Organic semiconductor or "plastic" LEDs are important because they are much cheaper and easier to fabricate than existing inorganic LEDs (which can be made of compounds of gallium, arsenic, indium, and other inorganic materials). Some inorganic LEDs can convert 47% to 64% of incoming electricity into white light rather than waste heat, but are hindered by high costs.
Organic LEDs' greatest promise is not in lighting, but to replace liquid crystal display (LCD) technology in modern televisions and computer screens. Organic LEDs will be much cheaper, can be made on flexible materials, have a wider viewing angle and color range, and will be more energy efficient than LCDs
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