| quotient of the radiant flux of the radiation emitted by a photoluminescent material and the radiant flux of the radiation absorbed by that material Note 1 to entry: The term "photoluminescence radiant yield" is also used for the elementary process with a similar meaning, namely the quotient of the energy of the emitted photon and the energy of the absorbed photon which gave rise to it. Note 2 to entry: The photoluminescence radiant yield has unit one. Note 3 to entry: This entry was numbered 845-04-31 in IEC 60050-845:1987.
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