Fig. 5: Applications in LED devices.
From: Suppressing electron–phonon coupling for narrow-band emitting Eu(II)-based perovskitoids
a The emission spectra of white LED1, LED2 and LED3 devices at a current of 20 mA. b The color render index (Ra) and light hazard index (Lλ) of white LED1, LED2 and LED3 devices, (the error bar, ±4, from three LED devices). c The fatigue life and stability of LED3 device, the inset is photograph of LED3 (scale bar, 5 mm). d The emission spectra of four-color LED device. e Chromaticity (x, y) of as-fabricated four-color LED device with RGB band pass filters in comparison with Rec. 2020. f Comparison of color gamut for as-prepared four-color LED device and commercial LED display screens. g Schematic diagram of color mixing technique for four-color display, the inset is fluorescence microscopy picture of as-prepared micro-LED (scale bar, 10 μm) plotted using Microsoft PowerPoint. h The imaging of four-color display by as-prepared micro-LED display screen with light up four-color emission “SCUT” (scale bar, 1 cm).
