Abstract
Photo- and thermo-stable luminescent beads composed of Eu(hfa)3(TPPO)2 (hfa: hexafluoroacetylacetonate, TPPO: triphenylphosphine oxide) and PMMA (polymethylmethacryrate), Eu(hfa)3(TPPO)2-beads, have been reported for improvement of energy conversion efficiency on silicon solar cell. The photophysical properties of Eu(hfa)3(TPPO)2 and compared Eu(tta)3(TPPO)2 (tta: trifluoromethyl- thienylacetylacetonate) are characterized by the emission quantum yield, the emission lifetime, the radiative and the non-radiative rate constants. Photo- and thermo-stability of the beads with Eu(III) complexes in EVA (Ethylene Vinyl Acetate) are estimated under UV irradiation (Xenon lamp: 60W/m2) and highly temperature (120 °C). The stability of the Eu(hfa)3(TPPO)2-beads for industrial application was calculated to be ten years under air condition. Energy conversion efficiency of silicon solar cells attached EVA films with Eu(hfa)3(TPPO)2-beads increased approximately 2%(10%→10.2%) compared with EVA films contained with UV absorber. Photo- and thermo-stable Eu(hfa)3(TPPO)2-beads for silicon solar cells are demonstrated for the first time.
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