Abstract
Near‐infrared (NIR) quantum cutting involving the emission of two NIR photons for each visible photon absorbed is realized from Eu2+/Yb3+ codoped chalcohalide glasses. Excitation, emission and decay spectra are measured to prove the occurrence of cooperative energy transfer (ET) from Eu2+ to Yb3+. The maximum ET efficiency obtained is as high as 85%. The ET from Eu2+ to Yb3+ is followed by dipole‐dipole interaction. The possible mechanism of ET is discussed.
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