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

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