic "voices" - fingerprints produced by the devices' individual physical characteristics - to de ... read more


ENERGY TECH
NASA May Return to Moon, But Only After Cutting Off ISS

Lunar love: When science meets artistry

New Lunar Exhibit Features NASA's Lunar Reconnaissance Orbiter Imagery

NASA releases strange 'music' heard by 1969 astronauts

ENERGY TECH
Monster volcano gave Mars extreme makeover: study

SSL developing robotic sample handling assembly for Mars 2020

MAVEN Observes Mars Moon Phobos in the Mid- and Far-Ultraviolet

Rover begins contact science of rock target on Knudsen Ridge

ENERGY TECH
Less connectivity improves innovation

Orion launch abort motor case passes structural qualification test

Launch America: Suni Williams on Commercial Crew

Orion Solar Array Wing Deployment Test is a Success

ENERGY TECH
Moving in to Tiangong 2

Logistics Rule on Tiangong 2

China to launch second space lab Tiangong-2 in Q3

China's moon lander Chang'e-3 enters 28th lunar day

ENERGY TECH
International Space Station's '1-year crew' returns to Earth

Scott Kelly and Mikhail Kornienko return to Earth after One-Year Mission

Paragon wins NASA ISS water processor development contract

NASA's Science Command Post Supports Scott Kelly's Year In Space

ENERGY TECH
At last second, SpaceX delays satellite launch again

Arianespace Soyuz to launch 2 Galileo satellites in May

SpaceX postpones rocket launch again

Russian rocket engines ban could leave US space program in limbo

ENERGY TECH
Imaging Technique May Help Discover Earth-Like Planets Around Other Stars

Newly discovered planet in the Hyades cluster could shed light on planetary evolution

Imaging technique may help discover Earth-like planets

Longest-Lasting Stellar Eclipse Discovered

ENERGY TECH
University of Kentucky physicist discovers new 2-D material that could upstage graphene

Disney automated system lets characters leap and bound realistically in virtual worlds

New catalyst makes hydrogen peroxide accessible to developing world

Research demonstrates that air data can be used to reconstruct radiological releases




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement