LEDs were first developed in the early 20th Century, and the first practical, commercial LEDs were brought to the market in the 1960s. However, the earliest LEDs were red or orange. The development of blue LEDs was crucial to the ability to make “white light” LEDs, which combine blue, green, and red (or sometimes blue and yellow) to create an acceptable light source for general illumination. The high efficiency of LED light bulbs and LED displays which we enjoy today stems from this research work.
As the Nobel committee noted, “As about one fourth of world electricity consumption is used for lighting purposes, the LEDs contribute to saving the Earth’s resources.” With the increased use of LEDs for lighting, demand for electricity is reduced. We salute these three as EcoGeeks of the highest order.