Analysis of the structure type and working principle of OLED part one

OLEDs are solid-state devices composed of thin sheets of organic molecules that emit light when electricity is applied. OLEDs enable electronic devices to produce brighter, sharper images while consuming less power than traditional light-emitting diodes (LEDs) and liquid crystal displays (LCDs) in use today.

In this article, you will learn how OLED technology works, what types of OLEDs are, the advantages and disadvantages of OLEDs compared to other light-emitting technologies, and some of the problems that OLEDs need to overcome.

Similar to LEDs, OLEDs are solid-state semiconductor devices that are 100-500 nanometers thick, 200 times thinner than a human hair. OLEDs consist of two or three layers of organic materials; according to the latest OLED designs, the third layer assists in the transfer of electrons from the cathode to the emissive layer. This paper mainly deals with the two-tier design model.

Analysis of the structure type and working principle of OLED module

1. The structure of OLED

An OLED consists of the following parts:

Base layer (transparent plastic, glass, metal foil) - The base layer is used to support the entire OLED.

Anode (Transparent) - The anode eliminates electrons (adds electron "holes") as current flows through the device.

Organic Layer - The organic layer consists of organic molecules or organic polymers.

Conductive layer - This layer is composed of organic plastic molecules that transport "holes" from the anode. Polyaniline can be used as a conductive polymer for OLEDs.

Emissive layer - This layer is made up of organic plastic molecules (different from the conductive layer) that transport electrons from the cathode; it is in this layer that the light-emitting process takes place. Polyfluorene can be used as the emissive layer polymer.

Cathode (can be either transparent or opaque, depending on the type of OLED) - The cathode injects electrons into the circuit when current flows through the device.