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Updated: May 24, 2026

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
Published on: November 15, 2016
CaMoO4:x%Yb3+: a novel near-infrared quantum-cutting phosphors via cooperative energy transfer
Xueqin Cao1, Li Li, Xiantao Wei
1Department of Physics, University of Science and Technology of China, Hefei, 230026, China.
Abstract:
An efficient near-infrared (NIR) dowmconversion (DC) has been demonstrated in the CaMoO4:Yb3+ phosphors. Very strong NIR emission around 998 nm from the 2F(7/2) --> 2F(5/2) transition of the Yb3+ has been observed under ultraviolet excitation. A similar broad excitation band due to the absorption of the host CaMoO4 has been recorded when the NIR emission of Yb3+ and the visible molybdate (MoO4(-2)) emission are monitored, which suggests an efficient energy transfer (ET) from the host to the Yb3+. The Yb3+ concentration-dependent luminescence properties and lifetimes of both the visible and NIR emissions have also been studied. The lifetime of the molybdate emission decreases rapidly with the increasing Yb3+ concentration, further verifying the efficient ET from the host to the Yb3+. Moreover, the low temperature measurements have also been carried out to investigate the ET mechanism in the phosphors. A cooperative energy transfer (CET) mechanism has been proposed to rationalize the DC effect. The newly studied CaMoO4:Yb3+ DC phosphors, which can convert the broadband emission of the MoO4(2-) into NIR emission of Yb3+ with a twofold increase in the photon number will have potential application in greatly enhancing the response of silicon-based solar cells with a relatively higher Yb3+ quenching concentration.
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