Emission tuning of highly efficient quaternary Ag-Cu-Ga-Se/ZnSe quantum dots for white light-emitting diodes

Tailoring the optoelectronic properties of eco‐friendly CuGaS2/ZnSe core/shell quantum dots for boosted photoelectrochemical solar hydrogen production

“…Fortunately, the growth of appropriate ZnSe shell materials can sufficiently passivate the surface defects of bare CGS QDs for largely improved optical properties. As a result, PL spectra of CGS/ZnSe #1, #2, #3 QD samples in Figure 3B demonstrated strong emission with PL peaks centered at ~590 nm, while the PL peaks slightly blue‐shifted from CGS/ZnSe #1–#2 and #3 QD samples, which can be assigned to Zn 2+ diffusion into the CGS core by etching or cation exchange during QD's synthesis 46–48 …”

“…As a result, PL spectra of CGS/ZnSe #1, #2, #3 QD samples in Figure 3B demonstrated strong emission with PL peaks centered at $590 nm, while the PL peaks slightly blue-shifted from CGS/ZnSe #1-#2 and #3 QD samples, which can be assigned to Zn 2+ diffusion into the CGS core by etching or cation exchange during QD's synthesis. [46][47][48] Time-resolved PL spectra of CGS/ZnSe #1, #2, #3 QD samples were further obtained under 450 nm excitation and displayed in Figure 3C-E (Detailed fitting parameters and calculation of average lifetime are shown in Table S6), wherein the average PL lifetimes of CGS/ZnSe #1, #2, #3 QD samples were calculated to be 140, 304, 223 ns, respectively. Notably, prolonged average PL lifetime from CGS/ZnSe #1-#2 core/shell QDs suggests the optimized surface passivation of bare CGS following increased ZnSe shell thickness.…”

Luminescent AgGaSe2/ZnSe nanocrystals: rapid synthesis, color tunability, aqueous phase transfer, and bio-labeling application

“…[1][2][3] On the other hand, synthesizing AgGaSe 2 with a size less than 10 nm also attracts attention due to the potential of such a nanomaterial applied as a luminescent probe and phosphor. [4][5][6] For example, Kameyama et al reported the preparation of AgGaSe 2 quantum dots (QDs) with an average size of ca. 3.3 nm using selenourea as the precursor, and the application of its derived Ag x In y Ga (1−y) Se 2 QDs for near-infrared in vivo imaging.…”

“…1–3 On the other hand, synthesizing AgGaSe 2 with a size less than 10 nm also attracts attention due to the potential of such a nanomaterial applied as a luminescent probe and phosphor. 4–6 For example, Kameyama et al . reported the preparation of AgGaSe 2 quantum dots (QDs) with an average size of ca.…”

Passivation and Interlayer Effect of Zr(i-PrO)4 on Green CuGaS2/ZnS/Zr(i-PrO)4@Al2O3 and Red CuInS2/ZnS/Zr(i-PrO)4@Al2O3 QD Hybrid Powders

“…Surface passivation of QDs is a facile process that can be utilized during the synthesis of I–III–VI QDs for green and red (GR) color-converting materials in white LEDs [ 10 – 16 ]. It is well known that the ligand passivation of QDs can form a protective layer to improve the material stability of QDs against environmental attacks, such as those by light, humidity, and operation heat [ 17 – 20 ].…”