Long Chain Ligands of Quantum Dots to Enhance Patterning Yield of 100%

To applicate in display devices, high-resolution is inevitably required. We used colloidal quantum dots (QDs) because of its superior photoelectric properties such as tunable bandgap, high color purities, and high photoluminescence quantum yields (PLQY). For patterning QDs, dry transfer printing is promising because it maintain intrinsic properties of QDs. Depending on the type of ligands used, the patterning yield is affected and the use of a ligands having a high patterning yield is required. Here, we compared QDs with organic (C8-C18) and inorganic (I ) ligands. Long organic chain ligands showed ~100% patterning yields. Because of weak interparticle attraction between QDs and ligands, short organic chain ligands showed internal crack. Inorganic ligands also not effective to patterning because of poor adhesion

TRANSFER PRINTING METHOD FOR POLAR LIGAND TREATED QUANTUM DOT, POLAR LIGAND TREATED QUANTUM DOT LAYER PREPARED BY THE METHOD AND ELECTRONIC DEVICE

본 발명은 극성을 갖는 리간드로 표면처리된 양자점의 전사 인쇄 방법, 상기 방법으로 제조된 극성을 갖는 리간드로 표면처리된 양자점 박막 및 전자소자를 개시한다. 본 발명은 제1 기판 상에 제1 극성을 갖는 리간드로 표면처리된 양자점을 포함하는 양자점 박막을 형성하는 단계; 상기 양자점 박막을 스탬프를 이용하여 픽업하는 단계; 및 상기 스탬프를 이용하여 상기 양자점 박막을 제2 기판에 전사하는 단계;를 포함하고, 상기 스탬프는 제2 극성을 갖는 자가조립 단분자막으로 표면처리된 것을 특징으로 한다

Advancing Ultrathin Skin-attachable Displays with UltraHigh-resuolution Full-color Perovskite Nanocrystal Patterning

High-definition red/green/blue (RGB) pixels and deformable form factors is vital for the development of next-generation advanced displays. Here in, we present innovative approach using ultrahigh-resolution full-color perovskite nanocrystal (PeNC) patterning for ultrathin wearable displays. A double-layer transfer printing method is developed to prevent internal cracking of PeNC film while transfer process, resulting in RGB pixelated PeNC patterns with 2550 pixels per inch and monochromatic patterns with 33,000 line pairs per inch with achieving 100% transfer yield. Transfer-printed perovskite light-emitting diodes (PeLEDs) exhibit remarkable electroluminescence characteristics compared to previously reported printed PeLEDs. Additionally, double-layer transfer printing enables the fabrication of ultrathin multicolor PeLEDs operating on curvilinear surfaces under mechanical deformation. These results demonstrate promising potential of PeLEDs for high-definition full-color wearable displays

Advanced Full-Color Perovskite Nanocrystal Patterning for Next-Generation Ultrathin Skin-Attachable Displays

We present a novel ultrahigh-resolution perovskite nanocrystal (PeNC) patterning technique for ultrathin wearable displays. Our method employs double-layer transfer printing to layer PeNCs and organic charge transport layers, preventing internal cracking and achieving RGB pixelated patterns at 2550 PPI and monochromatic patterns at 33,000 line pairs per inch. The resulting perovskite light-emitting diodes (PeLEDs) display exceptional electroluminescence, with quantum efficiencies significantly higher than previously reported printed PeLEDs. This technology enables the creation of flexible, multicolor PeLEDs that adhere to curvilinear surfaces, including human skin, supporting various mechanical deformations. These advancements suggest significant potential for PeLEDs in future high-definition wearable displays