Patent ID: 8462337

Claim:
A spectroscopic measurement apparatus comprising: an integrating sphere in which a sample as a measurement object is located, and having an entrance aperture for inputting excitation light with which the sample is irradiated, and an exit aperture for outputting light to be measured from the sample; spectroscopic means dispersing the light to be measured output from the exit aperture of the integrating sphere and obtaining a wavelength spectrum; and data analyzing means performing data analysis of the wavelength spectrum obtained by the spectroscopic means, the data analyzing means including: object range setting means setting, of an entire measurement wavelength range in the wavelength spectrum, a first object range corresponding to the excitation light and a second object range which is a wavelength range corresponding to light emission from the sample and different from the first object range; and sample information analyzing means determining a luminescence quantum yield of the sample by analyzing the wavelength spectrum in a wavelength range including the first object range and the second object range, wherein the sample information analyzing means, when a measured intensity in the first object range obtained in a reference measurement of performing a measurement by supplying the excitation light to the interior of the integrating sphere without the sample is set to I R1 , and a measured intensity in the second object range, to I R2 , and a measured intensity in the entire measurement wavelength range, to I R0 , and a measured intensity in the first object range obtained in a sample measurement of performing a measurement by supplying the excitation light to the interior of the integrating sphere with the sample is set to I S1 , and a measured intensity in the second object range, to I S2 , and a measured intensity in the entire measurement wavelength range, to I S0 , determines a measurement value Φ 0 of the luminescence quantum yield by: Φ=( I S2 −I R2 )/( I R1 −I S1 ), defines factors β, γ regarding stray light in the reference measurement as: β= I R1 /I Ro γ= I R2 /I R0 , and determines an analysis value Φ of the luminescence quantum yield by: Φ=βΦ 0 +γ.