Highly Luminescent Dual-Color-Emitting Alloyed [ZnxCd1–xSeyS1–y] Quantum Dots: Investigation of Bimodal Growth and Application to Lighting

Abstract

Bimodal growth and application of highly luminescent alloyed [ZnxCd1–xSeyS1–y] quantum dots (QDs) with controllable dual emission peaks in one-pot synthesis is investigated in this study. The bimodal-size-distributed alloyed [ZnxCd1–xSeyS1–y] QDs are grown from alloyed [ZnxCd1–xSey] seeds by introducing a monomer within the bimodal growth window during the seed growth. The synthesized bimodal alloyed [ZnxCd1–xSeyS1–y] QDs have a quantum yield as high as 95% under single wavelength excitation, where larger and smaller size groups individually contribute to 30% and 65%, respectively. The relative PL intensity and wavelength of the bimodal alloyed QDs can be adjusted by varying the growth time and the monomer concentrations. The dual-emitting QDs with color tunability can be directly applied to QD-converted light emitting diodes (LEDs), which need neither postmixing nor color-adjusting process to vary the color axis and the color rendering index. This one-pot synthetic approach not only solves the mixing pro...