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Issue 40, 2019
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Broadband white-light emission from supramolecular piperazinium-based lead halide perovskites linked by hydrogen bonds

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Abstract

We demonstrate white-light emission using lead halide perovskites: (pip)2PbBr6 (pip = piperazine), (pip)2Pb4Cl12, (1mpz)2PbBr6 (1mpz = 1-methylpiperazine), and (2,5-dmpz)0.5PbBr3·2((CH3)2SO) (2,5-dmpz = trans-2,5-dimethylpiperazine, abbreviated as (2,5-dmpz)0.5PbBr3), in which the inorganic frameworks were connected by piperazinium dications through hydrogen bonds, forming a three-dimensional supramolecular network. From single-crystal X-ray diffraction measurements and Raman spectroscopy, we identified the crystal structures and local environmental vibrational modes in the inorganic framework, finding that (pip)2PbBr6 crystallized in the centrosymmetric orthorhombic space group Pnnm, whereas (pip)2Pb4Cl12 crystallized in the trigonal/rhombohedral space group R3. The zero-dimensional (1mpz)2PbBr6 structure crystallized in the centrosymmetric monoclinic space group P2/n, whereas the [PbBr6]4− octahedron was separated by a 1-methylpiperazine dication. (2,5-dmpz)0.5PbBr3·2((CH3)2SO) contained half a cation, which was completed by inversion symmetry, along with two dimethyl sulfoxide solvent molecules that crystallized in the monoclinic space group P21/c. Among the perovskites, (2,5-dmpz)0.5PbBr3·2((CH3)2SO) exhibited the longest carrier lifetime (42 ns), the lowest band gap (2.34 eV), and the highest photoluminescence quantum yield (58.02%). This is because it forms a 1D corner-sharing structure and has localized electronic states near the conduction band minimum, which contributes to the high photoluminescence quantum yield and white-light emission.

Graphical abstract: Broadband white-light emission from supramolecular piperazinium-based lead halide perovskites linked by hydrogen bonds

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Publication details

The article was received on 27 Aug 2019, accepted on 16 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9DT03469B
Dalton Trans., 2019,48, 15074-15090

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    Broadband white-light emission from supramolecular piperazinium-based lead halide perovskites linked by hydrogen bonds

    M. Jung, K. C. Ko and W. R. Lee, Dalton Trans., 2019, 48, 15074
    DOI: 10.1039/C9DT03469B

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