OLED is a special case of Light Emitting Diodes (LED). When the organic layers are used in fabricating LEDs, they are called OLEDs. Both technologies are widely used in modern displays. They help to reduce the power consumption in a greater scale compared to conventional CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display) screens.
LED (Light Emitting Diode)
LED is a type of diode, which can emit light when conducting. Since diode consists of two P-type and N-type inorganic semiconductor layers (ex: Si, Ge), both ‘electrons’ and ‘holes’ (positive current carriers) take part in conduction. Therefore, the ‘recombination’ process (a negative electrons joins a positive hole) happens, releasing some energy. LED is made in a way that, those energies are released in terms of photons (light particles) of preferred colors.
Therefore, LED is a light source, and it has many advantages such as energy efficiency, durability, smaller size etc. Currently environment friendly LED light sources have been developed, and they are used in modern displays.
OLED (Organic Light Emitting Diode)
OLEDs are made of layers of organic semiconductors. This organic layer is normally placed between the cathode and anode (OLED is also a 2 terminal semiconductor device like LED). The electron-hole recombination process causes the light emission. Normally there are two layers known as emissive layer and conductive layer. Emission of radiation happens at the emissive layer.
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What is the difference between LED and OLED? 1. OLEDs consist of organic materials and LEDs are made of inorganic semiconductors. 2. OLED is also a type of LED. 3. OLEDs displays are expected to be much less expensive in future. 4. OLEDs are said to be power efficient than normal LEDs.
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