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Augmented reality (AR) and virtual reality (VR) are emerging interactive technologies that realize the “metaverse,” leading to a totally new digital interactive experience in daily life in various aspects. In order to provide users with a more immersive experience, displays for AR/VR have rapidly evolved to achieve high resolutions and a large colo...
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... PeNCs have a high photoluminescence (PL) quantum yield (PLQY) close to unity, facile and wide color tunability by halide anion exchange, and exceptional color purity owing to their narrow emission spectra with full width at half maximum of 20 nm, which is much smaller than those of inorganic quantum dots (QDs) (25 to 40 nm) or organic emitters (≥40 nm) (4,5). Because of their unique optical characteristics, PeNCs have been regarded as highly suitable light emitters for potential use in next-generation displays that provide immersive experiences featuring vivid and realistic contents (1)(2)(3)(4)(5)(6)(7). ...
We present a universal direct photocatalytic patterning method that can completely preserve the optical properties of perovskite nanocrystals (PeNCs) and other emissive nanomaterials. Solubility change of PeNCs is achieved mainly by a photoinduced thiol-ene click reaction between specially tailored surface ligands and a dual-role photocatalytic reagent, pentaerythritol tetrakis(3-mercaptopropionate) (PTMP), where the thiol-ene reaction is enabled at a low light intensity dose (~ 30 millijoules per square centimeter) by the strong photocatalytic activity of PeNCs. The photochemical reaction mechanism was investigated using various analyses at each patterning step. The PTMP also acts as a defect passivation agent for the PeNCs and even enhances their photoluminescence quantum yield (by ~5%) and photostability. Multicolor patterns of cesium lead halide (CsPbX3)PeNCs were fabricated with high resolution (<1 micrometer). Our method is widely applicable to other classes of nanomaterials including colloidal cadmium selenide-based and indium phosphide-based quantum dots and light-emitting polymers; this generality provides a nondestructive and simple way to pattern various functional materials and devices.
The heavy use of toxic and volatile solvents such as dimethylformamide (DMF) and dimethylsulfoxide (DMSO), in the chemical synthesis of perovskites is known to pose several sustainability challenges that significantly hinder their mass production for commercial applications. Herein, a polymerizable monomer solvent (4‐acryloylmorpholine, ACMO) is introduced that permits the growth and optical lithography of perovskite quantum dots (PQDs) through in situ polymerization. Morphological, structural, and optical analyses show that this polymerizable monomer can act both as a solvent to dissolve the perovskite precursor and as a monomer for photopolymerization reactions, allowing direct in situ fabrication and patterning of PQDs. By direct photolithography, colorful PQD patterns with high photoluminescent quantum yields, high resolution (minimum size of 5 µm), and excellent fluorescence uniformity, are successfully demonstrated. The work provides a new sustainable way of in situ patterning PQDs using polymerizable monomer solvents, leading to significant advances in various integrated applications, such as photonic, energy harvesting, and optoelectronic devices.
In the present work, we demonstrate pure green-emitting AIGS/AGS QDs achieved via an HF-assisted one-pot synthesis strategy and demonstrate high-luminance QLEDs utilizing the synthesized QDs.
High‐resolution (HR) displays are in much demand as metaverse makes near‐eye displays the most important equipment in recent years. Based on wave optics, a microscale optical crosstalk model for HR display devices is proposed. It is indicated that the pixel pattern will be distorted over long‐distance transmission in light‐emitting devices with inner periodic microstructure, and the optical distortion is related to the size of pixels and the distance from the emitting layer to the outlet. A bottom emissive HR red quantum dot light‐emitting diode (QLED) array is introduced to confirm the model and a top emission scheme is provided to effectively reduce the transmission distance and suppress the pixel distortion. Optical‐crosstalk‐free pixels are finally achieved by adopting the optimized top‐emission cathode thickness of 30 nm. This study provides a direction for realizing high‐quality and high‐resolution micro‐displays.
