It passes through two layers of organic molecules. Its all wrapped up in customer service from the time you order, to after service of your products. Large LED array designed for use as a street lamp. Perimeter Banner Solution. Today there is a myriad of applications for the LED. Matzen top and Bob Biard bottom worked on parametric amplifiers, this helped lay groundwork for the LED. How They Work. Light color is dependent on the materials used in the organic or polymer layers. Tokushima, Japan Photo: Tetsuo Tsutsui. Displays will have additional layers such as an active matrix TFT thin film transistor which control pixel regions. When the electrons join the holes light is emitted.