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arXiv · 2606.31359

Photon Statistics from Yb3+-Doped CsPbCl3 are Inconsistent with Quantum Cutting

Vincent R. M. Benning·Faris Horani·Daniel R. Gamelin·Freddy T. Rabouw
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Abstract

CsPb(Cl1-xBrx)3:Yb3+ has been widely reported as a broadband quantum-cutting material with a photoluminescence quantum yield exceeding 100%, making it a promising candidate for enhancing the blue-green spectral response of silicon photovoltaics. Many groups have reproduced absolute photoluminescence quantum yields over 100%, but others have struggled to obtain such high values. Here, we test the quantum-cutting capabilities of CsPbCl3:Yb3+ nanocrystals and bulk material using photon-correlation analysis. A quantum-cutting material is expected to exhibit photon bunching, but our experiments on CsPbCl3:Yb3+ show no such behavior. In fact, we observe the opposite -- anti-bunching -- under focused-excitation conditions. This observation can be explained with the previously established Auger-quenching pathway in CsPbCl3:Yb3+. Our results thus confirm high-power Auger quenching but question earlier descriptions of quantum cutting in CsPb(Cl1-xBrx)3:Yb3+.

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Vincent R. M. Benning, Faris Horani, Daniel R. Gamelin, Freddy T. Rabouw. 2026-06-30. Photon Statistics from Yb3+-Doped CsPbCl3 are Inconsistent with Quantum Cutting. https://arxiv.org/abs/2606.31359

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