Ultra-High-Resolution Full-Color Quantum Dot Light-Emitting Diodes through Cross-Linking-Assisted Hierarchical
Ke Fang1,2, Baoxiang Yang3, Hui Li3
1Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Abstract:
Quantum dots (QDs) are vital for virtual reality and augmented reality displays due to their tunable optical properties. Although QD color converters enable blue light-emitting diode down-conversion to green/red, efficiency and stability issues hinder their high-end display applications. Here, we employ a cross-linking-assisted hierarchical confined assembly method to fabricate red, green, and blue QD arrays. Specifically, micropillar templates with asymmetric wettability are used to sequentially deposit green and red QD microwire arrays in mutually orthogonal directions on a blue QD film, forming RGB QD arrays. 4,4'-Bis(3-vinyl-9H-carbazol-9-yl)1,1'-biphenyl (CBP-V) is introduced into QDs to solve the problem of color crosstalk. Full-color QD pixel arrays with resolutions of 1814-2117 pixels per inch (PPI) are successfully fabricated. Upon integration into devices, adjustable emission from cool white light to warm white light is observed, with a peak external quantum efficiency (EQE) of 16.14% and a peak luminance of 226 054 cd m-2.
