High-efficiency red photoluminescence achieved by antimony doping in organic-inorganic halide (CHN)[InBr][InBr]
Organic-inorganic metal halides (OIMHs) exhibit various crystal structures and strong broadband emission, showing enormous potential for solid-state lighting and displays. In this work, we report a new lead-free OIMH (C 11 H 24 N 2 ) 2 [InBr 6 ][InBr 4 ], which adopts a typical zero dimensional (0D)...
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| Published in | Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 1; no. 15; pp. 595 - 5913 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Published |
14.04.2022
|
| Online Access | Get full text |
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| Summary: | Organic-inorganic metal halides (OIMHs) exhibit various crystal structures and strong broadband emission, showing enormous potential for solid-state lighting and displays. In this work, we report a new lead-free OIMH (C
11
H
24
N
2
)
2
[InBr
6
][InBr
4
], which adopts a typical zero dimensional (0D) structure with the inorganic polyhedra separated by the large organic cations. Different from the general 0D In-based OIMHs with single octahedral [InBr
6
]
3−
units, (C
11
H
24
N
2
)
2
[InBr
6
][InBr
4
] contains both [InBr
6
]
3−
octahedra and [InBr
4
]
−
tetrahedra. It shows a large optical bandgap of 3.95 eV and excellent ambient stability. In addition, Sb dopants can be included in the structure, and an obvious preference for substituting the In atoms in the [InBr
6
]
3−
octahedra has been determined by analyzing the related bond lengths and polyhedral distortion. (C
11
H
24
N
2
)
2
[InBr
6
][InBr
4
] exhibits a broadband red emission (660 nm) that is ascribed to self-trapped excitons (STEs) in octahedral [InBr
6
]
3−
, and the photoluminescence quantum yield (PLQY) can be significantly enhanced from 8% to 61% upon Sb doping, mainly as a result of the extra photo-induced excitons from [SbBr
6
]
3−
. Density functional calculations reveal the direct bandgap nature of (C
11
H
24
N
2
)
2
[InBr
6
][InBr
4
], which is transferred to an indirect band gap after Sb doping due to the formation of the intra-gap band. A white light-emitting diode (WLED) was fabricated by combining the red emissive (C
11
H
24
N
2
)
2
[InBr
6
][InBr
4
]:Sb
3+
and commercial green and blue phosphors, exhibiting a high color-rendering index of 88.7. Our work reports high-efficiency red photoluminescence (PL) in this special 0D double-inorganic-unit system, and demonstrates its potential applications for solid-state lighting.
We report a new 0D lead-free halide with both [InBr
6
]
3−
octahedra and [InBr
4
]
−
tetrahedra as inorganic units. High-efficiency red photoluminescence can be achieved
via
Sb doping in this emissive material with a PLQY of 61%. |
|---|---|
| Bibliography: | 11 2131568 24 and Sb-doped samples (Tables S1-S11). PXRD pattern, Tauc plot of (C 2131116 2131567 PLQY experimental data and structure model used for calculation (Fig. S1-S7). CCDC H ) , 2131565 N Sb 10.1039/d2tc00355d For ESI and crystallographic data in CIF or other electronic format see DOI 2 4 6 and InBr PLE and PL spectra of 1-(cyclohexylmethyl)piperazine at room temperature, normalized PLE and PL spectra, integral PL intensity, and time-resolved decay curves of (C 3+ Electronic supplementary information (ESI) available: Crystal data, atomic coordinates, displacement parameters, anisotropic displacement parameters, and distortion degree of (C |
| ISSN: | 2050-7526 2050-7534 |
| DOI: | 10.1039/d2tc00355d |