Double-heterojunction nanorod light-responsive LEDs for display applications

Oh, Nuri; Kim, Bong Hoon; Cho, Seong‐Yong; Nam, Sooji; Rogers, Stanley; Jiang, Yiran; Flanagan, Joseph C.; Zhai, You; Kim, Jaehwan; Lee, Jungyup; Yu, Yongjoon; Cho, Youn Kyoung; Hur, Gyum; Zhang, Jieqian; Trefonas, Peter; Rogers, John A.; Shim, Moonsub

doi:10.1126/science.aal2038

Cited by 216 publications

(213 citation statements)

References 22 publications

(13 reference statements)

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“…[74] This offers access to wavelengths that are not possible in either SC structure separately.A lthough type II systems are usually more suitable for applications which require charge separation (such as photocatalysis or charge-transfer processes), elevated external quantum efficiencies for at ype II system have been reported. [12] An interesting intermediate case is the quasi type II system. Theb and alignment of the core and the shell are straddled, but the band offset of one of the bands (CB or VB) is small.…”

Section: Heterostructured Scncsmentioning

confidence: 99%

“…SCNC heterostructures comprised of different shapes and dimensionalities also offer advantages and opportunities in the facilitation of charge injection or extraction of both carrier types from different regions.O ne kind of such structure is ad umbbell-shaped NC.U nlike core-shell NCs, where at least one of the charge carriers is in an inaccessible region (irrelevant if it is atype Iortype II NC), in adumbbellshaped NC,b oth of the charge carriers can be found in directly accessible regions.D HNR (double heterojunction nanorod) dumbbells comprised of CdSe tips at the end of aCdS rod and over-coated with aZnSe shell, [40] were found to be very efficient both as an emissive layer for electroluminescent QD LED displays and as alight detector. [12] This opened the possibility of multifunctional displays (see Section 7). Recently,Z nTe/ZnSe nanodumbbells (NDBs) were presented where the fluorescence could be tuned between Figure 6.…”

Section: Dimension and Dimensionality Effectsmentioning

confidence: 99%

“…[11] Since then, SCNCs have been used in down-converting backlight applications in LCDs as well as in electroluminescent displays. [12][13][14][15][16] Besides using size to control their optical and electronic properties,S CNCs can be synthesized in av ariety of shapes and dimensionalities (see below); [17][18][19][20][21][22] these characteristics govern the polarization and the directionality of the emission of the NCs.T he surface of the NCs is easily processed, and hence NCs can be introduced onto various phases/substrates such as hydrophobic or hydrophilic media, and onto or into flexible or rigid substrates. [23][24][25][26] These qualities also make NCs appealing in av ariety of additional applications,s uch as sensing, [27] imaging and bio-labeling, [28][29][30] solar cells, [31,32] lasing, [33,34] photocatalysis, [35] and printed electronics.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal Quantum Nanostructures: Emerging Materials for Display Applications

2018

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Colloidal semiconductor nanocrystals (SCNCs) or, more broadly, colloidal quantum nanostructures constitute outstanding model systems for investigating size and dimensionality effects. Their nanoscale dimensions lead to quantum confinement effects that enable tuning of their optical and electronic properties. Thus, emission color control with narrow photoluminescence spectra, wide absorbance spectra, and outstanding photostability, combined with their chemical processability through control of their surface chemistry leads to the emergence of SCNCs as outstanding materials for present and next‐generation displays. In this Review, we present the fundamental chemical and physical properties of SCNCs, followed by a description of the advantages of different colloidal quantum nanostructures for display applications. The open challenges with respect to their optical activity are addressed. Both photoluminescent and electroluminescent display scenarios utilizing SCNCs are described.

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Section: Heterostructured Scncsmentioning

confidence: 99%

Section: Dimension and Dimensionality Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Colloidal Quantum Nanostructures: Emerging Materials for Display Applications

2018

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“…2k, l). [53][54][55] In this structure, two CdSe emitters are directly connected to CdS nanorods and the remaining surface of CdSe is passivated by ZnSe. Remarkably, the obtained peak EQE (12%) was higher than the expected upper limit (8%) considering their PLQY (40%).…”

Section: Materials Design For Efficient Qledsmentioning

confidence: 99%

Flexible quantum dot light-emitting diodes for next-generation displays

et al. 2018

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In the future electronics, all device components will be connected wirelessly to displays that serve as information input and/or output ports. There is a growing demand of flexible and wearable displays, therefore, for information input/output of the nextgeneration consumer electronics. Among many kinds of light-emitting devices for these next-generation displays, quantum dot light-emitting diodes (QLEDs) exhibit unique advantages, such as wide color gamut, high color purity, high brightness with low turn-on voltage, and ultrathin form factor. Here, we review the recent progress on flexible QLEDs for the next-generation displays. First, the recent technological advances in device structure engineering, quantum-dot synthesis, and high-resolution full-color patterning are summarized. Then, the various device applications based on cutting-edge quantum dot technologies are described, including flexible white QLEDs, wearable QLEDs, and flexible transparent QLEDs. Finally, we showcase the integration of flexible QLEDs with wearable sensors, micro-controllers, and wireless communication units for the next-generation wearable electronics.

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“…Alternatively, other inorganic electronic materials, such as nanoparticles [19][20][21] and carbon nanotubes, [22][23][24] are deposited on elastomer substrates to form a thin nanopath that can be extended when the substrates are stretched. [29][30][31] However, the conductivities of nanoparticle layers and organic electronic materials are far lower than those of metal conductors. [21] Meanwhile, organic electronic materials, such as conductive small molecules and polymers and carbon-based conductive materials, [28] have good stretchability and their special chemical groups provide good conductivity.…”

mentioning

confidence: 99%

Semi‐Liquid‐Metal‐(Ni‐EGaIn)‐Based Ultraconformable Electronic Tattoo

Guo

Sun

Yao

et al. 2019

Adv Materials Technologies

124

129

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silicon wafer, electronic skin, which is usually fabricated with mechanically compliant materials (low modulus, stretchable, and flexible) overcomes the fundamental mismatch between rigid devices and soft biological tissues. [13,14] At present, inorganic and organic electronic materials integrated with elastomeric substrates are the two popular approaches to fabricate electronic skin. Nonstretchable inorganic electronic materials, such as gold, copper, and silver, change the geometric structure to fit the stretched substrates. [15][16][17][18] It is obvious that the complicated, expensive fabrication methods, and limited stretchability of inorganic electronic materials restrict their widespread application. Alternatively, other inorganic electronic materials, such as nanoparticles [19][20][21] and carbon nanotubes, [22][23][24] are deposited on elastomer substrates to form a thin nanopath that can be extended when the substrates are stretched. With low-cost fabrication methods, such as direct printing [20,25] and transfer printing, [21] these materials have been highly successfully used to fabricate stretchable circuits, [26] sensing arrays, [27] and near field communication antennae. [21] Meanwhile, organic electronic materials, such as conductive small molecules and polymers and carbon-based conductive materials, [28] have good stretchability and their special chemical groups provide good conductivity. [29][30][31] However, the conductivities of nanoparticle layers and organic electronic materials are far lower than those of metal conductors. Thus, it is of great importance to develop new materials with both excellent conductivity and stretchability. Most electronic skin is fabricated on a flat device and subsequently transferred to skin. We suggest that the new conductive materials be directly printed onto the skin using a low-cost preparation method and be super-compliant and customizable.Liquid metal (eutectic gallium-indium, EGaIn) is an attractive conductive material that has shown significant promise for broad applications in flexible electronics. With its high electrical conductivity (EGaIn: 3.4 × 10 6 S m −1 ) [32] and excellent fluidity, [33] liquid metal has attracted great interest in many applications, such as stretchable antennae, [34,35] bioelectrodes, [36] strain sensors, [37] pressure sensors, [38] loudspeakers, [39] and soft robots. [40] Additionally, gallium is nontoxic with low vapor pressure, [41] which can be useful in an ambient environment. [42] Meanwhile, various patterning techniques of liquid metal have also been developed, such as microchannel injection, [43] atomized Because of its seamless skin interface, electronic skin has attracted increasing attention in the field of biomedical sensors and medical devices. Most electronic skins are based on organic or inorganic electronic materials. However, the low flexibility of inorganic materials and the limited conductivity of organic materials restricts their widespread use. A new approach is reported to fabricate electronic tattoos from N...

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Double-heterojunction nanorod light-responsive LEDs for display applications

Cited by 216 publications

References 22 publications

Colloidal Quantum Nanostructures: Emerging Materials for Display Applications

Colloidal Quantum Nanostructures: Emerging Materials for Display Applications

Flexible quantum dot light-emitting diodes for next-generation displays

Semi‐Liquid‐Metal‐(Ni‐EGaIn)‐Based Ultraconformable Electronic Tattoo

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