Tunable White-Light Emission in Single-Cation-Templated Three-Layered 2D Perovskites (CH3CH2NH3)4Pb3Br10-xClx

Lingling Mao, Yilei Wu, Constantinos C. Stoumpos, Boubacar Traore, Claudine Katan, Jacky Even, Michael R Wasielewski, Mercouri G Kanatzidis

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Abstract

Two-dimensional (2D) hybrid halide perovskites come as a family (B)2(A)n-1PbnX3n+1 (B and A= cations; X= halide). These perovskites are promising semiconductors for solar cells and optoelectronic applications. Among the fascinating properties of these materials is white-light emission, which has been mostly observed in single-layered 2D lead bromide or chloride systems (n = 1), where the broad emission comes from the transient photoexcited states generated by self-trapped excitons (STEs) from structural distortion. Here we report a multilayered 2D perovskite (n = 3) exhibiting a tunable white-light emission. Ethylammonium (EA+) can stabilize the 2D perovskite structure in EA4Pb3Br10-xClx (x = 0, 2, 4, 6, 8, 9.5, and 10) with EA+ being both the A and B cations in this system. Because of the larger size of EA, these materials show a high distortion level in their inorganic structures, with EA4Pb3Cl10 having a much larger distortion than that of EA4Pb3Br10, which results in broadband white-light emission of EA4Pb3Cl10 in contrast to narrow blue emission of EA4Pb3Br10. The average lifetime of the series decreases gradually from the Cl end to the Br end, indicating that the larger distortion also prolongs the lifetime (more STE states). The band gap of EA4Pb3Br10-xClx ranges from 3.45 eV (x = 10) to 2.75 eV (x = 0), following Vegard's law. First-principles density functional theory calculations (DFT) show that both EA4Pb3Cl10 and EA4Pb3Br10 are direct band gap semiconductors. The color rendering index (CRI) of the series improves from 66 (EA4Pb3Cl10) to 83 (EA4Pb3Br0.5Cl9.5), displaying high tunability and versatility of the title compounds.

Original languageEnglish
Pages (from-to)11956-11963
Number of pages8
JournalJournal of the American Chemical Society
Volume139
Issue number34
DOIs
Publication statusPublished - Aug 30 2017

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Light emission
Cations
Semiconductors
Positive ions
Light
Excitons
Perovskite
Energy gap
Semiconductor materials
Color
Optoelectronic devices
Density functional theory
Solar cells
Lead
LDS 751
perovskite

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Tunable White-Light Emission in Single-Cation-Templated Three-Layered 2D Perovskites (CH3CH2NH3)4Pb3Br10-xClx. / Mao, Lingling; Wu, Yilei; Stoumpos, Constantinos C.; Traore, Boubacar; Katan, Claudine; Even, Jacky; Wasielewski, Michael R; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 139, No. 34, 30.08.2017, p. 11956-11963.

Research output: Contribution to journalArticle

Mao, Lingling ; Wu, Yilei ; Stoumpos, Constantinos C. ; Traore, Boubacar ; Katan, Claudine ; Even, Jacky ; Wasielewski, Michael R ; Kanatzidis, Mercouri G. / Tunable White-Light Emission in Single-Cation-Templated Three-Layered 2D Perovskites (CH3CH2NH3)4Pb3Br10-xClx. In: Journal of the American Chemical Society. 2017 ; Vol. 139, No. 34. pp. 11956-11963.
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abstract = "Two-dimensional (2D) hybrid halide perovskites come as a family (B)2(A)n-1PbnX3n+1 (B and A= cations; X= halide). These perovskites are promising semiconductors for solar cells and optoelectronic applications. Among the fascinating properties of these materials is white-light emission, which has been mostly observed in single-layered 2D lead bromide or chloride systems (n = 1), where the broad emission comes from the transient photoexcited states generated by self-trapped excitons (STEs) from structural distortion. Here we report a multilayered 2D perovskite (n = 3) exhibiting a tunable white-light emission. Ethylammonium (EA+) can stabilize the 2D perovskite structure in EA4Pb3Br10-xClx (x = 0, 2, 4, 6, 8, 9.5, and 10) with EA+ being both the A and B cations in this system. Because of the larger size of EA, these materials show a high distortion level in their inorganic structures, with EA4Pb3Cl10 having a much larger distortion than that of EA4Pb3Br10, which results in broadband white-light emission of EA4Pb3Cl10 in contrast to narrow blue emission of EA4Pb3Br10. The average lifetime of the series decreases gradually from the Cl end to the Br end, indicating that the larger distortion also prolongs the lifetime (more STE states). The band gap of EA4Pb3Br10-xClx ranges from 3.45 eV (x = 10) to 2.75 eV (x = 0), following Vegard's law. First-principles density functional theory calculations (DFT) show that both EA4Pb3Cl10 and EA4Pb3Br10 are direct band gap semiconductors. The color rendering index (CRI) of the series improves from 66 (EA4Pb3Cl10) to 83 (EA4Pb3Br0.5Cl9.5), displaying high tunability and versatility of the title compounds.",
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AU - Mao, Lingling

AU - Wu, Yilei

AU - Stoumpos, Constantinos C.

AU - Traore, Boubacar

AU - Katan, Claudine

AU - Even, Jacky

AU - Wasielewski, Michael R

AU - Kanatzidis, Mercouri G

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