Red-Green InP/ZnSeS/ZnS QD Incorporated Color Filters for UHD Liquid Crystal Displays
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초록
내용
Cd-containing quantum dots (QD) have excellent light-emitting efficiency, narrow full width at half maximum (FWHM) and easy to tune wavelengths, but they do not comply to RoHS regulations because of their inherent toxicity. Indium phosphide (InP) QDs are eco-friendly materials and can be consider an alternative to Cd-containing QDs for use in light emitting devices. By coating thick and multilayer shell using ZnSe/ZnS, we have confirmed that the quantum yield (QY) is significantly higher than the existing ZnS shell coating. Careful tuning of lattice strain by synthesizing a gradient inter shell reduces lattice mismatch and improves performance in ZnSe1-xSx QDs. Using this strategy, InP/ZnSe1-xSx QDs are achieved 40-50nm of FWHM and QY values in the range of 50-80% in routinely. From these results, InP/ZnSe1-xSx QDs show performance comparable to Cd-based QDs in optical properties.