Research Processes in Fabricating Micro-patterned Quantum Dot Films by Solution Processes †

doi:10.7503/cjcu20190671

Abstract

Abstract:

Quantum dot light emitting diode devices(QLEDs) have attracted widespread attention due to their good color rendering, high color purity, andstable performance. It can be used to manufacture display devices with ultra-thin structures or flexible structures. As the crucial light-emitting layer, high-quality quantum dot(QD) film is very important for realizing the high-performance of QLED device. This article reviews the research progress of solution-based QD films in recent years, where both the advantages and the perspectives are discussed. Furthermore, we also introduced the recently developed fiber-assisted controllable liquid transfer strategy and its application in preparing untrasmooth QD films. The review may offer guidance in preparing high quality QD film using solution processes.

Key words: Solution process, Thin film, Quantum dot light emitting diode devices(QLEDs) device

CLC Number:

O647

TrendMD:

ZHANG Min, LIU Huan. Research Processes in Fabricating Micro-patterned Quantum Dot Films by Solution Processes ^†[J]. Chem. J. Chinese Universities, 2020, 41(3): 401.

Figures/Tables 10

Fig.1 Luminescent material QDs[18] QDs with different chemical compositions show different color luminescences; and QDs with different sizes show different color luminescences. Copyright 2009, American Chemical Society.

Fig.2 QLED device, the QD layer is a light emitting layer[50] (A) QLED device structure; (B) QD films; (C) QD core-shell structure and surface ligand. Copyright 2019, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fig.4 Preparation of patterned QD films by inkjet printing[13,31,32] (A1), (A2) Inkjet printing schematics and related array patterns, Copyright 2016, Society for Information Display; (B1)—(B3) the green and red QLED arrays by inkjet printing, Copyright 2015, American Chemical Society; (C1)—(C3) QD array and single pattern 3D topography by inkjet printing, Copyright 2016, American Chemical Society.

Fig.5 Preparation of QD patterns by transfer printing[12,36] (A) Monochrome QDs film prepared by transfer printing, Copyright 2008, American Chemical Society; (B) high-resolution QD pattern by intaglio transfer printing, Copyright 2015, Nature Publishing Group.

Fig.6 Preparation of QD films by other methods[15,37] (A) Direct 3D printing of QLED; (B) QLED prepared by 3D printing, Copyright 2014, American Chemical Society; (C) preparation of QD films by mist deposition, Copyright 2008, American Institute of Physics.

Fig.7 Fibrous controllable liquid transfer for preparation of the ultrasmooth QD films[49] (A) Schematic cartoons of the dynamic balance of QDs during the solution transfer process guided by the conical fibers; (B) Fluorescence microscope images of the as-prepared green QD film under UV irradiation; (C) the RMS(the root mean squared roughnesses) value of the QD film is about 1 nm; (D)—(F) electroluminescent images of the green, red, and blue QLED devices, respectively. Copyright 2018, American Chemical Society.

Fig.8 Preparation of QD films guided by the fibrous liquid bridge[50] (A) Schematic illustration of the liquid transfer process guided by the fibrous liquid bridge; (B) the as-prepared white QLED operated at 4 V and the corresponding normalized electroluminescence spectrum; (C) the printing area(cm2) and liquid consumption volume(μL) shows a quasi-linear correlation; (D) as-prepared green QD films with areas of 2, 4, 6, 8, 10, and 12 cm2, showing a rather fair homogeneous distribution and well-defined profiles. Copyright 2019, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fig.9 Schematic diagram of QLED device

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