Stacked organic light emitting devices (SOLEDs produce full color light but take up less real estate on a chip than their planar counterparts which require 3 single-color pixels. In the inset figure, ITO stands for indium tin oxide, while TPD is the abbreviation for a layer of complex organic molecules which allow holes (the spaces vacated by electrons) to flow freely. Light comes out of both sides of the SOLED array since its outermost sub-units, which act as eletrodes, are transparent. The T in TOLED stands for transpaprent. (Figure courtesy of Paul Burrows, Princeton.) This research is reported by Paul Burrows at the meeting of the American Vacuum Society.