Abstract
Downconversion of a single blue/green photon to two near-infrared photons offers a promising route to increase the efficiency of photovoltaic cells. Here we report on downconversion for the well-known upconversion couple (Er3+, Yb3+) doped into a host with low (∼200 cm−1) maximum phonon energy (KPb2Cl5). The intermediate energy level in
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