Fig. 1. (Color online) (a) Epitaxial structure of blue LED. (b) The micron-pillar array structures after lithography and ICP etching. (c) N-type and P-type Cr/Au electrodes are manufactured in only one step. (d) Micron-pillar structures with the CIS ((CuInS₂-ZnS)/ZnS) core-shell quantum dots.

Fig. 2. (Color online) (a) Bird’s eye view microscope image of the blue micron-pillar LED array. (b) The enlarged picture of micron-pillar structures. (c) SEM image of the blue micron-pillar LED array. (d) The cross-sectional view SEM image of blue micron-pillar LED array.

Fig. 3. (Color online) (a) I–V characteristics of one hybrid micro-LED. The inset is the leakage I–V curve in semi-log scale. (b) The EL spectra of the hybrid white micro-LED array at the different injection current density. (c) The picture of hybrid white micro-LED array emission at the injection current of 0.1 mA. (d) The picture of hybrid white micro-LED array emission at the injection current of 1 mA.

Fig. 4. (Color online) (a) The PL spectra of CIS quantum dots and one pixel in the hybrid white micro-LEDs array. (b) The locations of hybrid white LEDs in the CIE 1931 chromaticity diagram.