Polymer composite P3HT:Eu3+ doped La2O3 nanoparticles as a down-converter material to improve the solar spectrum energy

Abstract Europium-doped La 2 O 3 nanocrystalline powders with sizes in the range of 50–200 nm have been obtained by the modified sol–gel Pechini method. These nanocrystals have been deagglomerated using sonication for 3 h and have been dispersed into a semiconductor P3HT polymeric matrix. We studied and analysed the spectroscopic properties of the trivalent europium in the hexagonal La 2 O 3 nanocrystals dispersed in the polymer. The luminescence spectrum of Eu 3+ in these nanocrystals is dominated by the 5 D 0 → 7 F 2 transition with a maximum intensity peak located at 626 nm. We observed that P3HT absorbs part of the light emitted by the nanoparticles. These properties look promising for using this material as a down-converter material in solar cells.