Fig. 1. (a) SLHP with methyl-PDMS concentrations of 80 wt. %, 85 wt. %, and 90 wt. % after curing at 125°C for 90 min, respectively. (b)–(c) LED images with QD/SLHP packaging structure (concentrations of QDs and methyl-PDMS are 0.8 and 85 wt. %, respectively) under injection currents of 0 and 2 mA, respectively. (d)–(e) LED images with QD/SP packaging structure (concentrations of QDs and methyl-PDMS are 0.8 and 0, respectively) under injection currents of 0 and 2 mA, respectively. Images of (f) QD/SP film (0.3 wt. % QDs), (g) SP film, (h) QD/SLHP film (0.3 wt. % QD and 85 wt. % methyl-PDMS), and (i) SLHP film (85 wt. % methyl-PDMS).

Fig. 2. Infrared transmittance spectra of methyl-PDMS, ethylene-PDMS, cured SP, and cured SLHP with 15 wt. % methyl-PDMS.

Fig. 3. Total radiant power and luminous flux of LEDs with QD/SLHP composites for different methyl-PDMS concentrations; the QD concentration is kept at 0.6 wt. %.

Fig. 4. Infrared transmittance spectrum of CdSe/ZnS QDs.

Fig. 5. Fabrication method for QD/SLHP composites. The liquid methyl-PDMS provides a flexible environment to prevent ligands on QD surfaces from being dragged away by the cross-linked ethylene-PDMS network.

Fig. 6. (a) Transmittance, haze, absorption, and reflection spectra of SP film and SLHP film (with 85 wt. % methyl-PDMS). (b)–(d) Absorption spectra of QD/SP film and QD/SLHP film with QD concentrations of 0.3 wt. %, 0.5 wt. %, and 0.8 wt. %, respectively.

Fig. 7. (a) Total radiant power, luminous flux, (b) radiant power of chip light, and radiant power of QD light of LEDs with QD/SLHP composites and QD/SP composites at different QD concentrations. (c) CCE of LEDs with QD/SLHP composites and QD/SP composites at different QD concentrations; their total radiant power and luminous flux for different CCEs.

Fig. 8. Emission spectra of LEDs with (a) QD/SLHP composites and (b) QD/SP composites at different QD concentrations.

Fig. 9. LFM of LEDs with QD/SLHP composites and QD/SP composites after nonworking aging (aging current of 0 A) and working aging with a harsh condition (aging current of 0.19 A); the QD concentration is kept at 0.6 wt. %.