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Reaching 90% Photoluminescence Quantum Yield in One-Dimensional Metal Halide CNHPbBr by Pressure-Suppressed Nonradiative Loss. | LitMetric

AI Article Synopsis

  • Low-dimensional perovskite-related metal halides are a new class of materials that can emit light, but there's still limited understanding of their properties and how to improve them.
  • Researchers studied a specific one-dimensional hybrid metal halide, CNHPbBr, and found that applying pressure significantly increased its photoluminescence efficiency from 20% to over 90% at high pressures.
  • The increase in light emission was mainly due to pressure reducing nonradiative decay, allowing excitons to bind more strongly, which enhances the material's optical properties.

Article Abstract

Low-dimensional perovskite-related metal halides have emerged as a new class of light-emitting materials with tunable broadband emission from self-trapped excitons (STEs). Although various types of low-dimensional structures have been developed, fundamental understating of the structure-property relationships for this class of materials is still very limited, and further improvement of their optical properties remains greatly important. Here, we report a significant pressure-induced photoluminescence (PL) enhancement in a one-dimensional hybrid metal halide CNHPbBr, and the underlying mechanisms are investigated using in situ experimental characterization and first-principles calculations. Under a gigapascal pressure scale, the PL quantum yields (PLQYs) were quantitatively determined to show a dramatic increase from the initial value of 20% at ambient conditions to over 90% at 2.8 GPa. With in situ characterization of photophysical properties and theoretical analysis, we found that the PLQY enhancement was mainly attributed to the greatly suppressed nonradiative decay. Pressure can effectively tune the energy level of self-trapped states and increase the exciton binding energy, which leads to a larger Stokes shift. The resulting highly localized excitons with stronger binding reduce the probability for carrier scattering, to result in the significantly suppressed nonradiative decay. Our findings clearly show that the characteristics of STEs in low-dimensional metal halides can be well-tuned by external pressure, and enhanced optical properties can be achieved.

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Source
http://dx.doi.org/10.1021/jacs.0c07166DOI Listing

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