Broad Orange Emission from Piperazine-Based Layered Halide Perovskites

The excellent optoelectronic properties of layered halide perovskites make them ideal for devices such as solar cells, light-emitting diodes, and photodetectors. In this study, we report five two-dimensional (2D) halide perovskites: (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>)PbBr<sub>4</sub>, (C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbBr<sub>4</sub>·H<sub>2</sub>O, (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>)PbI<sub>4</sub>, 1-(C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbI<sub>4</sub>, and 2-(C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbI<sub>4</sub>, (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub> = <i>N</i>-Ethylpiperazine, C<sub>8</sub>H<sub>18</sub>N<sub>2</sub> = 1-Butylpiperazine). The optical band gaps of these compounds range from 2.63 to 3.35 eV. (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>)PbBr<sub>4</sub> exhibits broad orange emission with a peak at 624 nm, a full width at half-maximum (fwhm) of 246.8 nm, and a Stokes shift of 237 nm. In contrast, (C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbBr<sub>4</sub>·H<sub>2</sub>O shows a peak at 640 nm, fwhm of 262.8 nm, and a larger Stokes shift of 286 nm, attributed to exciton self-trapping induced by strong electron-phonon coupling and structural distortions. This significant Stokes shift is a notable feature of 2D materials. Our findings expand the database of layered halide perovskites, providing valuable insights for the development of next-generation optoelectronic technologies.

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Publication Details

Journal
Inorganic Chemistry
Published
2025-05-06
DOI
https://doi.org/10.1021/acs.inorgchem.5c01472
Primary Topic
Perovskite Materials and Applications
Type
article
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article

Broad Orange Emission from Piperazine-Based Layered Halide Perovskites

Dongfang Zhao, Ruibin Hao, Lingyu Chi, Quanlin Liu et al.
Inorganic Chemistry
Perovskite Materials and Applications
article

Broad Orange Emission from Piperazine-Based Layered Halide Perovskites

Dongfang Zhao, Ruibin Hao, Lingyu Chi, Quanlin Liu, Hongli Yu, Jing Zhao, Yibo Cui, D. Jia
article en

Abstract

The excellent optoelectronic properties of layered halide perovskites make them ideal for devices such as solar cells, light-emitting diodes, and photodetectors. In this study, we report five two-dimensional (2D) halide perovskites: (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>)PbBr<sub>4</sub>, (C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbBr<sub>4</sub>·H<sub>2</sub>O, (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>)PbI<sub>4</sub>, 1-(C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbI<sub>4</sub>, and 2-(C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbI<sub>4</sub>, (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub> = <i>N</i>-Ethylpiperazine, C<sub>8</sub>H<sub>18</sub>N<sub>2</sub> = 1-Butylpiperazine). The optical band gaps of these compounds range from 2.63 to 3.35 eV. (C<sub>6</sub>H<sub>14</sub>N<sub>2</sub>)PbBr<sub>4</sub> exhibits broad orange emission with a peak at 624 nm, a full width at half-maximum (fwhm) of 246.8 nm, and a Stokes shift of 237 nm. In contrast, (C<sub>8</sub>H<sub>18</sub>N<sub>2</sub>)PbBr<sub>4</sub>·H<sub>2</sub>O shows a peak at 640 nm, fwhm of 262.8 nm, and a larger Stokes shift of 286 nm, attributed to exciton self-trapping induced by strong electron-phonon coupling and structural distortions. This significant Stokes shift is a notable feature of 2D materials. Our findings expand the database of layered halide perovskites, providing valuable insights for the development of next-generation optoelectronic technologies.

Inorganic ChemistryVol. 64(19)
Division of Materials Science and Engineering (AU), University of Science and Technology Beijing (CN)
Openalex Percentile: Top 92%
Perovskite Materials and Applications
DOISourceOpenAlex
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Broad Orange Emission from Piperazine-Based Layered Halide Perovskites — Dongfang Zhao, Ruibin Hao, et al. · Inorganic Chemistry (2025) | TGRS Research Map | TGRS