# 17-21-088

spectral external radiant efficiency of the fluorescent specimen

Q

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