Time-Dependent Density Functional Theory in Photophysical Characterization

Time-Dependent Density Functional Theory (TDDFT) has become the principal computational framework for exploring the electronic excited states of molecular systems with a balance of accuracy and efficiency. By extending ground-state Density Functional Theory through the time-dependent Kohn–Sham formalism, TDDFT enables reliable prediction of absorption and emission spectra, singlet-triplet energy gaps, spin-orbit coupling strengths and radiative lifetimes. Such capabilities underpin rational design of advanced photonic materials, from photosensitizers in photodynamic therapy to light-harvesting units in solar cells and fluorescent probes for bioimaging. TDDFT studies guide chemical modification strategies—whether through heteroatom substitution, donor–acceptor scaffolds or bridging-group optimisation—to fine-tune excited-state localisation, intersystem crossing rates and quantum yields, thereby accelerating the development of high-performance chromophores and functional dyes.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Time-Dependent Density Functional Theory in Photophysical Characterization publication trend

The graph below shows the total number of articles in time-dependent density functional theory in photophysical characterization across all publications each year (not limited to Nature Index journals).

Technical terms

Time-Dependent Density Functional Theory (TDDFT): A quantum-chemical method that extends ground-state DFT to model electronic excitations by solving the time-dependent Kohn–Sham equations, facilitating spectra and excited-state property predictions.

Singlet-triplet energy gap: The energy difference between the lowest singlet and triplet electronic states, which governs intersystem crossing rates and triplet-state yields in photophysical processes.

Spin-orbit coupling: An interaction between a particle’s spin and its orbital motion that enables mixing of spin states, crucial for facilitating intersystem crossing and phosphorescence.

Intersystem crossing (ISC): A non-radiative transition between electronic states of different spin multiplicity (singlet to triplet or vice versa), often enhanced by spin-orbit coupling to populate long-lived triplet states.

References

1. Sulphur- and Selenium-for-Oxygen Replacement as a Strategy to Obtain Dual Type I/Type II Photosensitizers for Photodynamic Therapy. Molecules (2023).
2. Porphyrin photosensitizer molecules as effective medicine candidates for photodynamic therapy: electronic structure information aided design. RSC Advances (2024).
3. Controlling Excited State Localization in Bichromophoric Photosensitizers via the Bridging Group. Inorganic Chemistry (2024).