dual fluorescence 

of systems or molecular species
https://doi.org/10.1351/goldbook.DT07365
Systems or molecular species showing two fluorescence bands. Several non-trivial molecular properties may be at the basis of a dual fluorescence, such as conformational equilibrium in the ground state and a mixture of excited states.
Note:
Trivial reason for dual fluorescence is the coexistence of two independent fluorophores.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 327 [Terms] [Paper]
Citation: 'dual fluorescence' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.DT07365 RIS BibTex EndNote
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Last revised: February 24, 2014