Fig. 1. Structure of QD white LED with three different proportions and electroluminescence of QD white LED

Fig. 2. Photographs of the TEM and HRTEM of Cu‍∶‍‍Zn-In-S core and Cu∶Zn-In-S/ZnS core/shell QDs with different shell thickness. (a) Thin shell, TEM photograph; (b) thin shell, HRTEM photograph;(c) thick shell, TEM photograph; (d) thick shell, HRTEM photograph

Fig. 3. Normalized PL spectra of green and orange quantum dots with thin and thick shells

Fig. 4. PL spectra of thick shell Cu‍∶‍Zn-In-S/ZnS core/shell quantum dot WLED prepared by toluene solutions of orange and green quantum dots with different volume fractions of 1‍∶13,1∶11,1∶15 at 20 mA to 100 mA. (a) 1∶13; (b) 1∶11; (c) 1∶15

Fig. 5. Color coordinates of quantum dot WLED

Fig. 6. CRI of fluorescent lamp and Cu∶Zn-In-S/ZnS core/shell QD WLED operated at 20 mA

Fig. 7. PL spectra of Cu∶Zn-In-S/ZnS core/shell quantum dots WLEDs with different shell thickness at 20 mA (volume fraction of orange and green quantum dots toluene solutions is 1∶13)