What is QLED?

QLED (Quantum-Dot LED) is LCD technology enhanced with a quantum-dot layer. Quantum dots are semiconductor nanocrystals (2–10 nm diameter) that emit specific wavelengths of light when stimulated by the LCD backlight. Instead of using traditional RGB color filters (which absorb 60–70% of backlight), quantum dots convert backlight photons into precise wavelengths, achieving higher color saturation and brightness. Samsung coined "QLED" branding in 2017; Hisense, TCL, and others use equivalent QD-LCD technology (non-Samsung QD arrays).

**How quantum dots enhance LCD technically:** Traditional LCD pixel uses red/green/blue color filters that are organic dyes — broad spectral absorption. A QD-LCD pixel places a quantum dot array between the backlight and LCD layer. Backlight (blue LED) hits quantum dots; QD's bandgap determines emission wavelength. Red QD emits 650 nm (red), green QD 530 nm (green). This produces narrower emission spectra (60 nm FWHM vs 100+ nm for dyes), enabling 90–100% DCI-P3 color gamut (vs 70–80% traditional LCD). Peak brightness increases because less light is absorbed by the QD layer vs traditional dyes.

**Why it matters to buyers:** QLED achieves vibrant, saturated colors rivaling OLED on high-brightness content (HDR movies in bright rooms). Cannot achieve true black (backlight always leaks some light, contrast ratio ~5000:1 vs OLED infinite). No burn-in risk. Cost lower than OLED (simpler manufacture). Excellent for bright rooms; OLED superior in dark rooms.

**What to look for:** - Color gamut: 90–100% DCI-P3 (vs traditional LCD 70–80%) - Peak brightness: 1500–4000 nits (brighter than OLED) - Contrast ratio: 5000:1 (no true black) - No burn-in (LCD advantage) - "Neo QLED" = QLED + mini-LED backlight (combines both enhancements)

Real-world 2026: Samsung QN95D Neo QLED 85" (4000 nits), TCL QM8 QLED (3000 nits), Hisense U8 QLED (3500 nits). Most premium TVs 65"+ now include QLED/QD-LCD.