Journal
CHEMICAL SCIENCE
Volume 8, Issue 6, Pages 4497-4504Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sc01590a
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Funding
- Alfred P. Sloan Fellowship
- Stanford Terman and Gabilan Faculty Fellowships
- William S. Johnson Fellowship through the Stanford Chemistry Department
- NSF Graduate Research Fellowship [DGE-114747]
- Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Through structural and optical studies of a series of two-dimensional hybrid perovskites, we show that broadband emission upon near-ultraviolet excitation is common to (001) lead-bromide perovskites. Importantly, we find that the relative intensity of the broad emission correlates with increasing out-of-plane distortion of the Pb-(mu-Br)-Pb angle in the inorganic sheets. Temperature-and power-dependent photoluminescence data obtained on a representative (001) perovskite support an intrinsic origin to the broad emission from the bulk material, where photogenerated carriers cause excited-state lattice distortions mediated through electron-lattice coupling. In contrast, most inorganic phosphors contain extrinsic emissive dopants or emissive surface sites. The design rules established here could allow us to systematically optimize white-light emission from layered hybrid perovskites by fine-tuning the bulk crystal structure.
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