Efficient Deep-Blue Light-Emitting 2D (100)-Oriented Perovskites and Spectral Broadening by Exciton Self-Trapping for White-light Emissions

Xuerui Chang, Yufan Lin, Xiaohua Cheng, Ying Han, Li Cong, Longyun Lv, Yuxin Jia, Juan Li*, Jun Yin*, Bin Bin Cui*

*Corresponding author for this work

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Abstract

Efficient narrow deep-blue and broadband emissions in layered 2D organic–inorganic hybrid metal halide perovskites (MHPs) are attracting more attention and need further study. In this work, two (100)-oriented 2D organic-inorganic hybrid MHPs of (TFI)2PbBr4 and (TFI)2PbCl4·H2O (TFI = 4-(trifluoromethyl)-1H-imidazole) with efficient deep-blue and bluish-white emissions are synthesized and the photoluminescence quantum yields (PLQYs) reached up to 81.21% and 20.23%, respectively. As both intrinsic lattice distortions of two crystals with similar crystal structure are almost negligible, they have theoretical deep-blue emissions empirically. However, the halogen substitution of chlorine (Cl) by bromine (Br) broadened the deep-blue photoluminescence to a bluish-white area. Here, the spectral broadening phenomenon is discussed in detail. The (TFI)2PbBr4 film shows a narrow emission with a 16 nm full width at half maximum (FWHM) peaking at 435 nm upon excitation, and an ultraviolet-pumped light-emitting diode (LED) prepared by bluish-white (TFI)2PbCl4·H2O phosphor shows a color rendering index (CRI) of ≈93 and a related color temperature (CCT) of 4162K, indicating their potential applications in deep-blue and white LEDs, respectively.

Original languageEnglish
Article number2302211
JournalAdvanced Optical Materials
Volume12
Issue number10
DOIs
Publication statusPublished - 4 Apr 2024

Keywords

  • hybrid perovskite
  • self-trapping exciton
  • white-light emissions
  • “electron-phonon” coupling

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Chang, X., Lin, Y., Cheng, X., Han, Y., Cong, L., Lv, L., Jia, Y., Li, J., Yin, J., & Cui, B. B. (2024). Efficient Deep-Blue Light-Emitting 2D (100)-Oriented Perovskites and Spectral Broadening by Exciton Self-Trapping for White-light Emissions. Advanced Optical Materials, 12(10), Article 2302211. https://doi.org/10.1002/adom.202302211