23.2: Invited Paper: Challenges for Realizing QD‐LED

Abstract

This paper reports on the potential of quantum dot light emitting diode (QD-LED) as a future display technology and the challenges to realize a QD-LED based display from the perspective of materials, processes, and optical design requirements. We give an update on development of active matrix QD-LED displays using Cd free QDs.

20‐1: Invited Paper: Development of Photolithgraphic Patterning of Quantum Dots for Electroluminescent Applications

“…[13] Sharp also demonstrated a 12.3inch demo with a resolution of 176PPI. [14] The major challenge of direct photolithography of quantum dots in electroluminescent QLEDs is corlor mixing, which is caused by the quantum dot residues in the subpixels of different colors are difficult to be completely removed during development (e.g., traced of red dots can be left in green and blue subpixels), leading to color impurities, as depicted in Figure 1. The density of excitons in each qutum dot is three orders higher in electroluminescent devices than that in photoluminescent films by calculation, thus the emission of unwanted residues would be more significant in electroluminanscent applications, leading to impurities of emissions in subpixels, and lowering the color gamut of the full-color QLED display.…”

Recent Advances and Challenges of Colloidal Quantum Dot Light‐Emitting Diodes for Display Applications

“…Therefore, various display manufacturers have demonstrated QLED AM displays based on TE structures. [15,146,147] The TE structure is advantageous for obtaining high lightextraction efficiency. In the BE structure, massive optical losses occur in the glass substrate (known as the substrate mode) and ITO layer (known as the waveguide mode); as a result, the typical light extraction efficiency (LEE) is limited to about 20%.…”

“…Therefore, various display manufacturers have demonstrated QLED AM displays based on TE structures. [ 15,146,147 ]…”