Sensitized triplet–triplet annihilation upconversion in water and its application to photochemical transformations

Abstract

The first systems for efficient upconversion-based technologies in water have been developed and pave the way for novel green photochemistry.

Multi‐Photon Excitation in Photoredox Catalysis: Concepts, Applications, Methods

“…TTA‐UC is very common in organic solvents but extremely rare in aqueous solution. Recently, we reported the first lab‐scale photoreduction based on TTA‐UC in neat water . Using [Ru(bpy) 3 ] 2+ in combination with anthracene‐9‐propionate (APA) and a green cw‐laser as the excitation source, trichloroacetate degradation was possible under aerobic conditions (Table , entry 4).…”

Optimizing photon upconversion by decoupling excimer formation and triplet triplet annihilation

“…Triplet-triplet annihilation photon upconversion (TTA-UC) can help light harvesting materials to overcome their bandgap limitation and thus achieve higher solar energy conversion efficiencies beyond the Shockley-Queisser limit. [1][2][3][4][5][6][7] The mechanism has recently been successfully incorporated in solar cells, [8][9][10][11][12][13][14] photocatalysts, [15][16][17][18] optical devices, [19][20][21][22][23][24] and light imaging. [25][26][27][28][29][30][31] It requires two functional species, a sensitizer and an annihilator.…”

Improved Photostability of a CuI Complex by Macrocyclization of the Phenanthroline Ligands

“…Emission spectra and kinetic emission traces with pulsed laser excitation (excitation wavelengths, 450 nm or 532 nm) were recorded with an LP920‐KS spectrometer from Edinburgh Instruments. A detailed description of that setup has been given previously . All solutions prepared for optical spectroscopy were deoxygenated with argon (4.8, PanGas).…”

“…A detailed description of that setup has been given previously. [43] All solutions prepared for optical spectroscopy were deoxygenated with argon (4.8, PanGas). Details concerning the photostability measurements are given in the Supporting Information.…”