what is the Full Form of OLED

Organic LEDs or Organic Light-Emitting Diodes are the full forms of OLED, and OLED has another name called organic EL diode or organic electroluminescent diode.

Electroluminescent is a property in which light may be emitted from the material where the electric current passes through it.


It is a combination of the optical and electrical phenomenon that a material emits light in response to the pass of electrical current, this may have happened at the recombination process of electrons and holes at a Semiconductor material, and which when photons releases.

The LEDs work with the same process, and OLED is much similar to LEDs.

OLED construction

The construction of OLEDs are almost same as normal LEDs, n-type and p-type semiconductor is used to emit light from LEDs, but OLED replaces semiconductor material with organic material.

  • At OLEDs we have 6 layers of organic material, here we start from the bottom substrate layers, and it’s a basic part of OLED, which is made with a glass of foil substances.
  • And then Anode, the anode of OLED will acts as an emitter of the device, as when input supply passes they release electrons.
  • The cathode is the layer uses to generate electrons when the power supply is connected.
  • The next organic or conductive layer, the conductive layer also called the organic layer, they are the key part of this whole construction OLED, this layer is constructed with polymer as conductive material with hydrogen.

This particular layer is responsible for the movement of holes from anode to cathode.

  • The Emissive layer is used to transfer electrons from cathode to anode, they are made up of organic material called plastic molecules, and here is where the light produces.


OLED working

The working of OLED is the same as general LEDs after when the power supply is connected to the OLED, a current flows through the input and the electron passes towards the cathode.

The anode losses electrons and make holes that hole move towards the emissive layer from the conductive layer.

After they reach, electrons and holes combine and get neutralized and produce light.

This process happened multiple times in one second, which produces colored light due to the placement of color filters after a glass or bottom layer.

Types of OLED

  1. Passive matrix OLED or (PMOLED)
  2. Active matrix OLED or (AMOLED)
  3. Transparent OLED or (TOLED)
  4. Foldable OLED or (FOLED)
  5. Top emitting OLED
  6. White OLED

OLED Features

  • They don’t need background light due to the emission of visible light.
  • The device is less thick than other screen types
  • In darkrooms, OLED provides high contrast ratio than the LCD
  • OLED had a very saturated and vivid color screen
  • They had the deepest black
  • Wide display


OLED advantages

  • Much improved screen quality
  • Flexible screen
  • Fuller viewing angle
  • Widest range of color combination
  • Faster operation
  • Low power consumption
  • Transparent display
  • Foldable display
  • Thinner screen
  • Large-sized screen
  • Operational stability
  • Less weight
  • Use wide energy gap of semiconductor material
  • Suitable for less power consumption devices
  • High screen color fidelity
  • High efficiency
  • Eco-friendly
  • High response time


OLED disadvantages

  • Highly expensive at the production
  • Less lifespan
  • Highly reactive against water
  • Limited market availability
  • Luminance degradation


OLED applications

  • High-end television sets
  • Smartphones
  • Wearable smart devices
  • Media player
  • Digital cameras
  • Gaming devices
  • Laptops and Computers
  • Fashion textile industry
  • Automobile application

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