Fig. 1. Absorption and PL spectra of green quantum dot. Insets depict images of green quantum dot ink contained in an ink cartridge under natural light (above) and UV light (below)

Fig. 2. Images of BM layer with a thickness of 14 μm. (a) OM image; (b) SEM image

Fig. 3. Process flow chart for preparing quantum dot color conversion (QDCC) layer

Fig. 4. 3D model of green QDCC in Tracepro

Fig. 5. Irradiance maps and 2D-profiles on receiving surfaces at different distances between LED and BM (normalized to peak irradiance). (a) 3 μm; (b) 13 μm; (c) 23 μm; (d) 2D-profile of irradiance map along central axis

Fig. 6. Irradiance maps and 2D-profiles of receiving surfaces for BM with different linewidths (normalized to peak irradiance). (a) 4 μm; (b) 5 μm; (c) 6 μm; (d) 7 μm; (e) 8 μm; (f) 2D-profile of irradiance map along central axis (magnified image showing optical crosstalk)

Fig. 7. OM images of quantum dot printed on substrates with or without RIE treatment. (a) Untreated; (b) treated

Fig. 8. Images of green quantum dot film with thicknesses of 5 μm and 14 μm, respectively. (a) OM image with thickness of 5 μm; (b) SEM image with thickness of 5 μm; (c) OM image with thickness of 14 μm; (d) SEM image with thickness of 14 μm

Fig. 9. Optical performance of QDCC LED under 450 nm blue excitation. (a) Luminance-current curve of device with a thickness of 14 μm; (b) PL spectra of device with a color conversion layer thickness of 5 μm at different currents; (c) PL spectra of device with a color conversion layer thickness of 14 μm at different currents; (d) PL spectra of QDCC layer devices at 200 mA current with different thicknesses; (e) color gamut