ODPL measurement is a method of photoluminescence measurement using an integrating sphere to obtain the ratio of the number of photons emitted from a sample to the number of photons of excitation light absorbed by the sample. Semiconductor crystals have a wavelength region where photon absorption and emission overlap. Some light emission cannot be observed due to light extraction efficiency and photon recycling in that region. Thesefore only EQE (emission external quantum efficiency) can be observed among emitted light. *Except when IQE is 100%.
The ODPL measurement system can calculate IQE instantly by combining the measured EQE with analysis taking into consideration the unobservable light.
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