Flexible green perovskite light emitting diodes

Cantarella, Giuseppe, Kumar, Sudhir, Vogt, Christian, Knobelspies, Stefan, Takabayashi, Alain, Jagielski, Jakub, Münzenrieder, Niko, Daus, Alwin, Petti, Luisa, Salvatore, Giovanni A, Lugli, Paolo, Shih, Chih-Jen and Tröster, Gerard (2019) Flexible green perovskite light emitting diodes. IEEE Journal of the Electron Devices Society. ISSN 2168-6734

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Abstract

Flexible perovskite light-emitting diodes (LEDs) have attracted increasing interest to realize ultrathin, light weight, highly conformable and nonfragile vivid displays. Solution-processed lead halide perovskite offers numerous distinctive characteristics such as pure emission color, tunable bandgaps, and low fabrication cost. In this work, green perovskite LEDs (PeLEDs) are fabricated on 50 μm thick polyimide substrates. Using colloidal 2D formamidinium lead bromide perovskite emitter, the PeLEDs show a high current efficiency (ηCE) of 5.3 cd A-1 with a peak emission at 529 ± 1 nm and a narrow width of 22.8 nm. The resultant green emission shows color saturation > 95%, in the Rec. 2020 standard gamut area. To demonstrate mechanical flexibility, the device functionality is tested by dynamic bending experiments down to 10 mm for up to 5000 cycles, resulting in device lifetime over 36 h in a glove box and a drop of ηCE and external quantum efficiency (ηext) as low as 15% and 18%, respectively. For the selective activation of multiple PeLEDs, 7 × 7 passive arrays on rigid and flexible substrates are demonstrated. Moreover, preliminary results of active matrices show the compatibility of PeLEDs with oxide-based Thin-Film Transistors (TFTs) for display applications.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Sensor Technology Research Centre
Depositing User: Niko Munzenrieder
Date Deposited: 24 Jun 2019 16:22
Last Modified: 01 Jul 2019 12:00
URI: http://sro.sussex.ac.uk/id/eprint/84489

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