Abstract
Quantum dot light-emitting diodes (QD-LEDs) have been considered as potential display technologies with the characterizations of high color purity, flexibility, transparency, and cost efficiency. For the practical applications, the development of heavy-metal-free QD-LEDs from environment-friendly materials is the most important issue to reduce the impacts on human health and environmental pollution. In this work, heavy-metal-free InP/ZnS core/shell QDs with different fluorescence were prepared by green synthesis method with low cost, safe, and environment-friendly precursors. The InP/ZnS core/shell QDs with maximum fluorescence peak at ~ 530 nm, superior fluorescence quantum yield of 60.1%, and full width at half maximum of 55 nm were applied as an emission layer to fabricate multilayered QD-LEDs. The multilayered InP/ZnS core/shell QD-LEDs showed the turn-on voltage at ~ 5 V, the highest luminance (160 cd/m2) at 12 V, and the external quantum efficiency of 0.223% at 6.7 V. Overall, the multilayered InP/ZnS core/shell QD-LEDs reveal potential to be the heavy-metal-free QD-LEDs for future display applications.
Highlights
With unique physical and chemical properties, quantum dots (QDs) have attracted great interest in applications such as lasers, biomedical imaging, sensors, and lightemitting diodes (LEDs) [1,2,3,4,5,6,7,8,9]
Characterizations of InP/ZnS Core/Shell QDs InP/ZnS core/shell QDs were prepared by solvothermal green synthesis with cheap, safer, and environmentfriendly precursors including InI3, ZnCl2, (DMA)3P, zinc stearate, and sulfur compared to previous studies
The X-ray diffraction (XRD) pattern showed that the diffraction peaks of InP and ZnS shifted to the positions between their theoretical values in the InP/ZnS core/shell QDs
Summary
With unique physical and chemical properties, quantum dots (QDs) have attracted great interest in applications such as lasers, biomedical imaging, sensors, and lightemitting diodes (LEDs) [1,2,3,4,5,6,7,8,9]. The QDs have been actively investigated for LED applications because of their attractive properties of size-tunable band gaps, good photostability, superior photoluminescence efficiency, and compatibility with solution-processing methods. Most of QD-LEDs have been manufactured by cadmium-based QDs, which are proved relatively easy to synthesize with high-quality optical properties [17]. The heavy-metal nature of the cadmium-based QDs has raised many concerns about carcinogenicity and other chronic health risks as well as disposal hazards. The development of heavy-metal-free QD-LEDs is the most important issue to reduce the impacts on human health and environmental pollution
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