On the energy transfer in Bi2WO6: ERedOx-assisted radiative recombination in O2 and ROS sensing. prospective

Photoluminescence maximum emission signal of colloids based on Bi₂WO₆ suspended in an aqueous solution is blue-shifted as compared to its band gap according to E_{g +} (E_RedOx-E_CB). This process involves the exergonic non-radiative transfer of E_CB electron to E_RedOx and the concomitant radiative emission of a second electron that has gained E_RedOx-E_CB energy presumably by electrons energy levels entanglement induced via simultaneous light excitement of multiple electrons. These results constitute evidence for energy transfer with application in sensing electrolyte-electron-acceptors as reactive oxygen species that may be implemented for example in cancer and aortic dissection detection and treatment.

Graphical abstract

Bi₂WO₆ electrons from water colloidal solution are entangled by light (Plasmon resonance) and excited from the Bi₂WO₆ valence band (VB) to its conduction band (CB). Electron 1 moves up the gradient at the surface and is transferred to the acceptor (E_RedOx) at the electrolyte. The gained energy, E_RedOx—E_Cb, is transferred to electron 2 via their entangled energy levels. Electron 2 then decays to the VB emitting light at the Bi₂WO₆ band gap (E_g) plus the energy gained. Sensing of the E_RedOx and [RedOx] is then obtained.