Multifunctional ammonium salts synergizing etching and passivation capability enable efficient deep-blue CsPbBr nanoplates
Two-dimensional CsPbBr 3 nanoplates (NPLs) are highly promising blue emitters due to their precisely tunable emission wavelength by adjusting the thickness. However, synthesizing high-performance deep-blue emissive CsPbBr 3 NPLs with fewer monolayers remains challenging. Here, multifunctional ligand...
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| Published in | Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 12; no. 23; pp. 832 - 838 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Published |
13.06.2024
|
| Online Access | Get full text |
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| Summary: | Two-dimensional CsPbBr
3
nanoplates (NPLs) are highly promising blue emitters due to their precisely tunable emission wavelength by adjusting the thickness. However, synthesizing high-performance deep-blue emissive CsPbBr
3
NPLs with fewer monolayers remains challenging. Here, multifunctional ligands of 2,6-diaminopyridinium hydrobromide (DaPyBr) with multiple coordination sites were designed and synthesized to attenuate the thickness of blue CsPbBr
3
NPLs and suppress surface defects. DaPyBr serving both as a Lewis acid and a Lewis base possesses the dual functions of etching and passivation. It can detach the outer defect layers of CsPbBr
3
NPLs reducing the thickness to 3 monolayers and passivate inner [PbBr
6
]
4−
layers suppressing the surface defects. Ultimately, CsPbBr
3
NPLs treated by DaPyBr achieved a near-unity photoluminescence quantum yield at 456 nm. The target NPLs gained long-term storage stability and outstanding resistance to polar solvents. A bright deep-blue pattern display with commendable luminescence stability is achieved
via
aerosol printing technology.
2,6-Diaminopyridinium hydrobromide has dual functions of etching and passivation. It can peel off the outer layers and simultaneously passivate the internal crystal structure, ultimately achieving high-performance deep blue CsPbBr
3
NPLs. |
|---|---|
| Bibliography: | 1 https://doi.org/10.1039/d4tc01261e PyBr-NPLs (b) and 2.25 mg ml 3 NPLs and different concentrations of DaPyBr; Fig. S8: NPLs of different DaPyBr concentration emission comparison under UV light; Fig. S9: TEM images and the selected-area particle size statistical analysis of the untreated NPLs (a), 1.25 mg ml PyBr-NPLs (c) with different resolution (100 nm, 50 nm and 20 nm); Fig. S10: distribution diagram of the length of the untreated NPLs and PyBr-NPLs with different concentrations; Fig. S11: comparison of XRD spectra of DaPyBr-NPL and PyBr-NPL with the same thickness (3MLs); Fig. S12: time-resolved photoluminescence of PyBr-NPLs with various concentrations; Fig. S13: the luminescence comparison after 45 days under UV light; Fig. S14: changes in fluorescence emission spectra with varying ethanol concentrations of control NPLs (a) PyBr-NPLs (b) DaPyBr-NPLs (c) after purification. See DOI Electronic supplementary information (ESI) available: Fig. S1: NMR (nuclear magnetic resonance) hydrogen spectrum of DaPyBr; Fig. S2: XPS spectrum of the untreated NPLs; Fig. S3: XPS spectrum of DaPyBr-NPLs; Fig. S4: (a), (c), (e) high-resolution XPS spectra of C 1 of control, PyBr-NPL and DaPyBr-NPL: (b), (d), (f) high-resolution XPS spectra of N 1 of control, PyBr-NPL and DaPyBr-NPL; Fig. S5: the selected regions for particle size statistical analysis and their corresponding data results for untreated NPLs and DaPyBr-NPLs with different concentrations; Fig. S6: distribution diagram of the length of the untreated NPLs and DaPyBr-NPLs with different concentrations; Fig. S7: XRD patterns of the untreated CsPbBr |
| ISSN: | 2050-7526 2050-7534 |
| DOI: | 10.1039/d4tc01261e |