Near-Infrared Quantum Cutting via Downconversion Energy Transfers in Ho~(3+)/Yb~(3+) Codoped Tellurite Glass Ceramics

摘要

The different concentration of Ho~(3+) /Yb~(3+) codoped tellurite glasses were prepared by high-temperature melting-quenching method. On excitation of Ho~(3+) ions with blue photon at 449 nm as well as ultraviolet (UV) photon at 360 nm, the near infrared emission at 977 nm from Yb~(3+) and 981, 1020 nm from Ho~(3+), which could be absorbed by silicon and enhance the efficiency of the silicon-based solar cell, were observed. The energy-transfer process of Ho~(3+) and Yb~(3+) ions and involved mechanism have been investigated and discussed. The first-order energy transfer (ET) through cross relaxation and a back ET from Yb~(3+) to Ho~(3+) occurred in the near-infrared quantum cutting (NIR QC) system are proposed and verified. The NIR quantum efficiency achieved 166% when Yb~(3+) doping concentration is 20 mol%.