IEVref:845-21-088ID:
Language:enStatus: Standard
Term: spectral external radiant efficiency of the fluorescent specimen
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Symbol: Q
Definition: quotient of the total radiant flux of all wavelengths emitted by the fluorescent process for an excitation wavelength and the total radiant excitation power irradiating the fluorescent material

Note 1 to entry: This quantity is also measured in relative terms by comparison to the radiant flux reflected from the perfect reflecting diffuser identically irradiated and viewed for a given excitation wavelength.

Note 2 to entry: Fluorescence is understood to include both fluorescent and phosphorescent phenomena with time constants short enough to be ignored for the application.

Note 3 to entry: The spectral external radiant efficiency of the fluorescent specimen has unit one.


Publication date:2020-12
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