Photo-Patternable Quantum Dots/Siloxane Composite with Long-Term Stability for Quantum Dot Color Filters

Abstract

Incorporation of quantum dots (QDs) into color filters (CFs) are desired for less energy loss and wider viewing angle compared to a conventional display. However, aggregation and vulnerability to heat, moisture, and chemicals in the photo-patternable matrix are critical issues of the QD-CFs with high QDs concentration. Herein, we fabricated red (10 wt %) and green (20 wt %) QD-CFs using photolithography of QD/siloxane ink containing secondary thiol monomer. Ligand-exchanged QDs were chemically incorporated in methacrylate oligosiloxane resin. QD/siloxane composite showed superior stability under harsh heat and moisture (85 °C/5% RH and 85 °C/85% RH) conditions and chemicals (EtOH, HCl, and NaOH) compared to conventional QD/PR (commercial negative photoresist). QD-CFs (10 μm thick) effectively converted blue light emitted from LED chip into red and green light, and the obtained white PL through QD-CF showed wide color gamut, which was 108% relative to NTSC. From these advantages, QD/siloxane composite will be beneficial as color-conversion photoresists are to be used as color filters in liquid crystal displays, micro light-emitting diodes, and organic light-emitting diodes.

Aptamer-Conjugated Quantum Dot Optical Biosensors: Strategies and Applications

“…Many efforts have been devoted to overcoming these limitations (Table 2). Coating surface of QD with silica Non-toxic, biocompatible, chemically inert, optically transparent, protect from leaching of toxic QD components [89,90] Use of eco-friendly synthetic method Bacteria, fungi, virus-driven biosynthesis Need for optimization of biosynthesis, recovery, and purification process [91] • Use of bacteria • CdS QD production from Escherichia coli, Moorella thermoacetica, Acidithiobacillus, Pedobacter sp., Thermoanaerobacter sp.…”

“…Unlike the surface change approach, encapsulation provides large QDs with a high quantum yield. The silanization method can decrease the toxicity of QDs by covering the surface of QDs in a silica shell [89,90]. The silica surface is non-toxic and relatively biocompatible and prevents the leaching of toxic QD components (e.g., Cd).…”

Assessing Stability of Nanocomposites Containing Quantum Dot/Silica Hybrid Particles with Different Morphologies at High Temperature and Humidity

“…We tested the stability of the nanocomposites against high temperatures and humidity by monitoring their quantum efficiencies. The most commonly used stability test against heat and moisture is conducted at 85 °C/85% RH for tens of days, − during which the interaction of the QD surface with oxygen and water molecules deteriorates the PL properties . However, in this study, we conducted stability tests of nanocomposite films under harsher condition (100 °C/85% RH) to shorten the time required for the experiments (72 h) and monitored the changes in the PL properties.…”

Asymmetric Quantum-Dot Pixelation for Color-Converted White Balance

“…Quantum-dot (QD) materials, as a competitive alternative, enable efficient fluorescent conversion with higher color purity for backlights or direct displays. − The QD-enhanced display architectures develop initially from QD films with a sandwiched structure for liquid crystal display backlight, graduate into state-of-the-art QD color conversion films (QDCCF) for organic light-emitting diode displays (OLED) or inorganic micro-LED, and finally go into the electroluminescent quantum-dot light-emitting diode (QLED) devices. ,,,− A patterned and pixelated QDCCF can realize independent primary color extraction and spatial color mixing, which has been proven to be a promising way to replace absorptive color filters. , Compared with traditional displays, the white balance approach is completely different in QD-converted self-emissive displays, because the final light-emitting area is no longer dependent on the pixel of the display panel itself, but redefined by the apertures of the QD formed subpixels . Especially for high-density self-emissive displays, such as mini-/micro-LEDs, it is difficult to integrate a driver and the mini-/micro-LEDs through growth techniques, because the mass transfer process is needed to integrate the three primary-color subpixels on a common backplane .…”

“…14,25,28,34−36 A patterned and pixelated QDCCF can realize independent primary color extraction and spatial color mixing, which has been proven to be a promising way to replace absorptive color filters. 37,38 Compared with traditional displays, the white balance approach is completely different in QD-converted self-emissive displays, because the final lightemitting area is no longer dependent on the pixel of the display panel itself, but redefined by the apertures of the QD formed subpixels. 39 Especially for high-density self-emissive displays, such as mini-/micro-LEDs, it is difficult to integrate a driver and the mini-/micro-LEDs through growth techniques, because the mass transfer process is needed to integrate the three primary-color subpixels on a common backplane.…”