OLED Technology & Operation

- details about OLED, organic LED technology & operation - how an OLED works.

Although OLED technology has a number of basic similarities with those of the traditional inorganic LEDs, there are some major differences.

Not only does organic LED technology differ in the materials that are used, but aspects of OLED operation are also different.

OLED technology basics

there are a number of different variations on the basic OLED technology structure.

The basic OLED comprises an anode and a cathode deposited in a substrate, and sandwiched between these is a layer of organic material.

The organic material is electrically conductive because of what is termed the delocalisation delocalization of pi electrons caused by conjugation over all or part of the molecule.

When used in this way, these organic materials can range from insulators to conductors and are therefore classed as semiconductors.

There are two definitions required, highest unoccupied molecular orbital, HUMO, and the lowest unoccupied molecular orbital, LUMO of organic semiconductors. These are analogous to the valence and conduction bands of inorganic semiconductors.

The OLED display consists of a number of layers. A typical stack may include:

  • Anode
  • Emissive layer
  • Conductive layer
  • Cathode

Diagrammatic structure of an OLED
Diagrammatic structure of an OLED

By Ian Poole

<< Previous   |   Next >>

Share this page

Want more like this? Register for our newsletter

GaN’s Ground-Floor Opportunity Rudy Ramos | Mouser Electronics
GaN’s Ground-Floor Opportunity
The electronics industry has a major role to play in helping to save energy, by enabling better equipment and new ways of working and living that that are more efficient and environmentally friendly. Maintaining the pace of technological progress is key, but improvements become both smaller and harder to achieve as each technology matures. We can see this trend in the development of power semiconductors, as device designers seek more complex and expensive ways to reduce switching energy and RDS(ON) against silicon’s natural limitations.

Radio-Electronics.com is operated and owned by Adrio Communications Ltd and edited by Ian Poole. All information is © Adrio Communications Ltd and may not be copied except for individual personal use. This includes copying material in whatever form into website pages. While every effort is made to ensure the accuracy of the information on Radio-Electronics.com, no liability is accepted for any consequences of using it. This site uses cookies. By using this site, these terms including the use of cookies are accepted. More explanation can be found in our Privacy Policy