Development of Single Molecular White Light Material Based on Rare Earth Europium Complexes

In this paper, a novel white light material CRP4-Eu was developed by introducing rare earth europium complex with excellent red light into coumarin derivative with blue light. Since rare earth europium complex is mainly dependent on the energy transfer of the ligand 2-thienoyltrifluoroacetone(TTA), with a Stokes shift up to 274 nm, the absorption spectrum of rare earth europium has almost no overlap with the fluorescence emission spectrum of coumarin derivative with blue light, so that red light and blue light can be emitted simultaneously, and finally white light can be realized. The effect of excitation wavelength and concentration of CRP4-Eu on the luminescence color was investigated. It was proved that the CIE(Commission Internationale de L'Eclairage) coordinate of CRP4-Eu was (0.33, 0.35) when the concentration of CRP4-Eu was 30 μmol•L-1 and the excitation wavelength was 392 nm, which was close to that of pure white light(0.33, 0.33). This provides a basis for the further development of single molecular white organic luminescent materials. © 2021, Science Press. All right reserved.