IUPAC - radiative energy transfer (R05063)

radiative energy transfer

also contains definition of: trivial energy transfer

https://doi.org/10.1351/goldbook.R05063

Transfer of excitation energy by radiative deactivation of a donor molecular entity and reabsorption of the emitted radiation by an acceptor molecular entity.

Notes:

Radiative transfer results in a decrease of the donor fluorescence intensity in the region of spectral overlap. Such a distortion of the fluorescence spectrum is called inner-filter effect.
Radiative energy transfer depends on the shape and size of the vessel utilized and on the configuration of the latter with respect to excitation and observation.
The fraction $a$ of photons emitted by D and absorbed by A is given by $a = \frac{1}{Φ_{D}^{0}} \int_{_{λ}} I_{λ}^{D} (λ) [1 - 10^{- ε_{A} (λ) c_{A} l}] d λ$ where $c_{A}$ is the molar concentration of acceptor, $Φ_{D}^{0}$ is the fluorescence quantum yield in the absence of acceptor, $l$ is the thickness of the sample, $I_{λ}^{D} (λ)$ and $ε_{A} (λ)$ are the spectral distribution of the spectral radiant intensity of the donor fluorescence and the molar decadic absorption coefficient of the acceptor, respectively, with the normalization condition $Φ_{D}^{0} = \int_{λ} I_{λ}^{D} (λ) d λ$ .
For relatively low absorbance, $a$ can be approximated by $a = \frac{2.3}{Φ_{D}^{0}} c_{A} l \int_{λ} I_{λ}^{D} (λ) ε_{A} (λ) d λ$ where the integral represents the overlap between the donor fluorescence spectrum and the acceptor absorption spectrum.

Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 411 [Terms] [Paper]

Citation: 'radiative 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.R05063 RIS BibTex EndNote

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radiative energy transfer