Fig. 1. (a) Schematic illustration of the surface in the CsPbBr3 QDs with ligand modification process, (b) XRD patterns, (c) FTIR spectra, and (d) HRTEM images for CsPbBr3 QDs.

Fig. 2. (a) PL spectra, (b) absorption spectra, and (c) lifetime of the CsPbBr3 QDs films. (d) XPS survey spectra of CsPbBr3 QDs. (e) Cs-3d spectrum, (f) Pb-4f spectrum, and (g) Br-3d spectrum. All peaks were calibrated using C 1s (284.8 eV).

Fig. 3. AFM images of the (a) CsPbBr3-OA and (b) CsPbBr3-DA QDs films.

Fig. 4. (a) and (b) Evolution of CsPbBr3 QDs coated on LED chips. The optical properties of (c)–(e) CsPbBr3-OA QDs and (f)–(h) CsPbBr3-DA QDs coated on LED chips. (c) and (f) Emission spectra, (d) and (g) green light purity analyses, and (e) and (h) behaviors of chromaticity coordinates with the addition of QDs solution.

Fig. 5. Optical properties of QDs coated on blue LEDs. (a) and (d) Spectrum intensity, (b) and (e) FWHM, and (c) and (f) behaviors of chromaticity coordinates under different injection currents.