fabrication-white-light-emitting-electrochemical-cells-with-stable

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes

The authors present an approach for fabricating stable white light emission from polymer light-emitting electrochemical cells (PLECs) having an active ...

Waseda University

Using time-dependent density functional theory (TD-DFT), configuration interaction single (CIS) method, and approximate coupled cluster singles and doubles (CC2) method, we investigated the absorption spectra of coumarin derivative dyes (C343, NKX-2388, NKX-2311, NKX-2586, and NKX-2677), which have been synthesized for efficient dye-sensitized solar cells. The CC2 calculations are found in good agreement with the experimental results except for the smallest coumarin dye (C343). TD-DFT underestimates the vertical excitation energy of the larger coumarin dyes (NKX-2586 and -2677). Solvents (methanol) are found to induce a red shift of the vertical excitation energies, and their effects on the molecular geometry and the electronic structure are examined in detail. The deprotonated form of coumarin is also investigated, where a blue shift of the vertical excitation energies is observed.

Article	Year
Theoretical investigation of the excited states of coumarin dyes for dye-sensitized solar cells. The journal of physical chemistry. A\| PubMed ID: 17539619	2007
Triarylamine-functionalized ruthenium dyes for efficient dye-sensitized solar cells. ChemSusChem\| PubMed ID: 18972508	2008

Yoshinori Nishikitani

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