A new one-dimensional (1D) face-shared hybrid lead bromide of (2cepiH)PbBr3, which exhibits intrinsic broadband yellow-light emission with a quantum yield of 16.8% outperforming all previously reported 1D face-shared hybrid metal...
One-dimensional (1D) organic−inorganic hybrid lead halides with unique core−shell quantum wire structures and splendid photoluminescence properties have been considered one of the most promising high-efficiency broadband emitters. However, studies on the broadband emissions in 1D purely face-shared lead iodide hybrids are still rare so far. Herein, we report on a new 1D lead iodide hybrid, (2cepyH)PbI 3 (2cepy = 1-(2-chloroethyl)pyrrolidine), characterized with face-sharing PbI 6 octahedral chains. Upon UV photoexcitation, this material shows broadband yellow emissions originating from the self-trapped excitons associated with distorted Pb−I lattices on account of the strong exciton−phonon coupling, as proved by variable-temperature emission spectra. Moreover, experimental and calculated results reveal that (2cepyH)PbI 3 is an indirect bandgap semiconductor, the band structures of which are governed by inorganic parts. Our work represents the first broadband emitter based on a 1D face-shared lead iodide hybrid and opens a new way to obtain the novel broadband emission materials.
Zero-dimensional (0D) organic–inorganic hybrid
metal halides
have captured broad interest in the lighting and display fields because
of their unique electronic structures and splendid broadband emission
properties. However, the blue light-excitable broadband yellow emissions
have been rarely reported in 0D hybrid metal halides. Here, we design
a new 0D bismuth hybrid, (4cmpyH)2BiCl5 (1, 4cmpy = 4-(chloromethyl)pyridine), featuring isolated edge-sharing
bioctahedral [Bi2Cl10]4– dimers
surrounded by rigid, conjugated, and luminescent organic [4cmpyH]+ cations. This material is able to show intrinsic broadband
yellow emissions under blue light (468 nm) excitation with a long
lifetime of 22.33 μs and a photoluminescence (PL) quantum yield
of 5.56%. Solid-state UV–vis spectroscopy studies prove that
introducing organic π-conjugated groups into hybrid systems
leads to absorption in the visible light region, in favor of photoexcitation
by visible light. By comparing the PL data of 1 and the
organic template at room temperature and measuring variable-temperature
PL spectra of 1, the blue light-excited broadband emission
of 1 can be attributed to the synergistic emissions of
intramolecular π → π* and n → π* transitions
in the organic cations and triple self-trapped exciton (STE) states
centralized at the highly distorted Bi–Cl lattices. Moreover,
density functional theory calculations reveal a type-II band alignment
in 1 with an indirect band gap of 2.64 eV, which is together
determined by organic cations and inorganic bioctahedral units. To
the best of our knowledge, our work represents the first report on
the blue light-excitable STE emission in 0D Bi-based metal halides,
which will largely promote the rapid development of novel high-performance
yellow light-emitting materials.
Zero-dimensional (0D) organic-inorganic metal halide hybrids have aroused heightened academic concerns from the solid-state lighting field because of their abundant structural species and excellent photoluminescence properties. However, the synthesis of...
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