Extended Data Fig. 2: Effect of HF and ZnCl2 additives on structure and optical properties.
From: Efficient and stable blue quantum dot light-emitting diode
a, SAED and XRD patterns of ZnTeSe/ZnSe/ZnS C/S/S QDs prepared without any additives (left), with HF only (middle) and with ZnCl2 only (right). The red, yellow and green dashed lines indicate stacking faults assigned to 26°, 29° and 50°, respectively. b, STEM images (white scale bar, 20 nm). Inset, high-resolution TEM images (yellow scale bar, 2 nm), c, d, Absorption and photoluminescence spectra (c) and TR-PL profiles (d) of ZnTeSe/ZnSe/ZnS C/S/S QDs prepared without any additive (‘None’), with HF only and with ZnCl2 only. Average decay lifetimes fitted with a multi-component exponential function are indicated. e, f, Absorption and photoluminescence spectra (e) and TR-PL profiles (f) of ZnTexSe1−x/ZnSe/ZnS C/S/S QDs with x = 0, 0.033, 0.067 and 0.1. g, Schematic energy level diagram of radiative and non-radiative transition pathways. CB, conductance band; VB, valence band.
