Realizing pixelated quantum‐dot light‐emitting diodes for high‐resolution displays remains a challenging task because of the difficulty of fine patterning the quantum‐dots. In this study, instead of patterning the quantum‐dots, the color‐converting cavities for realizing high‐resolution pixelated emission are developed. By defining the thicknesses of the transparent electrodes (phase tuning layers) through a photolithographic process, the resultant cavities can selectively convert the unpatterned quantum‐dot white emission as saturated red, green, and blue emission with a brightness of 22170, 51930, and 3064 cd m−2 at 5.5 V, respectively. The developed method enables the realization of ultrahigh density red, green, and blue emission for a display with a resolution of ≈1700 pixel‐per‐inch and a color gamut of 111% National Television System Committee; together with the advantages of quantum‐dot patterning‐free, color‐filter‐free and high brightness, the demonstrated architecture could find potential applications in various displays ranging from cell phone to emerging virtual reality and augmented reality displays.
On the basis of the comparison of diffraction efficiencies calculated by the simplified modal method to exact results predicted from rigorous coupled-wave analysis, the accuracy of modal method for subwavelength triangular-groove gratings is evaluated. It is revealed that a larger error exists in smaller grating period and lower groove depth. To enhance the validity of simplified modal method, we consider the reflection loss of propagating grating modes by using the optical thin film theory. Then, we design a highly efficient transmission two-port beam splitter grating with subwavelength triangular-grooves by using the enhanced simplified modal method. The physical mechanism of the designed grating splitter with a high transmitted performance over a broad spectrum and a wide angular spectrum can be explained by using the modal method with consideration of accumulated average phase difference of two excited propagating grating modes. Obviously, the designed splitter with triangular-grooves has higher transmitted diffraction efficiency and more broadband property than that with general rectangular ones. The broadband highly efficient transmission characteristic can be attributed to gradient effective index from air-grating interface to grating-substrate interface.
The immaturity of color patterning technology and the poor stability of blue (B) quantum-dots are two of the challenges that restrict the development of quantum-dot electroluminescence displays. In this work,...
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