Low-Temperature Cross-Linkable Hole Transport Materials for Solution-Processed Quantum Dot and Organic Light-Emitting Diodes with High Efficiency and Color Purity

Maheshwaran, Athithan; Bae, Hyejeong; Park, Jaehyoung; Jung, Hyeonwoo; Hwang, Youngjun; Kim, Jongyoun; Park, Chaehyun; Kang, Byeongjae; Song, Myungkwan; Lee, Youngu

doi:10.1021/acsami.3c09106

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Cross-linked hole transport materials are usually achieved by introducing cross-linked groups into organic semiconductor molecules. − Besides, insoluble films are obtained by forming new covalent bonds between molecules through thermal or light activation . Unfortunately, thermal cross-linking processes usually require treatment at temperatures higher than 150 °C for 30–60 min, which not only damage the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT/PSS) but is also unsuitable for many soft substrates. , In this regard, photo-cross-linking is a very attractive alternative method to overcome these limitations and enable micro pixel patterns using standard photolithography. , However, to achieve the photo-cross-linking, a large number of photoinitiators are often necessary, which also hinder the transport capacity of the hole transport layers (HTLs) and ultimately reduce the device performance.…”

Section: Introductionmentioning

confidence: 99%

Photothermal Synergic Cross-Linking Hole Transport Layer for Highly Efficient RGB QLEDs

Li,

Wang,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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Developing an insoluble cross-linkable hole transport layer (HTL) plays an important role for solution-processed quantum dots light-emitting diodes (QLEDs) to fabricate a multilayer device with separated quantum dots layers and HTLs. In this work, a facile photothermal synergic cross-linking strategy is simultaneous annealing and UV irradiation to form the high-quality cross-linked film as the HTL without any photoinitiator, which efficiently reduces the cross-linking temperature to the low temperature of 130 °C and enhances the hole mobility of the 3-vinyl-9-{4-[4-(3-vinylcarbazol-9-yl)phenyl]phenyl}carbazole (CBP-V) thin films. The obtained high-quality cross-linked CBP-V films exhibited smooth morphology, excellent solvent resistance, and high mobility. Moreover, the high-performance red, green, and blue (RGB) QLEDs are successfully fabricated by using the photothermal synergic cross-linked HTLs, which achieved the maximum external quantum efficiency of 25.69, 24.42, and 16.51%, respectively. This work presents a strategy of using the photothermal synergic cross-linked HTLs for fabrication of high-performance QLEDs and advancing their related device applications.

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Section: Introductionmentioning

confidence: 99%

Photothermal Synergic Cross-Linking Hole Transport Layer for Highly Efficient RGB QLEDs

Li,

Wang,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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show abstract

“…Otherwise, the partial dissolution of underneath layers may cause severe nonemissive recombination problems in QLEDs . An effective way to avoid interlayer mixing is to utilize the orthogonal solvents, but this approach restricts the choice of solvents for hole transport layers (HTLs) and quantum dots (QDs). − As such, the use of cross-linkable materials to prepare HTLs is a promising strategy that allows for the production of films with excellent solvent resistance, without limiting the solvents used in subsequent layer deposition. − Therefore, the development of cross-linkable HTLs is necessary for solution-processed QLEDs.…”

mentioning

confidence: 99%

Low-Temperature Cross-Linked Hole Transport Layer for High-Performance Blue Quantum-Dot Light-Emitting Diodes

Li,

Zheng,

Liu

et al. 2024

Nano Lett.

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Quantum-dot light-emitting diodes (QLEDs), a kind of promising optoelectronic device, demonstrate potential superiority in next-generation display technology. Thermal cross-linked hole transport materials (HTMs) have been employed in solutionprocessed QLEDs due to their excellent thermal stability and solvent resistance, whereas the unbalanced charge injection and high crosslinking temperature of cross-linked HTMs can inhibit the efficiency of QLEDs and limit their application. Herein, a low-temperature crosslinked HTM of 4,4′-bis(3-(((4-vinylbenzyl)oxy)methyl)-9H-carbazol-9-yl)-1,1′-biphenyl (DV-CBP) with a flexible styrene side chain is introduced, which reduces the cross-linking temperature to 150 °C and enhances the hole mobility up to 1.01 × 10 −3 cm 2 V −1 s −1 . More importantly, the maximum external quantum efficiency of 21.35% is successfully obtained on the basis of the DV-CBP as a crosslinked hole transport layer (HTL) for blue QLEDs. The low-temperature cross-linked high-mobility HTL using flexible side chains could be an excellent alternative for future HTL development.

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Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers

Yang,

Zhang,

Zhang

et al. 2024

OEA

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Thermal management of nanoscale quantum dots (QDs) in light-emitting devices is a long-lasting challenge. The existing heat transfer reinforcement solutions for QDs-polymer composite mainly rely on thermal-conductive fillers. However, this strategy failed to deliver the QDs' heat generation across a long distance, and the accumulated heat still causes considerable temperature rise of QDs-polymer composite, which eventually menaces the performance and reliability of lightemitting devices. Inspired by the radially aligned fruit fibers in oranges, we proposed to eliminate this heat dissipation challenge by establishing long-range ordered heat transfer pathways within the QDs-polymer composite. Ultrahigh molecular weight polyethylene fibers (UPEF) were radially aligned throughout the polymer matrix, thus facilitating massive efficient heat dissipation of the QDs. Under a UPEF filling fraction of 24.46 vol%, the in-plane thermal conductivity of QDs-radially aligned UPEF composite (QDs-RAPE) could reach 10.45 W m −1 K −1 , which is the highest value of QDs-polymer composite reported so far. As a proof of concept, the QDs' working temperature can be reduced by 342.5 °C when illuminated by a highly concentrated laser diode (LD) under driving current of 1000 mA, thus improving their optical performance. This work may pave a new way for next generation high-power QDs lighting applications.

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Low-Temperature Cross-Linkable Hole Transport Materials for Solution-Processed Quantum Dot and Organic Light-Emitting Diodes with High Efficiency and Color Purity

Cited by 3 publications

References 45 publications

Photothermal Synergic Cross-Linking Hole Transport Layer for Highly Efficient RGB QLEDs

Photothermal Synergic Cross-Linking Hole Transport Layer for Highly Efficient RGB QLEDs

Low-Temperature Cross-Linked Hole Transport Layer for High-Performance Blue Quantum-Dot Light-Emitting Diodes

Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers

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