Affiliation:
1. Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering Southeast University Nanjing China
Abstract
AbstractThe near‐infrared (NIR) down‐conversion process for broadband sensitization has been studied in Eu2+‐Nd3+ co‐doped BaAl2O4. This material has a broad absorption band of 200–480 nm and can convert photons in the visible region into NIR photons. The NIR emission at 1064 nm, attributed to the Nd3+:4F3/2 → 4I11/2 transition, matches the bandgap of Si, allowing Si solar cells to utilize the solar spectrum better. The energy transfer (ET) process between Eu2+ and Nd3+ was demonstrated using photoluminescence spectra and luminescence decay curves, and Eu2+ may transfer energy to Nd3+ through the cooperative energy transfer (CET) to achieve the down‐conversion process. The energy transfer efficiency (ETE) and theoretical quantum efficiency (QE) were 68.61% and 156.34%, respectively, when 4 mol% Nd3+ was introduced. The results indicate that BaAl2O4:Eu2+‐Nd3+ can serve as a potential modulator of the solar spectrum and is expected to be applied to Si solar cells.