Ultrahigh-resolution quantum-dot light-emitting diodes

Meng, Tingtao; Zheng, Yang; Zhao, Denglin; Hu, Hailong; Zhu, Yuan; Xu, Zhiai; Ju, Songman; Jing, Jipeng; Chen, Xiang; Gao, Hongjun; Yang, Kaiyu; Guo, Tailiang; Li, Fushan; Fan, Junpeng; Liu, Qian

doi:10.1038/s41566-022-00960-w

Cited by 121 publications

(108 citation statements)

References 42 publications

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“…The patterned QD down-conversion layer on blue light-emitting diodes (LEDs) renders high-color reproduction and ultra-high image quality in full-color displays 8,9 . Likewise, a laterally patterned array consisting of red, green, and blue (RGB) QD-LEDs, in which QDs convert electrically pumped charge carriers into photons, allows for excellent color gamut and brightness as well as light-weight, thin, and exible form factors [10][11][12][13] , which are suited for wearable neareye displays for virtual reality (VR) and augmented reality (AR) devices. For these "mixed-reality" applications, the QD deposition process should enable the patterning of RGB QDs (or RG QDs along with the bank) into a few micrometer sub-pixels over a large area with high-precision and high-delity 14,15 .…”

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confidence: 99%

Direct patterning of colloidal quantum dots with adaptable dual-ligand surface

et al. 2022

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Colloidal quantum dots (QDs) stand at the forefront of a variety of photonic applications given their narrow spectral bandwidth and near-unity luminescence e ciency. Integrating desired forms of QD lms into photonic systems without compromising their optical or transport characteristics is the key to bridging the gap between expectations and outcomes. Here, we devise a dual-ligand passivation system comprising photocrosslinkable ligands and dispersing ligands to enable QDs to be universally compatible with solution-based patterning techniques. The successful control on the structure of both ligands allows multiscale, direct patterning of the dual-ligand QDs on various substrates via commercialized photolithography (i-line) or inkjet printing systems without compromising the optical properties of QDs or the optoelectronic performances of the devices implementing them. Our approach offers a versatile way of creating various structures of luminescent QDs in a cost-effective and non-destructive manner, and thus enables the implementation of QDs in a range of photonic applications. MainColloidal quantum dots (QDs) are promising materials for use in next-generation light sources due to their wide-ranging bandgap tunability, narrow spectral bandwidths, and near-unity luminescence quantum yields (QY) [1][2][3][4][5] . Together with the capability of cost-effective solution processing, QDs have become the key light-emissive materials for information displays 3,5−7 . The patterned QD down-conversion layer on blue light-emitting diodes (LEDs) renders high-color reproduction and ultra-high image quality in full-color displays 8,9 . Likewise, a laterally patterned array consisting of red, green, and blue (RGB) QD-LEDs, in which QDs convert electrically pumped charge carriers into photons, allows for excellent color gamut and brightness as well as light-weight, thin, and exible form factors [10][11][12][13] , which are suited for wearable neareye displays for virtual reality (VR) and augmented reality (AR) devices. For these "mixed-reality" applications, the QD deposition process should enable the patterning of RGB QDs (or RG QDs along with the bank) into a few micrometer sub-pixels over a large area with high-precision and high-delity 14,15 . At the same time, the process should not disrupt the optical and transport characteristics of QDs and adjacent functional layers. Moreover, from a practical standpoint, it poses great bene t if one can use equipment that are already deployed in display device manufacturing steps for the patterning process.

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confidence: 99%

Direct patterning of colloidal quantum dots with adaptable dual-ligand surface

et al. 2022

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“…Li, Qian, and co-workers have realized quantum dot light-emitting diodes with an ultra-high resolution of 9072 to 25 400 pixels per inch using transfer printing and the LB film technology. 73 A non-emissive charge barrier layer of wide bandgap quantum dots arranged in a honeycomb shape between the quantum dot pixels reduces leakage current. Red and green quantum dot light-emitting diodes were demonstrated.…”

Section: Inorganic Nanomaterialsmentioning

confidence: 99%

Materials nanoarchitectonics in a two-dimensional world within a nanoscale distance from the liquid phase

Ariga

2022

Nanoscale

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“…24,25 With the viewing distance increasing, the visible limit of pixels is decreased, indicating the requirement of resolution is also gradually lowered, e.g., PPI of about 263 for computers (45 cm) and PPI of about 80 for televisions (TVs) (250 cm). 24,25 Given current techniques to realize high-definition displays, though tens of thousands of PPI have been attained, 14,20 fabrication cost has been especially high all the time, which is unbearable for mass production of mobile devices and household appliances. Therefore, it is particularly important to develop technologies, which are low-cost and can ensure PPI that meets the needs of the human eyes, e.g., 200-806 for mobile phones, 90-280 for computers, and 25-90 for TVs.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Meng et al in 2022 reported QLEDs with an ultrahigh PPI of 9072–25 400 via the transfer printing technique. 20 However, these process techniques mentioned above still face some challenges. In inkjet printing, QD patterns are easily formed by controlling solution deposition and position, but coffee rings are easy to form in printed films, affecting the performance of devices.…”

Section: Introductionmentioning

confidence: 99%