Multiligand Europium Complexes Incorporated Polyvinylpyrrolidone for Enhanced Solar Cell

Abstract

Intense reddish-orange fluorescence of Eu ³⁺ is observed in multiligand europium complexes Eu(BA)(TTA) ₂ and Eu(BA)(TTA) ₂Phen doped polyvinylpyrrolidone (PVP). Under 367 nm UVA-LED pumping with 708.5 μW, the net emission powers are as high as 204.8 and 243.2 μW, and the total emission photon numbers are derived to be 635.9 × 10 ¹² and 754.9 × 10 ¹² cps for Eu(BA)(TTA) ₂ and Eu(BA)(TTA) ₂Phen doped PVP thin films, respectively. It is incredible that the quantum yield (QY) is up to 57.87% in the former; furthermore, as the introduction of Phen, the QY of Eu ³⁺ is increased to 62.03%, verifying the effectiveness of multiligands in photon conversion. Conclusive photon quantification and efficient fluorescence emission reveal the potential of europium complexes/PVP as UV-visible conversion layers for enhanced solar cells.