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Nature materials v.17 no.6, 2018년, pp.550 - 556   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Electron–phonon interaction in efficient perovskite blue emitters

Gong, Xiwen (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Voznyy, Oleksandr (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Jain, Ankit (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Liu, Wenjia (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Sabatini, Randy (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Piontkowski, Zachary (Department of Chemistry, University of Rochester, Rochester, NY, USA ) ; Walters, Grant (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Bappi, Golam (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Nokhrin, Sergiy (Department of Chemistry, University of Toronto, Toronto, ON, Canada ) ; Bushuyev, Oleksandr (Department of Chemistry, University of Toronto, Toronto, ON, Canada ) ; Yuan, Mingjian (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada ) ; Comin, Riccardo (Department of Electri ) ; McCamant, David ; Kelley, Shana O. ; Sargent, Edward H. ;
  • 초록  

    Low-dimensional perovskites have—in view of their high radiative recombination rates—shown great promise in achieving high luminescence brightness and colour saturation. Here we investigate the effect of electron–phonon interactions on the luminescence of single crystals of two-dimensional perovskites, showing that reducing these interactions can lead to bright blue emission in two-dimensional perovskites. Resonance Raman spectra and deformation potential analysis show that strong electron–phonon interactions result in fast non-radiative decay, and that this lowers the photoluminescence quantum yield (PLQY). Neutron scattering, solid-state NMR measurements of spin–lattice relaxation, density functional theory simulations and experimental atomic displacement measurements reveal that molecular motion is slowest, and rigidity greatest, in the brightest emitter. By varying the molecular configuration of the ligands, we show that a PLQY up to 79% and linewidth of 20 nm can be reached by controlling crystal rigidity and electron–phonon interactions. Designing crystal structures with electron–phonon interactions in mind offers a previously underexplored avenue to improve optoelectronic materials' performance.


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