METHOD AND DEVICE FOR MEASURING INTERNAL QUANTUM EFFICIENCY OF AN OPTICAL ELEMENT

摘要

A method for measuring the efficiency of an optical element is disclosed. The intensity of the light emitted from the optical element is measured by applying an injection current to the optical element, a relative radiative efficiency is calculated from a ratio of the intensity of the emitted light to the injection current, the maximum relative radiative efficiency and the maximum injection current corresponding to the maximum relative radiative efficiency are obtained, a reference injection current for minimizing an amount of change of a recombination coefficient in an active layer of the optical element in correspondence with a carrier density change in the active layer of the optical element is extracted from data of injection currents that are equal to or less than the maximum injection current and data of relative radiative efficiencies that are equal to or less than the maximum relative radiative efficiency, a reference internal quantum efficiency of the optical element is calculated from the reference injection current, and internal quantum efficiencies of the optical element in various injection currents are calculated from the reference internal quantum efficiency.

主权项

1. A method for measuring efficiency of an optical element, the method comprising:
measuring an intensity P of light emitted from an optical element by applying an injection current I to the optical element; calculating a relative radiative efficiency η from a ratio P/I of the intensity P of the emitted light to the injection current I; acquiring a maximum relative radiative efficiency and a maximum injection current corresponding to the maximum relative radiative efficiency; extracting a reference injection current Iref for minimizing an amount of change of a recombination coefficient in an active layer of the optical element with respect to a change of carrier concentration in the active layer of the optical element from data of injection currents equal to or less than the maximum injection current and data of relative radiative efficiencies equal to or less than the maximum relative radiative efficiency; calculating a reference internal quantum efficiency ηIQE,ref of the optical element in the reference injection current; and calculating internal quantum efficiencies ηIQE of the optical element in various injection currents from the reference internal quantum efficiency ηIQE,ref.