Up to 3.5-fold enhancement in the upconversion (UC) luminescence of activators (Tm3+ and Er3+) in an UC nanocrystal is observed when the sensitisers (Nd3+ and Yb3+) are simultaneously excited. This is due to a coooperative harvested energy transfer to the activators from both direct and indirect-excited Yb3+.
E. Yeow and M. D. Lee, Chem. Commun., 2025, Accepted Manuscript , DOI: 10.1039/D5CC03356J
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