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The extremely desirable properties of high efficiency, color tunability/fidelity, long lifetime, and low cost processing from solutions make QLED technology disruptive and will lead to next generation displays.
Our investigation provides a guideline for QLED-bandwidth optimization and useful information for the further development of QLEDs for lighting, display, and communication applications.
This study is the first account for QLEDs offering detailed insight into the light extraction efficiency enhancement of QLED devices.
The lowered turn-on voltage and improved efficiency presented here offer potential for high throughput and practical use for commercialized QLED displays.
Based on our results obtained using the Euclidean distance as a quality measure, we conclude that, contrary to our intuition and their widespread use in nature (retinas and ommatidia), hexagonal pixels do not offer any advantage over conventional square pixels.
In particular, the missing pixels are explicitly coded via a graph Fourier transform or a sparsification procedure using discrete cosine transform, leading to low coding cost.
The work demonstrates a simple method for enhancing QLED performance without modification of the device architecture and provides valuable insights into the physics of QLED operation.

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