HomeNewsNanotechnologyUsing the precept behind espresso ring impact in quantum dot arrays

Using the precept behind espresso ring impact in quantum dot arrays


Schematic through which quantum dots enter the V-shaped construction (left) and a schematic picture of RGB QD pixels created utilizing the strategy (proper). Credit: POSTECH

If spilled espresso just isn’t instantly wiped off, it leaves behind a stain the place the perimeters are darker than the remainder. This phenomenon is known as the espresso ring impact. Using this precept, a POSTECH analysis staff has just lately developed a brand new methodology for arranging quantum dots (QDs) that are nanosized semiconducting crystals. This new easy methodology facilitates the event of show panels with as much as 20 instances larger decision than the standard ones.


A POSTECH analysis staff—led by Professor Junsuk Rho of the Department of Mechanical Engineering and Chemical Engineering, professors HangJin Jo and Moo Hwan Kim of the Division of Advanced Nuclear Engineering and Department of Mechanical Engineering, Taeyang Han of the Division of Advanced Nuclear Engineering, and Ph.D. candidate Jaebum Noh within the Department of Mechanical Engineering—developed a QD array utilizing a phenomenon that happens when a suspension evaporates. Suspension refers to a liquid through which are dispersed and suspended as in muddy water, ink, or paint.

QDs, that are a number of nanometers in dimension, comply with the stream of a fluid very properly. Just as espresso stains are left when a drop runs on the facet of a cup, when a suspension containing QDs evaporates, the particles routinely assemble in sure areas like the sting of a liquid drop induced by capillary stream.

Many makes an attempt have been made to benefit from this property, however buying brightness appropriate for shows have been troublesome. The price of the product was additionally excessive as a result of QDs had been printed straight on the substrate utilizing costly gear.

To overcome this limitation, the researchers organized the QDs within the type of very small pixels in the course of the suspension evaporation course of utilizing a V-shaped construction. When the liquid is poured and evaporated, the QDs are pushed towards the interior suggestions of the V-shape and accumulate there.

The outcomes revealed that the brightness of the QD pixels produced on this method was 20 instances brighter than that of the management group and confirmed excessive uniformity price of over 98%.

“Recently, the home appliance industry is using QDs in color filters in televisions for bright and natural images,” remarked professors Junsuk Rho and HangJin Jo. “Using the QD pixel array methodology developed on this examine, brilliant QD pixels are created by merely spraying the suspension with out costly gear, thus lowering the manufacturing price.

The analysis was printed in ACS Applied Materials and Interfaces.


International team uncovers mystery behind ‘coffee ring’ formation


More data:
Taeyang Han et al, Pixelated Microsized Quantum Dot Arrays Using Surface-Tension-Induced Flow, ACS Applied Materials & Interfaces (2021). DOI: 10.1021/acsami.1c14857

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Pohang University of Science & Technology (POSTECH)

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Using the precept behind espresso ring impact in quantum dot arrays (2021, November 24)
retrieved 24 November 2021
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