Phosphor Quantum Efficiency (QE)
The picture shows a system for determining the quantum efficiency of phosphor powder samples used in the lighting industry.
Up to 6 samples can be loaded into the motorised carousel. A calibrated Hg source, with closed loop controller for necessary stability, is used to excite the phosphors. Significantly, the temperature of each sample can be heated to 200oC ±1oC all under software control.
A carefully designed integrating sphere is used to collect all of the emitted light which is measured by a spectroradiometer system. Besides quantum efficiency of the phosphors and function of operating temperature, the system also provides full spectral emission and chromaticity data.