A generic lanthanum doping strategy enabling efficient lead halide perovskite luminescence for backlights

Liu, Yongjie; Wang, Cheng; Chen, Guoyi; Wang, Shuxin; Yu, Zhiqiu; Wang, Ti; Ke, Weijun; Fang, Guojia

doi:10.1016/j.scib.2023.04.023

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Lanthanide perovskite metal oxides have been extensively studied for their unique crystal structure and excellent optical [ 1 ], acoustic [ 2 ], magnetic [ 3 ], and electrical [ 4 ] properties. Complex metal oxides with the perovskite structure exhibit greater stability and reliability in terms of high-temperature chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Growth and Orientation of LaFeO3 Epitaxial Films

Xian,

Zheng,

Tao

et al. 2024

Materials

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LaFeO3 thin films were successfully epitaxially grown on single-crystalline SrTiO3 substrates by the one-step hydrothermal method at a temperature of 320 °C in a 10 mol/L KOH aqueous solution using La(NO3)3 and Fe(NO3)3 as the raw materials. The growth of the films was consistent with the island growth mode. Scanning electronic microscopy, elemental mapping, and atomic force microscopy demonstrate that the LaFeO3 thin films cover the SrTiO3 substrate thoroughly. The film subjected to hydrothermal treatment for 4 h exhibits a relatively smooth surface, with an average surface roughness of 10.1 nm. X-ray diffraction in conventional Bragg–Brentano mode shows that the LaFeO3 thin films show the same out-of-plane orientation as that of the substrate (i.e., (001)LaFeO3||(001)SrTiO3). The in-plane orientation of the films was analyzed by φ-scanning, revealing that the orientational relationship is [001]LaFeO3||[001]SrTiO3. The ω-rocking curve indicates that the prepared LaFeO3 films are of high quality with no significant mosaic defects.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Growth and Orientation of LaFeO3 Epitaxial Films

Xian,

Zheng,

Tao

et al. 2024

Materials

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“…Lead halide hybrid materials have attracted tremendous attention in the field of solid-state lighting, attributable to their excellent photoelectric properties and structural tunability. − One classical and extensively studied paradigm is organic lead halide perovskite with the common formula of APbX 3 (A = organic cations, X = Cl – /Br – /I – ). − By altering the organic constituents of the hybrid materials, the corner-sharing inorganic PbX 6 octahedra units can be expanded to form one-dimensional chains, two-dimensional layers, and three-dimensional (3D) networks, resulting in significant adjustments to their optical properties. − Among them, the development of lead halide hybrids with stable and single-component broadband emission is a current research focus. − However, the majority of organic lead halide hybrids exhibit labile structures based on the weak electrostatic interactions between organic cations and inorganic framework. , Simultaneously, the hydrophilicity of most organic ions makes lead halide hybrids corroded by ambient moisture, leading to the dissociation or migration of inorganic structural units and restricting their applications. − To improve the stability of lead halide hybrids, a viable strategy is to substitute organic ions with Cs + or Rb + ions to form all-inorganic structures. , Nevertheless, this substitution inevitably sacrifices structural tunability, resulting in a limited luminous range and making it difficult to achieve broadband emission.…”

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confidence: 99%

Self-Trapped Exciton Emission Enhancement in 3D Cationic Lead Halide Hybrids Via Phase Transition Engineering

Sun,

Wu,

Wang

et al. 2024

J. Phys. Chem. Lett.

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Three-dimensional (3D) cationic lead halide hybrids constructed by organic ions and inorganic networks via coordination bonds are a promising material for solid-state lighting due to their exceptional environmental stability and broad-spectrum emission. Nevertheless, their fluorescence properties are hindered by the limited lattice distortion from extensive connectivity within the inorganic network. Here, a dramatic 100-fold enhancement of self-trapped exciton (STE) emission is achieved in 3D hybrid material [Pb 2 Br 2 ][O 2 C-(CH 2 ) 4 CO 2 ] via pressure-triggered phase transition. Notably, pressure-treated material exhibits a 110 nm redshift with 1.5-fold enhancement compared to the initial state after pressure was completely released. The irreversible structural phase transition intensifies the [PbBr 3 O 3 ] octahedral distortion, which is highly responsible for the optimization of quenched emission. These findings present a promising strategy for improving the optical properties of 3D halide hybrids with relatively high stability and thus facilitate their practical applications by pressure-driven phase transition engineering.

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Unveiling the Effect of Cooling Rate on Grown‐in Defects Concentration in Polycrystalline Perovskite Films for Solar Cells with Improved Stability

Yin,

Chen,

Xie

et al. 2024

Advanced Materials

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Numerous efforts are devoted to reducing the defects at perovskite surface and/or grain boundary; however, the grown‐in defects inside grain is rarely studied. Here, the influence of cooling rate on the point defects concentration in polycrystalline perovskite film during heat treatment processing is investigated. With the combination of theoretical and experimental studies, this work reveals that the supersaturated point defects in perovskite films generate during the cooling process and its concentration improves as the cooling rate increases. The supersaturated point defects can be minimized through slowing the cooling rate. As a result, the optimized FAPbI3 polycrystalline films achieve a superior carrier lifetime of up to 12.6 µs and improved stability. The champion device delivers a 25.47% PCE (certified 24.7%) and retain 90% of their initial value after >1100 h of operation at the maximum power point. These results provide a fundamental understanding of the mechanisms of grown‐in defects formation in polycrystalline perovskite film.

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A generic lanthanum doping strategy enabling efficient lead halide perovskite luminescence for backlights

Cited by 6 publications

References 41 publications

Hydrothermal Growth and Orientation of LaFeO3 Epitaxial Films

Hydrothermal Growth and Orientation of LaFeO3 Epitaxial Films

Self-Trapped Exciton Emission Enhancement in 3D Cationic Lead Halide Hybrids Via Phase Transition Engineering

Unveiling the Effect of Cooling Rate on Grown‐in Defects Concentration in Polycrystalline Perovskite Films for Solar Cells with Improved Stability

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