Table 2. Comparison of different light sources in LCD backlights.
| YAG WLED | KSF WLED | QDEF a | Vivid Color LED | |
|---|---|---|---|---|
| FWHM | >100 nm | 55 nm for green 2 nm for red (5 peaks) | 20–30 nm | 10 nm |
| Tunability | No | No | Yes | Yes |
| Color gamut | ~50% Rec. 2020 | 70%–80% Rec. 2020 | 80%–90% Rec. 2020 | >90% Rec. 2020 |
| Efficiency | High | High | Moderate | Low |
| Cost | Low | Moderate | High | High |
| Stability | Excellent | Good | Good | Excellent |
| RoHS | Yes | Yes | Cd-based | Yes |
Abbreviations: FWHM, full width at half maximum; KSF, potassium silicofluoride; LED, light-emitting diode; QDEF, quantum dot enhancement film; RoHS, restriction of hazardous substances; WLED, white light-emitting diode; YAG, yttrium aluminum garnet.
a
Here we only consider Cd-based quantum-dots (QDs). For heavy-metal-free QDs, e.g., InP QD, the FWHM is broader (40–50 nm) and color gamut is 70–80%. Their optical efficiency is slightly lower than that of Cd-based QDs.