The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 2018
Filed:
Jul. 31, 2013
Etamax. Co., Ltd, Gyeonggi-do, KR;
ETAMAX.CO., LTD, , KR;
Abstract
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.