Light-emitting diode
Videos
A light-emitting diode is an electronic component that uses a semiconductor to emit light when current flows through it. Electrons in the semiconductor recombine with electron holes, thereby releasing
Blue, green, and red LEDs in 5 mm diffused cases. There are many different variants of LEDs.
A bulb-shaped retrofit LED lamp with aluminum heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage
Blue LEDs
An RGB LED projecting red, green, and blue onto a surface
Quantum dot
Videos
Quantum dots or semiconductor nanocrystals are semiconductor particles a few nanometres in size with optical and electronic properties that differ from those of larger particles via quantum mechanical
Quantum dots with gradually stepping emission from violet to deep red
Atomic resolution scanning transmission electron microscopy image of an indium gallium arsenide (InGaAs) quantum dot buried in gallium arsenide (GaAs)
A device that produces visible light, through energy transfer from thin layers of quantum wells to crystals above the layers
Spin-cast quantum dot solar cell built by the Sargent Group at the University of Toronto. The metal disks on the front surface are the electrical connections to the layers below.