Fabricating Quantum Dot Color Conversion Layers for Micro-LED-Based Augmented Reality Displays

Abstract

Colloidal quantum dots have attracted much attention for their potential application in the color conversion scheme of next-generation microdisplays. One of the possible methods to pattern these nanoparticles into arrays is to use quantum dot photoresists. We will demonstrate a highresolution color conversion layer with a 1.5 μm by 4 μm subpixel size and a pixel density exceeding 2000 pixels-per-inch (PPI). The photonic characteristics are analyzed, and the estimated color conversion efficiencies are 9.51% for green and 16.55% for red. A full National Television Standards Committee (NTSC) (gamut coverage: 100%, area ratio: 114%) color gamut is achieved in a 992-PPI microdisplay by adding an optical reflector on the top. Without this reflector, the coverage drops to 82.9%. A comparative study found a steady improvement for the photoresist method over the past decade, and a color conversion layer with an even higher resolution can be expected.

InGaN-based Blue Resonant Cavity Micro-LED Combined with Red-Green-Yellow Quantum Dot Color Conversion Layer for Wide Color Gamut and Energy- Efficient Full-Color Displays

“…In previous research, we explored the advantages of adding TiO 2 scattering particles in QDPR using simulation software and con rmed that the addition of an appropriate amount of scattering particles can help improve the LCE. [13,[21][22][23] In this study, we speci cally delve into the reliability aspect. Figure 2 compares green QDPR thin lms without scattering particles, with ZrO 2 added, and with TiO 2 added, respectively.…”

“…However, as display devices continue to become thinner and smaller, QD CCLs, when insu cient in thickness, tend to leak a signi cant amount of blue light, leading to a substantial drop in light conversion e ciency (LCE). [17] To address this issue, embedding QDs in nanoporous Micro LEDs can accommodate QDs [18][19][20] and increase light scattering [13,[21][22][23], improving the issue of blue light leakage. Additionally, adding nano-sized scattering particles to extend the light path is an excellent solution for enhancing LCE and light intensity.…”

High Color Conversion Efficiency Realized in Graphene-Connected Nanorod Micro-Light-Emitting Diodes with Hybrid Ag Nanoparticles and Quantum Dots Using Non-Radiative Energy Transfer and Localized Surface Plasmons

“…However, as the current increases, the junction temperature also rises, causing a reduction in the band gap and leading to a red shift between the blue peaks. Figure 6(e) provides a detailed comparison of the CCE for Samples 2-4, calculated using the following formula: [37][38][39]…”

Enhancing photoluminescence performance of perovskite quantum dots with plasmonic nanoparticles: insights into mechanisms and light-emitting applications

“…8 In recent developments, highly luminescent colloidal perovskite QDs have been synthesized, demonstrating signicant potential as downconverting color-changing agents to expand the color gamut for display applications. 9 While the PLQYs of perovskite QDs in solution are notably high, 10,11 their efficiency in solid-state thin lms lags much behind that of QD solutions. Consequently, there is an urgent demand for the development of effective strategies to achieve high PLQYs in thin lms of perovskite QDs.…”