Abstract
Near infrared (NIR) emitting phosphor, LaCaAl3O7:Ce3+,Nd3+ was synthesized by one step combustion synthesis and characterized with scanning electron microscope, photoluminescence emission, photoluminescence excitation spectra and fluorescence decay measurements. When excited with UV, the phosphor gives broadband emission at 410nm, which corresponds to the allowed 5d→4f transition of Ce3+ ions and an intense NIR emissions in the range 800–1400nm, which are assigned to the characteristic transitions from 4I9/2,11/2,13/2 states of Nd3+ ions. The dependences of visible and NIR emissions, decay lifetime and the energy transfer efficiency (ηETE) on dopant concentrations were investigated in detail. The luminescence spectra, both in visible (VIS) and NIR regions, and decay curves of Ce3+ have been measured to prove energy transfer (ET) from Ce3+ to Nd3+. These results demonstrate the possibility for enhancing the photovoltaic conversion efficiency of c-Si solar cell by modifying the absorption and utilizing the UV part of the solar spectrum where the efficiency of c-Si solar cell is low.
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