Abstract
Abstract— Efficient near‐infrared (NIR) quantum cutting (QC) through cooperative downconversion in Y3Al5O12 : RE3+,Yb3+ (RE = Tb, Tm, and Pr) nanophosphors has been demonstrated, which involves the conversion of the visible photon from RE3+ into the NIR emission of Yb3+ with the optimal quantum efficiency approaching 200%. The authors have analyzed the measured luminescence spectra and decay lifetimes and propose a mechanism to rationalize the NIR QC effect. The results indicate the potential of developing RE3+‐Yb3 dual‐ion‐based nanophosphors for the downconversion of high‐energy photons to multiple photons with an energy greater than the bandgap of silicon‐based‐photonics display devices.
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