text: Just when lighting aficionados were in a dark place, LEDs came to the rescue. Over the past decade, LED technologies — short for light emitting diode — have swept the lighting industry by offering features such as durability, efficiency and long life.
  Now, Princeton engineering researchers have illuminated another path forward for LED technologies by refining the manufacturing of light sources made with crystalline substances known as perovskites, a more efficient and potentially lower-cost alternative to materials used in LEDs found on store shelves.
  The researchers developed a technique in which nanoscale perovskite particles self-assemble to produce more efficient, stable and durable perovskite-based LEDs. The advance, reported Jan. 16 in Nature Photonics, could speed the use of perovskite technologies in commercial applications such as lighting, lasers and television and computer screens.