Fig. 2: Characterizations of the Cu-Ga-S/ZnS white quantum dots (WQDs) and spiral full-color emission generator (SFEG).
From: Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence
a High-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) image of the WQDs. Scale bar = 50 nm. b Representative high resolution transmission electron microscopy (HRTEM) image of the WQDs (scale bar = 5 nm) with inset corresponding to the selected area electron diffraction (SAED) pattern (scale bar = 5 1/nm). c Absorbance (UV-vis) and photoluminescence (PL) spectra of the WQDs in toluene. d Fluorescent image of the WQDs in a quartz cell with toluene as the solvent. The bottom area of quartz cuvette is 1 cm2. e The corresponding CIE color coordinates of the WQDs. f Polarizing optical microscopy (POM) images of the representative SFEG. Scale bar = 100 μm. g-i Transmission spectra (g), circularly polarized luminescence (CPL) spectra (h) and the corresponding luminescence dissymmetry factor (glum) values (i) of the representative SFEG. Source data are provided as a Source Data file.
