222. Finely controlled synthesis of Zn1-xMgxO nanoparticles with uniform size distribution used a…

Fig. 1 Schematic diagram of the experimental setup: (a) by traditional one-pot and (b) by Corning advanced-flow reactor (AFR).

Fig. 2 Morphology and size distribution of the Zn1-xMgxO NPs with a Mg ion doping concentration of x = 15%. Size distribution of the NPs synthesized (a) by AFR and (b) by traditional one-pot synthesis, respectively. (c) HRTEM images of the Zn1-xMgxO NPs synthesized by AFR; the inset is a close-up view of single Zn1-xMgxO NPs. (d, e) Top AFM views of the NPs synthesized by AFR and the traditional one-pot synthesis method, respectively.

Fig. 3 (a) Schematic diagram of the QLED. (b) J-V-L, (c) EQE-L, (d) C.E.-L, and (e) P.E.-L characteristics. (f) Carrier mobility of the two samples.

Dawei Qi, et al, ACS Appl. Electron. Mater. 4, 1875 (2022)
https://doi.org/10.1021/acsaelm.2c00088

(1) ZnO nanoparticles (NPs) are the most widely used electron transport layer (ETL), mainly because of their high electron mobility, strong coupling effect, and conductive band edge matched with that of the emissive layer (EML), which enables the excellent injection of electrons from ZnO NPs to the emissive layer.
(2) The products were then dispersed with ethanol under nitrogen conditions to form Zn1-xMgxO ink with a concentration of 30 mg/mL. The ink was then sealed and stored under ambient conditions. The size distributions of the Zn1-xMgxO NPs were taken using a Malvern Nano-Series Zetasizer instrument.
(3) Wettability of the Zn1-xMgxO NPs film was measured with an SL150L contact angle and interface tension meter.
(4) The reason for the better size uniformity with the Corning advanced-flow reactor (AFR) may be attributed to the fact that the AFR had faster mass/heat transfer and exchange processes.
(5) It is believed that the uniformsize distribution of Zn1-xMgxO NPs is responsible for the low leakage current because of the formation of a smoother surface.