Defect Tolerant Quantum Cutting in Mechanosynthesized Ytterbium-Doped Cesium Lead Chloride Perovskites
Thiago I. Rubio, Claudia E. Avalos
TL;DR
This paper explores how doping cesium lead chloride perovskites with ytterbium can enhance photoluminescence, even with defects, using mechanosynthesis and NMR.
Contribution
The study identifies conditions for optimal quantum cutting in doped perovskites through mechanosynthesis and NMR analysis.
Findings
Higher ytterbium doping correlates with shorter NMR relaxation times due to paramagnetic effects.
Excess lead and chloride ions favor defect incorporation that enhances photoluminescent quantum yields.
Optimal PLQY occurs at 5% doping after 1-2 hours of grinding, with further grinding reducing performance.
Abstract
Ytterbium doped cesium lead halide materials exhibit a property known as quantum cutting which allows for greater than 100% photoluminescent quantum yields (PLQYs). The local atomic structure of the defects responsible for these properties and the effectiveness of the doping for producing the desired PLQYs is not readily discerned using techniques requiring long-range order. In this work we prepared 2.5, 5, 10, and 20% Yb3+ doped CsPbCl3 powders using mechanosynthesis under distinct stoichiometric ratio conditions and characterized the defect incorporation and its effects on local atomic disorder using solid-state nuclear magnetic resonance (SSNMR) spectroscopy. We then correlate our observations to the observed PLQYs for each of the prepared samples. All samples prepared were found to be in an orthorhombic phase and no lattice shrinking was observed upon increased Yb3+ doping. An…
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Taxonomy
TopicsPerovskite Materials and Applications · Luminescence Properties of Advanced Materials · Optical properties and cooling technologies in crystalline materials