FEATURE LIGHTING
Quantum-dot LEDs: the daylight of the future
Anita Chandran on the commercial potential of quantum lighting
M
any of us are familiar with the light-emitting diode (LED), a technology that now provides the most efficient lighting
option to date. LEDs in a diverse range of colours are widely used for lighting across application sectors. But over the course of the last 10 years, one prospective technology has threatened to rock the boat of LED lighting: the quantum-dot LED (QD-LED). QD-LEDs are based on quantum-dot
technology, comprised of quantum dots (QDs), semiconductor particles just a few
14 Electro Optics November 2022
nanometres in size. Because of their small domain, their behaviour is governed by quantum mechanics. By ‘exciting’ quantum dots using electrical currents or driving radiation, they can be induced to emit light, the colour of which is based on the size of the QD.
The QD-LED is already a leading player
in the field of display technology, with companies such as Samsung carrying commercial television ranges based on QD-LEDs. Competition is rife between microLEDs, organic LEDs (OLEDs) and
QD-LEDs when it comes to displays. The QD-LED has yet to conquer the lighting sector, and at present only one company offers a commercial QD-LED for lighting- based applications: Ams Osram. But recent developments in the technology have suggested the QD-LED may yet make big strides in the lighting industry.
Quantum advantage Most modern LEDs work using a blue LED backlight and a phosphor coating; phosphors are solid materials that emit
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