Abstract
The synergistic effect appeared due to the cooperative dual-wavelength excitation by near-infrared (NIR) and ultraviolet (UV) light in rare-earth doped nano-particles (NPs) is very important to improve solar cell efficiency. Herein, we studied the synergistic effect combined with the energy levels of Er3+ ions and the defect states in KLu2F7 NPs. The introduction of Ce3+ ions in KLu2F7:16%Yb3+, 2%Er3+ NPs results in significant improvement of synergistic effect by producing more vacancy defects (VK′) which serves as shallow traps. We verify unambiguously that the control of the defects distribution exerts a facile approach to promote the synergistic effect with the assistance of Ce3+ ions doping.
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