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The quantum cutting phenomenon of a blue photon into two infrared photons is reported in glass codoped with Pr 3+ -Yb 3+  ions. Oxyfluoride glass with compositions of 32SrF 2 -0.1PrF 3 -2.9YbF 3 -42SiO 2 -23Al 2 O 3  were prepared, and photoluminescence properties in the range from visible to near-infrared were investigated. Evidence of several energy transfers, such as (Pr 3+ : 3 P 0 → 1 G 4 )→(Yb 3+ : 2 F 5/2 ← 2 F 7/2 ) and (Pr 3+ : 1 D 2 → 3 F 4 ,  3 F 3 )→(Yb 3+ : 2 F 5/2 ← 2 F 7/2 ), were demonstrated in the Pr 3+ -Yb 3+  co-doped glass. By comparing excitation spectrum of the Yb 3+  emission with absorption spectrum of Pr 3+ , we obtain direct evidence of quantum cutting by excitation to Pr 3+ : 3 P J  levels at 420 ~ 490 nm.

Spectroscopy and 1μm Luminescence by Visible Quantum Cutting in Pr3+-Yb3+ Codoped Glass