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Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High‐Performance QLEDs
Author(s) -
Li Xiaoxun,
Hu Binbin,
Zhang Min,
Wang Xiao,
Chen Ling,
Wang Aqiang,
Wang Yunjun,
Du Zuliang,
Jiang Lei,
Liu Huan
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201904610
Subject(s) - materials science , luminance , substrate (aquarium) , fabrication , optoelectronics , diode , quantum dot , fiber , bridge (graph theory) , capillary action , light emitting diode , liquid crystal , nanotechnology , composite material , optics , medicine , oceanography , physics , alternative medicine , pathology , geology
Solution processing is widely used for preparing quantum dot (QD) films for fabricating QD light‐emitting diode display (QLED) devices. However, current approaches suffer from either the coffee‐ring effect or a large amount of wasted solution, leading to low performance and high cost. Here, a facile approach guided by a fibrous liquid bridge is developed for the continuous and controllable transfer of QD solution into ultrasmooth films by using a taut fiber with its two ends placed into capillary tubes. Guided along the fiber, a liquid bridge is formed between the horizontal fiber and the substrate, with a large mass of liquid steadily being held within the vertically placed tubes. Directionally moving the liquid bridge generates a high‐quality QD film on the substrate. Particularly, the liquid consumption is quantitative, namely, in proportion to the area of the as‐prepared film. Moreover, multilayered ultrasmooth red/green/blue QD films are prepared by multiple transfers of liquid onto the same targeted area in sequence. The as‐prepared white QLEDs show a rather high performance with a maximum luminance of 57 190 cd m −2 and a maximum current efficiency of 15.868 cd A −1 . It is envisioned that this strategy offers new perspectives for the low‐cost fabrication of high‐performance QLED devices.