RGB - LED - Sensor

摘要

We have verified, that the combination of a standard RGB-LED with a matched phosphor material as sensing medium is suited as a low cost sensor system. The RGB-LED works simultaneously as exciting light source, luminescence detector and optical filter to seperate excitation and emission wavelengths. In our approach, we only used the blue and the red LED. The remaining green LED can in general be utilized for intensity measurements in colorimetric measurements or as an intensity reference. Further possibilities based on the luminescence decay are dual sensor applications [7], where different sensing materials with the same excitation wavelenght but different emission wavelenghts are applied.