Inkjet Print Process Devised for Quantum Dot Organic LEDs




  *** Original Post by Alan Kotok from “Science and Enterprise. ***

Engineers at University of Louisville in Kentucky developed a process for making organic light-emitting diodes (OLEDs) with quantum dots and applied with inkjet printing, a common manufacturing technology. The findings of the research team led by Louisville engineering professor Delaina Amos will be presented next week at the Optical Society’s Conference on Lasers and Electro-Optics in San Jose, California.

OLEDs are solid-state devices made with thin films of organic molecules that generate light when an electric current passes through. Displays made with OLEDs can be made much thinner and flexible, and use less power than LED or liquid-crystal displays found in conventional flat-screen televisions or computer monitors. However, widespread manufacturing of OLEDs has been held back because of the cost of materials and their expensive production processes.

The Louisville team aims to create an OLED manufacturing technique with inkjet printing, an established manufacturing process widely used in commercial settings. Their methods use quantum dots made of cadmium selenide, an inorganic material, forming a hybrid type of OLED. Quantum dots are nanoscale semiconductor crystals, which have among other properties photoelectric effects.

These synthesized quantum-dot OLEDs, says Amos, are more efficient than earlier OLEDs and can present a wider spectrum of colors. She adds that they are also less expensive to produce and more environmentally friendly, using low-toxicity materials.

Amos and colleagues demonstrated their technology using cadmium selenide quantum dots in a solution applied with an inkjet printer. The OLEDs are applied in layers, with interfaces between the layers designed to improve the efficiency with which electrons are transferred through the device.

The demonstrations so far created small-scale (1-inch by 1-inch square) OLED devices, but Amos says they can be scaled up to 6 by 6 inches or larger within the next few months. “Ultimately,” notes Amos, “we want to have low cost, low toxicity, and the ability to make flexible devices.”

Read more:

2 comments on “Inkjet Print Process Devised for Quantum Dot Organic LEDs

  1. nanoneophyte says:

    Alan. We are acutely aware of the FUD, but thank you for your suggestion. As noted we routinely receive re-posted or re-blogged articles, impossible to check them all if they are not identified as such.

    We will have Admin check for any other articles from SE and will attempt to place a monitor (filter) on ‘your work’.

    Therefore there will be a very minimal chance ‘your work’ will be found on our Blog again, much to the disappointment of our 25K+ viewers we are sure.

    We will continue of course to research and source our material from the Public Domain, Published Works from Universities and Researchers and ‘with permission’ republications.


    Team GNT


  2. nanoneophyte says:

    Alan. Your ‘original article’ has been so credited. (See post)

    We do not always review re-posts/ re-blogs as from as from an original source.

    If you would like us to exclude any material from S & E in the future, please so indicate. Happy to oblige.

    Team GNT


Please leave us your comments and any suggestions. Thanks! Administrator at GNT

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.