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

Fig. 2. Absorption and PL spectra of quantum dot film. (a) Absorption spectrum of green quantum dot film, insets are photographs of green quantum dot film in natural light and darkness; (b) PL spectra of green quantum dot film; (c) absorption spectrum of red quantum dot film, insets are photographs of red quantum dot film in natural light and darkness; (d) PL spectra of red quantum dot film

Fig. 3. Electroluminescence spectra of WLED. (a) Electroluminescence spectrum of WLED I, insets are photographs of WLED Ⅰ in natural light and darkness; (b) electroluminescence spectrum of WLED II, insets are photographs of WLED Ⅱ in natural light and darkness

Fig. 4. Stability test results of WLED at different driving currents. (a) Electroluminescence spectral changes of WLED I; (b) electroluminescence spectral changes of WLED II; (c) CIE color coordinate changes of WLED I; (d) CIE color coordinate changes of WLED II; (e) CCT changes of WLED I and WLED II; (f) LE changes of WLED I and WLED II; (g) CE changes of WLED I and WLED II; (h) CRI changes of WLED I and WLED II

Fig. 5. Thermal imaging photographs of WLED at different driving currents (unit: ℃). (a)--(c) Thermal imaging photographs of WLED I with driving currents of 20, 100, and 350 mA; (d)--(f) thermal imaging photographs of WLED Ⅱ with driving currents of 20, 100, and 350 mA

Fig. 6. Aging test of WLED at 55 ℃ and 55% relative humidity (20 mA continuous operating current). (a) Electroluminescence spectra of WLED Ⅰ; (b) electroluminescence spectra of WLED Ⅱ; (c) LE of WLED Ⅰ and WLED Ⅱ; (d) CRI of WLED Ⅰ and WLED Ⅱ