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Enhancing Exciton Binding Energy and Photoluminescence of Formamidinium Lead Bromide by Reducing Dimension into 2D Nanoplates for Efficient Light Emitting Diodes

Abstract

Formamidinium lead bromide perovskite nanocrystals (FAPbBr3 PNCs) are extremely promising for applications in green light emitting diodes (LEDs) since their photoluminescence maxima locate in the range of 530-535 nm with a narrow full width at half-maxima (< 25 nm). However, the low exciton binding energy (EB) of FAPbBr3 (∼25 meV) hinder the development in LEDs. In the study, we have developed a 2-methyl-1-pentanol assisted hot injection method for synthesis of 2D FAPbBr3 nanoplates with high stability. Due to strong quantum confinement in two dimensions of nanoplates, the obtained FAPbBr3 nanoplates exhibited a high EB of 168.4 meV. The high EB dramatically enhanced the photoluminescence (PL) properties that with a high fluorescence quantum yield of 92%, which realizes a fast photoluminescence lifetime of 2 ns with negligible trapping processes. Benefit from high EB and outstanding PL properties, the FAPbBr3 nanoplates LED device showed a current efficiency of 17.32 cd A-1 at a low voltage of 4 V, and corresponding external quantum efficiency (EQE) up to 4.5% with Commission Internationale de L'Eclairage (CIE) 1931 color coordinates of (0.24, 0.73), providing a new pathway for the fabrication efficient perovskites based LED device.

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Publication details

The article was received on 20 Jun 2018, accepted on 09 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR04986F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Enhancing Exciton Binding Energy and Photoluminescence of Formamidinium Lead Bromide by Reducing Dimension into 2D Nanoplates for Efficient Light Emitting Diodes

    X. Chen, F. Li, L. Yang, Z. Cai, K. Wei, F. Lin, J. You, T. Jiang and Y. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04986F

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