Luminescent
spectral conversion, including down-conversion (DC) and down-shifting
(DS) is a potential route to overcome the spectral mismatch between
solar photons and the semiconductor energy gap. Here, we introduce
metal organic frameworks (MOFs) that integrate DC and DS processes
into one system. Three different MOFs (Gd(BTC)(1), Gd(BPT)(2), and Gd(OBT)(3)) were synthesized doped with
lanthanide ions couples. The DS–DC synergistic fluorescent
processes were observed in all the MOFs. The overall absorption and
near-infrared (NIR) emission intensity are dramatically enhanced (by
factors of ∼4 800 and 550) due to the DS-sensitized effect
for DC. As for DS process, the DC-bridge effect is quantified for
the first time by comparing the NIR quantum yield (QYNIR). Benefiting from the bridge effect, QYNIR (5.30%) of Dy0.01Yb0.10-3 is increased around 3 times greater than the
system without DC process, and it is close to the highest value reported
for the C–H bond containing Yb3+ emitter. Our study
demonstrated that MOFs can be regarded as easily prepared, environmentally
friendly and efficient spectral conversion materials to improve the
photon-response for c-Si solar cells.
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