Term: singlet-singlet energy transfer https://doi.org/10.1351/goldbook.S05698 Definition: Transfer of excitation from an electronically excited donor in a singlet state to produce an electronically excited acceptor in a singlet state. Related Terms: 1) singlet state (http://doi.org/10.1351/goldbook.S05699). 2) electron exchange excitation transfer (http://doi.org/10.1351/goldbook.E01993). 3) förster excitation transfer (http://doi.org/10.1351/goldbook.F02488). 4) radiative energy transfer (http://doi.org/10.1351/goldbook.R05063). Source: PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2273 (https://doi.org/10.1351/pac199668122223) Citation: 'singlet-singlet energy transfer' 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.S05698 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.