Multi‐Interfacial Confined Assembly of Colloidal Quantum Dots Quasisuperlattice Microcavities for High‐Resolution Full‐Color Microlaser Arrays

• Published in: Advanced materials (Weinheim) Vol. 36; no. 23; pp. e2314061 - n/a
• Main Authors: Li, Hui, Zhao, Yuyan, Qiu, Yuchen, Gao, Hanfei, He, Ke, Yang, Junchuan, Zhao, Yingjie, OuYang, Guangwen, Ma, Na, Wei, Xiao, Du, Zuliang, Jiang, Lei, Wu, Yuchen
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.06.2024
• Subjects: Arrays; Assembly; colloidal quantum dots; Concentration gradient; Display devices; Energy consumption; full‐color laser arrays; interface; Lasing; long‐range‐ordered assembly; Macroscopy; Mass transfer; Microcavities; Microlasers; Microstructure; patterning; Quantum dots; Solvents; Surface treatment; long‐range‐ordered assembly; colloidal quantum dots; full‐color laser arrays; interface; patterning
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.202314061

Colloidal quantum dots (CQDs) are considered a promising material for the next generation of integrated display devices due to their designable optical bandgap and low energy consumption. Owing to their dispersibility in solvents, CQD micro/nanostructures are generally fabricated by solution‐processing methods. However, the random mass transfer in liquid restricts the programmable construction in macroscopy and ordered assembly in microscopy for the integration of CQD optical structures. Herein, a multi‐interfacial confined assembly strategy is developed to fabricate CQDs programmable microstructure arrays with a quasisuperlattice configuration through controlling the dynamics of three‐phase contact lines (TPCLs). The motion of TPCLs dominates the division of liquid film for precise positioning of CQD microstructures, while pinned TPCLs control the solvent evaporation and concentration gradient to directionally drive the mass transfer and packing of CQDs. Owing to their long‐range order and adjustable structural dimensions, CQD microring arrays function as high‐quality‐factor (high‐Q) lasing resonant cavities with low thresholds and tunable lasing emission modes. Through the further surface treatment and liquid dynamics control, the on‐chip integration of red (R), green (G), and blue (B) multicomponent CQD microlaser arrays are demonstrated. The technique establishes a new route to fabricate large‐area, ultrahigh‐definition, and full‐color CQD laser displays. A multi‐interfacial confined assembly method is developed for the long‐range‐ordered assembly of quasisuperlattice CQD microstructure arrays by controlling dewetting dynamics. CQD microring arrays exhibit high‐Q laser resonant cavities with low thresholds and tunable laser emission modes. Surface treatment and liquid dynamics control enable on‐chip integration of multicomponent CQD microlaser arrays.