Publication date: 28th August 2024
Some materials emit two longer-wavelength photons following the absorption of one shorter-wavelength photon. This process is called quantum cutting, and constitutes color conversion with near 100% energy efficiency. Materials capable of this have prospects for enhancing solar cell efficiencies.
Quantum cutting has been claimed for various materials over the past two decades, but follow-up research often disproved initial claims. Typical techniques used to prove quantum cutting are time-resolved emission or transient absorption spectroscopy, which provide ambiguous results.
In this work, we show that the photon statistics of emitted light[1] can unambiguously reveal quantum cutting by a material. We have tested two materials, YPO4 co-doped with Tb3+ and Yb3+ and YAG co-doped with Ce3+ and Yb3+. Both are reported in the literature to perform quantum cutting via absorption of blue light followed by cooperative energy transfer to near-infrared-emitting Yb3+.[2,3] We find that YPO4:Tb3+, Yb3+ shows bunched emission, characteristic of quantum cutting. In contrast, YAG:Ce3+, Yb3+ shows regular Poissonian emission statistics. This reveals that YAG:Ce3+,Yb3+, despite various claims,[3,4] is not a quantum-cutting material.
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