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Chlorophyll and xanthophyll were extracted from different plants for use as sensitizer colorants; cells were sensitized using chlorophyll, xanthophyll and a mixture of the two pigments. It was found that energy conversion efficiency (η) and maximum output power (P max) were 15.16% and 8.31% higher than that achieved by the linear superposition of the cells sensitized by individual pigments. This indicates that the mixed pigment co-sensitization entails a synergistic effect in the energy transfer of the pigment-sensitized mesoporous TiO2 solar cells. Fluorescence analysis revealed that the electron transfer between chlorophyll and xanthophyll in the mixed pigment co-sensitized mesoporous TiO2 solar cells was similar to that in ‘zigzag chains’ of photosynthesis. [Copyright &y& Elsevier]

Abstract It is well-known that the thermal quenching (which is caused by non-radiative transition) damages the efficiencies of fluorescent lamps and LED lamps, especially for the high-power devices. Therefore, it is important to reduce the thermal quenching for improving the performance of illumination devices. In this work, Zn 3 (BO 3)(PO 4):Mn2+,Tb3+ is designed which appeared abnormal thermal quenching behavior. The phosphor does not exhibit thermal quenching even up to 200 °C (for emission of Mn2+) and 150 °C (for emission of Tb3+). The abnormal phenomenon is related to the shallow effects which are caused by the Mn2+ and Tb3+ doping in the host. Meanwhile, the thermal active phonon-assisted excitation also prevents the thermal quenching, which results in the broadening and blue-shift of the emission bands. Our result demonstrated that Zn 3 (BO 3)(PO 4):Mn2+, Tb3+ may be a potential candidate for the exploration of thermal stable materials. Graphical abstract Image 1 Highlights • Zn 3 (BO 3)(PO 4):Mn2+, Tb3+ was synthesized by solid state method. • An abnormal phenomenon is related to the defect of the host. • Thermal stability of phosphor was improved. [ABSTRACT FROM AUTHOR]