Fig. 4: Characteristics of PeLEDs based on alkali metals doped PeQW arrays. | Nature Communications

Fig. 4: Characteristics of PeLEDs based on alkali metals doped PeQW arrays.

From: Ultrapure and efficient electroluminescence in alkali metal doped inorganic perovskite quantum wires arrays

Fig. 4

a Schematic of alkali metals doped PeQWs-based LED architecture. b Cross-sectional SEM image of a device. The thickness of each layer, which can be confirmed by SEM, are shown below: Al electrode/Al2O3 hole blocking layer (~5 nm)/PeQWs emission layer (90 nm)/TAPC hole transporting layer (20 nm)/HAT-CN hole injecting layer (20 nm)/ITO transparent electrode (90 nm). Scale bar, 200 nm. c Energy band diagram of each layer in PeLEDs. d Normalized electroluminescence spectra of blue and green PeLEDs. e The corresponding CIE coordinates of blue and green PeLEDs. f Current density (J)-voltage (V)-luminance (L) curves. g, h External quantum efficiency (EQE)-luminance (L) curves. i The EQEs distribution collected from 72 devices. The average peak EQEs are 15.8%, 18.2%, 20.2% and 26.2% with relative standard deviations of 7.7%, 7.3%, 11.1% and 7.3%, respectively.

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