| quotient of the photon flux of the radiation emitted by a photoluminescent material and the photon flux of the exciting radiation absorbed by that material Note 1 to entry: See also "external photoluminescence quantum yield". Note 2 to entry: The photoluminescence quantum yield has unit one. Note 3 to entry: This entry was numbered 845-04-32 in IEC 60050-845:1987.
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