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Color Vision

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Wide-Color-Gamut, Eco-Friendly Full-Color QLED Displays Enabled by SEL-WQLEDs With Interference Color Filters.

Run Wang^1,2, Hengyang Xiang¹, Botao Ji³

¹MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.

Small (Weinheim an Der Bergstrasse, Germany)

|March 25, 2026

Summary

This summary is machine-generated.

This study introduces eco-friendly, heavy-metal-free quantum dot light-emitting diodes (QLEDs) for displays. By optimizing charge and energy transfer, these QLEDs achieve improved performance and enable vibrant full-color displays for AR/VR applications.

Keywords:

FRET a single white emissive layer full color display heavy‐metal‐free QDs wide color gamut

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Quantum dot light-emitting diodes (QLEDs) offer next-generation display potential but face challenges with toxic heavy metals and scalable fabrication.
Existing QLEDs often rely on cadmium/lead (Cd/Pb)-based quantum dots (QDs), raising environmental and health concerns.
Developing heavy-metal-free alternatives and efficient display architectures is crucial for sustainable QLED technology.

Purpose of the Study:

To develop eco-friendly, heavy-metal-free single-emissive-layer white QLEDs (SEL-WQLEDs) using red/green/blue QDs (R-/G-/B-QDs).
To enhance electroluminescence (EL) performance and spectral properties of SEL-WQLEDs through controlled charge distribution and Förster resonant energy transfer (FRET).
To demonstrate a viable technical route for full-color QLED displays, suitable for near-eye applications like AR/VR.

Main Methods:

Fabrication of SEL-WQLEDs using a mixture of heavy-metal-free R-/G-/B-QDs in the emissive layer (EML).
Optimization of charge distribution and FRET within the mixed EML to improve device performance.
Integration of interference color filters (ICFs) onto SEL-WQLED pixels to achieve full-color display capabilities.

Main Results:

The optimal SEL-WQLED achieved a peak external quantum efficiency (EQE) of 4.9% with balanced R/G/B emission.
The QLED display integrated with ICFs demonstrated a wide color gamut of 113% NTSC.
Excellent viewing-angle spectral stability (0°-30°) was achieved, meeting AR/VR application requirements.
A functional prototype inspired by Google Glass was successfully demonstrated.

Conclusions:

The developed heavy-metal-free SEL-WQLEDs offer a promising and eco-friendly alternative for next-generation displays.
The proposed technical route combining SEL-WQLEDs with ICFs enables high-performance, full-color QLED displays.
This approach addresses key challenges in QLED technology, paving the way for sustainable display solutions in AR/VR and beyond.