Fig. 1. Structure of WLED. (a) Structure of WLED Ⅰ; (b) structure of WLED Ⅱ

Fig. 2. TEM image and particle size distribution of CsPbBr₃ perovskite quantum dots. (a) TEM image of CsPbBr₃ perovskite quantum dots, illustration shows HRTEM image; (b) particle size distribution of CsPbBr₃ perovskite quantum dots

Fig. 3. Ultraviolet visible absorption/PL spectrum of CsPbBr₃ perovskite quantum dots/toluene solution, illustration shows CsPbBr₃ perovskite quantum dots/toluene solution under UV irradiation

Fig. 4. EL spectrum and CIE color coordinate diagram. (a) EL spectrum of WLED Ⅰat current of 10 mA, illustration shows luminescence of WLED Ⅰ in dark; (b) WLED Ⅰ CIE at current of 10 mA; (c) WLED Ⅱ EL at current of 10 mA, illustration shows package diagram and its luminescence of WLED Ⅰ in dark; (d) CIE of WLED Ⅱ at current of 10 mA

Fig. 5. Comparison of EL spectra of WLED Ⅰ and WLED Ⅱ under different currents. (a) 10 mA; (b) 30 mA;(c) 70 mA; (d) 150 mA

Fig. 6. CIE comparison of WLED Ⅰ and WLED Ⅱ under different currents. (a) WLED Ⅰ at current from 10 mA to 150 mA; (b) WLED Ⅱ at current from 10 mA to 150 mA

Fig. 7. Comparison of CCT, CRI, and LE with current trends of WLED Ⅰ and WLED Ⅱ. (a) Comparison of variation trends of CCT and CRI of WLED Ⅰ and WLED Ⅱ with increasing current; (b) comparison of LE variation trends of WLED Ⅰ and WLED Ⅱ with increasing current

Fig. 8. Comparison of CCT, CRI, and LE of WLED Ⅰ and WLED Ⅱ with increasing working time. (a) Comparison of variation trends of CCT and CRI of WLED Ⅰ and WLED Ⅱ from 1 min to 720 min; (b) Fig. (a) circle part, CCT comparison of WLED Ⅰ and WLED Ⅱ working time from 1 min to 180 min; (c) comparison of LE variation trends of WLED Ⅰ and WLED Ⅱ with increasing working time