Flexible organic light emitting diode (FOLED)

The flexible organic light-emitting diode or FOLED is a type of OLED technology, the name flexible organic LED suggests it is a bendable electronic technology. The main application based on flexible organic light-emitting diode or FOLED is the screens or displays.

Key points about flexible organic light emitting diode (FOLED)

  • The flexible OLED technology-based applications are mostly used for rollable displays, electronics paper, and the textile industry.
  • The construction of flexible technology with the transparent screen is a great technology to implement for wearing gadgets.
  • Efficiency for the organic material based device is higher
  • The contrast ratio for OLED based display is high

Construction of FOLED

Construction of FOLED
Construction of FOLED

 The flexible organic light-emitting diode that is made with thin flexible material, the basic construction of a FOLEDs is by placing a thin film layer of two different types of electroluminescent organic material between two conductors.

Substrate

It is a supportive layer for the OLEDs, it is made up of plastic, glass, and film metal.

Anode

This layer is used to remove electrons when a current is applied to it.

Organic layer

The organic layer is made with organic molecules or polymers.

Conducing layer 

It is a layer, which is made with organic plastic, it is used to send electrons from the anode.

Emission layer

It is the layer, which is made with organic plastic that is used to transport electrons from the cathode to make the light.

Cathode

The cathode works to inject electrons when a current is applied to it.

Working of FOLED

The basic working operation for flexible organic light-emitting diode or FOLED is when an electrical voltage is applied to the circuit.

The electrons and holes at the whole diode are injected into electroluminescent material and the electrons and holes recombined each other and energy is emitted as light.

Materials used on FOLED

  • Polymeric films
  • Stainless steel foils
  • Ultra-thin flexible glass

Advantages for flexible organic light-emitting diode

  • Each of the materials used to build FOLEDs is an organic layer, so it is compactable, thinner, and lighter in weight.
  • They consume very little power compare to other LED devices.
  • The operating voltages for FOLEDs are very low.
  • They produce low heat at its operation.

The disadvantage for flexible organic light-emitting diode

  • Currently, it is a very expensive technology to implement at electronics devices.
  • Direct contact with sunlight will make problems with FOLEDs.
  • Indium is an important and expensive material used on FOLEDs.
  • Contact with water is not suitable for its operation.   

Applications for flexible organic light-emitting diode

  • Flexible displays
  • Flexible lighting device
  • Electrophoretic displays
  • Packaging textiles
  • Medical device
  • Flexible sensor

 

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