Environmentally Friendly InP-Based Quantum Dots for Efficient Wide Color Gamut Displays

Quantum dots (QD) are regarded as ideal light emitters for current and next-generation displays. Hence, there is an urgent need to produce environmentally friendly QDs that show high efficiency and better color purity. From this perspective, a strategy of tuning the wavelength and spectral width is discussed to optimize the brightness and color space agreement. The critical parameters affecting photophysical properties, such as the uniformity of the InP QD core, the thickness and shape of the ZnSe shell, the electron/hole distribution, surface dangling defects, oxidative phase, and the stacking faults in the crystalline structure, are examined. In addition, quantitative analyses are suggested to understand the nature of the ligands so that practical applications can be diversified. Recently, QD-LEDs using InP-based QDs with controlled shell structure showed potential for future commercialization. For further development, improvement in the stability via the control of inorganic and organic passivating structures is required.