OLEDs Create Sheets of Bright White Light
Looks like the 130-year-old incandescent light bulb’s days are numbered, because OLEDs (organic light emitting diodes)—the same devices that light up screens in cellphones—are now able to emit brilliant white light when electric current is applied. They can be printed in thin sheets, and can turn walls, ceilings, furniture, or anything else into a light-emitting…