Lumination-property characterization for InP/ZnSe/ZnSeS/ZnS quantum dots with variable temperature

Red-emissive InP/ZnSe/ZnSeS/ZnS quantum dots (QDs) with multiple shells were fabricated and evaluated with a lumination-property-characterization system with variable temperature. The proposed system is capable of monitoring luminous efficiency, light intensity, optical spectra, and temperature variation of the QD solution with heating equipment. The luminous efficiency of the 611-nm QD sample decreases to 0.35 under 140°C and reverts to 0.69 under the ambient temperature (RT). The light intensity and fluorescent lifetime of the 611-nm sample show a smaller variation after heating in comparison with that of the 649-nm sample, which possesses a larger core during the synthesizing process. The proposed illumination property characterization system can effectively evaluate QDs with different excitation and temperature conditions. Our research results on InP/ZnSe/ZnSeS/ZnS QDs under various temperatures can provide guidelines for the application of InP QDs in display, illumination, and communication.