Highly Efficient Pure‐Blue Light‐Emitting Diodes Based on Rubidium and Chlorine Alloyed Metal Halide Perovskite

Journal Article · 13 July 2021 · Advanced Materials

DOI: https://doi.org/10.1002/adma.202100783 · OSTI ID:1808006

Yang, Yang  ^[1]; Xu, Shuang ^[2]; Ni, Zhenyi ^[2]; Van Brackle, Charles H. ^[2]; Zhao, Liang ^[2]; Xiao, Xun ^[2]; Dai, Xuezeng ^[2]; Huang, Jinsong ^[2]

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1. Department of Applied Physical Sciences University of North Carolina Chapel Hill NC 27599 USA, School of Materials Science and Engineering Tianjin Key Lab for Rare earth Materials and Applications Nankai University Tianjin 300350 China
2. Department of Applied Physical Sciences University of North Carolina Chapel Hill NC 27599 USA

Abstract Perovskite light‐emitting diodes (PeLEDs) are promising candidates for display and solid‐state lighting, due to their tunable colors, high conversion efficiencies, and low cost. However, the performance of blue PeLEDs is far inferior to that of the near‐infrared, red, and green counterparts. Here, the fabrication of pure‐blue PeLEDs with an emission peak at 475 nm, a peak external quantum efficiency of 10.1%, and a maximum luminance of 14 000 cd m ⁻² is demonstrated by tailoring the compositions of perovskites. The pure‐blue electroluminescence is achieved by simultaneous addition of rubidium and chlorine ions into CsPbBr ₃ and incorporation of phenylethylammonium chloride forms quasi‐2D hybrid perovskites. The combination of these composition engineering results in blueshifted emissions without reducing the quantum yield. The judicious alloying is shown to be critical to result in the better morphology with suppressed current leakage and enhanced light outcoupling.

• Sponsoring Organization: USDOE
• OSTI ID: 1808006
• Journal Information: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 33 Vol. 33; ISSN 0935-9648
• Publisher: Wiley Blackwell (John Wiley & Sons)Copyright Statement
• Country of Publication: Germany
• Language: English