Method for measuring internal quantum efficiency and light extraction efficiency of LED

2011 
The invention, which belongs to the field of photoelectric test technology, discloses a method for measuring an internal quantum efficiency (IQE) and a light extraction efficiency (LEE) of an LED. According to the scheme provided in the invention, an LED optical power and a relation in which a spectrum changes with a current are measured; an IQE numerical value is obtained by nonlinear regressionnearby an extremum value of an external quantum efficiency (EQE) and a corresponding LEE is calculated according to a formula; because an LEE does not change with an injection current, the LEE under different injection currents is obtained; further, corresponding LED IQEs under different injection currents are calculated and obtained by utilizing the LEE. The advantages of the method provided in the invention are as follows: routine measuring data are utilized to carry out an analysis, so that the method is simple with high operationality and a data result has high credibility; an IQE and an LEE of an LED tube core that is packaged or not packaged can be measured conveniently and the method can be used for analyzing influences of a chip structure and a packaging structure on LED efficiency; IQEs and LEEs of an LED under different currents can be measured.
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