Patent ID: 8415639

Claim:
A quantum efficiency measurement method comprising the steps of: disposing a sample at a predetermined position in an integrator having an integrating space; applying excitation light to said sample disposed at said predetermined position, through a first window provided at said integrator, and measuring a spectrum in said integrating space as a first spectrum, through a second window provided at a position of said integrator, the position of said integrator not being crossed by an optical axis of said excitation light; configuring an excitation light incident portion located opposite to said first window and crossed by the optical axis of said excitation light in said integrator, so that excitation light after having passed through said sample is not reflected in said integrating space; applying said excitation light to said sample disposed at said predetermined position through said first window and measuring a spectrum in said integrating space as a second spectrum through said second window, under a state where the excitation light is not reflected in said integrating space; and calculating a quantum efficiency of said sample based on a component constituting a part of said first spectrum and corresponding to a wavelength range of said excitation light, and a component constituting a part of said second spectrum and corresponding to a wavelength range of light generated by said sample from said excitation light received by said sample.