Opto Diode Corporation, an ITW subsidiary and a member of the ITW Photonics Group, was established in 1981 with the objective to supply the highest output infrared LEDs (IRLEDs) in the world. We have expanded to offer high-performance, high-power visible light-emitting diodes, LED arrays, silicon (Si) photodiodes, opto-mechanical assemblies, and customized solutions. Our advanced technology IRD semiconductor radiation devices detect energy with an unprecedented 100 % internal quantum efficiency, operating in the UV, the extreme UV, X-ray, and electrons.