"This work demonstrates the feasibility of ultra-thin, large-area quantum dot LEDs that closely match the solar spectrum," said Xianghua Wang, a corresponding author of the study. "These devices could enable next-generation eye-friendly displays, adaptive indoor lighting, and even wavelength-tunable sources for horticulture or well-being applications."
To recreate the natural spectrum of sunlight, researchers synthesized red, yellow-green, and blue quantum dots encased in zinc-sulfur shells and fine-tuned their ratios. The resulting blend was embedded into a quantum dot LED (QLED) structure built on indium tin oxide glass, with layers of conductive polymers, metal oxide particles, and a thin aluminum or silver layer. The entire light-emitting layer measured just tens of nanometers thick, comparable to wallpaper in overall device thickness.
The prototype achieved optimal performance under an 11.5-volt power supply, producing a bright, warm white light richer in red wavelengths and lower in blue intensity - qualities known to support eye comfort and sleep health. The QLED's light achieved a color rendering index of more than 92%, indicating that illuminated objects appear close to their natural colors.
In follow-up trials, the researchers fabricated 26 QLED devices with varying conductive materials. These versions reached maximum brightness at only 8 volts, and roughly 80% of them exceeded the target luminance for computer monitor applications.
Research Report:Sunlike Full-Spectrum Electroluminescent White Light-Emitting Diodes Based on Cu(In,Ga)S2 Quantum Dots Coated with Multiple ZnS Shells
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