High efficiency green InP quantum dot light-emitting diodes by balancing electron and hole mobility

Chao, Wei-Chih; Chiang, Tsung‐Yu; Liu, Yichun; Huang, Zhi-Xuan; Liao, Chien Chang; Chu, Chen-Hsien; Wang, Chih-Hsing; Tseng, H.W.; Hung, Wen‐Yi; Chou, Pi‐Tai

doi:10.1038/s43246-021-00203-5

Cited by 80 publications

(47 citation statements)

References 58 publications

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“…Finally, the EQE of the fabricated inverted InP QLEDs exceeds 7%, which is the highest EQE record currently reported based on the

synthesis route. Recently, Chao et al synthesized green InP/ZnSe/ZnS QDs with a PLQY of 86% [ 24 ]. Then they modified the InP QD emitting layer by passivation with various alkyl diamines and zinc halides, and a record 16.3% EQE of green QLEDs was achieved.…”

Section: Influence Of Core/shell Structure On Performance Of Inp Qledsmentioning

confidence: 99%

“…Won et al replaced the oleic acid ligand on the surface of the quantum dots with a shorter chain length hexanoic acid (HA), and the device hole current of the short ligand QDs increases fourfold, promotes exciton recombination, and reduces Auger recombination, and the EQE of the device increases to 21.4% [ 6 ]. In 2021, a high EQE of 16.3% for InP QLEDs was obtained based on the modification of surface ligands and the ZnI 2 precursor, which is the record EQE value of green InP QLEDs up to now [ 24 ]. In this work, a shorter chain (BDA) was used to strengthen the molecular bonds between QDs and control carrier transfer at the QDs interface, and hole injection and mobility were modified; the schematic diagram of the reaction is shown in Figure 10 .…”

Section: Influence Of Core/shell Structure On Performance Of Inp Qledsmentioning

confidence: 99%

“…InP QLEDs show great potential in the field of lighting display, due to their environmental friendliness, low toxicity, and excellent optoelectronic properties. The currently reported maximum EQEs of RGB InP QLEDs are 21.8%, 16.3%, and 2.8% [ 23 , 24 , 26 ], respectively. Though the EL performance of red QLED can be comparable to that of Cd-based QLEDs, the EL characteristics of green and blue QLEDs are still far from those of Cd-based QLEDs.…”

Section: Challenge and Future Directionmentioning

confidence: 99%

“…InP QDs have become an ideal candidate for replacing heavy-metal Cd-based QDs [ 21 , 22 ]. With systematic investigation of mechanism and device physics and the rapid development of materials and device fabrication technologies, the electroluminescence (EL) efficiency of red InP QLEDs has been greatly improved and is comparable to that of Cd-based QLEDs [ 6 , 23 , 24 , 25 ]. In 2019, Jang et al achieved a red InP device with an external quantum efficiency (EQE) of 21.4% and an operational lifetime over 100,000 h [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…In 2019, Jang et al achieved a red InP device with an external quantum efficiency (EQE) of 21.4% and an operational lifetime over 100,000 h [ 6 ]. In 2021, Chou et al reported a green InP device with 16.3% EQE [ 24 ]. The EQE of blue InP QLEDs is only 2.8% [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Advances and Challenges in Heavy-Metal-Free InP Quantum Dot Light-Emitting Diodes

et al. 2022

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Light-emitting diodes based on colloidal quantum dots (QLEDs) show a good prospect in commercial application due to their narrow spectral linewidths, wide color range, excellent luminance efficiency, and long operating lifetime. However, the toxicity of heavy-metal elements, such as Cd-based QLEDs or Pb-based perovskite QLEDs, with excellent performance, will inevitably pose a serious threat to people’s health and the environment. Among heavy-metal-free materials, InP quantum dots (QDs) have been paid special attention, because of their wide emission, which can, in principle, be tuned throughout the whole visible and near-infrared range by changing their size, and InP QDs are generally regarded as one of the most promising materials for heavy-metal-free QLEDs for the next generation displays and solid-state lighting. In this review, the great progress of QLEDs, based on the fundamental structure and photophysical properties of InP QDs, is illustrated systematically. In addition, the remarkable achievements of QLEDs, based on their modification of materials, such as ligands exchange of InP QDs, and the optimization of the charge transport layer, are summarized. Finally, an outlook is shown about the challenge faced by QLED, as well as possible pathway to enhancing the device performance. This review provides an overview of the recent developments of InP QLED applications and outlines the challenges for achieving the high-performance devices.

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“…Finally, the EQE of the fabricated inverted InP QLEDs exceeds 7%, which is the highest EQE record currently reported based on the

Section: Influence Of Core/shell Structure On Performance Of Inp Qledsmentioning

confidence: 99%

Section: Influence Of Core/shell Structure On Performance Of Inp Qledsmentioning

confidence: 99%

Section: Challenge and Future Directionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advances and Challenges in Heavy-Metal-Free InP Quantum Dot Light-Emitting Diodes

et al. 2022

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Perovskite Quantum Dots for the Next‐Generation Displays: Progress and Prospect

Shan,

Dong,

Xiang

et al. 2024

Adv Funct Materials

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The “Nobel Prize in Chemistry 2023” is awarded to Moungi G. Bawendi, Louis E. Brus, and Alexey I. Yekimov for discovering and synthesizing Quantum Dots (QDs). Colloidal QDs possess fascinating size‐, morphological‐, composition‐, and assembly‐tunable electronic and optical properties, which makes them star materials for various optoelectronic applications, especially as luminescent materials for next‐generation wide color gamut ultra‐high‐definition displays. Perovskite QDs (PQDs) have gained widespread attention in recent years. In less than ten years, research on perovskite‐related materials and devices has basically been perfected in terms of quantum yield and external quantum efficiency (EQE). However, on the eve of its industrial application, some key technical indicators and technical processes need to be met and resolved. The development and transformation of QD materials and then focuses on the progress of luminescence linewidth and EQE of the PQD light‐emitting diode. Finally, several application avenues are reviewed for PQDs, and some challenges and opportunities in the field are proposed.

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Flexible Quantum Dot Light‐Emitting Device for Emerging Multifunctional and Smart Applications

et al. 2023

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Quantum dot light‐emitting diodes (QLEDs), owing to their exceptional performances in device efficiency, color purity/tunability in the visible region and solution‐processing ability on various substrates, become a potential candidate for flexible and ultrathin electroluminescent (EL) lighting and display. Moreover, beyond the lighting and display, flexible QLEDs are enabled with endless possibilities in the era of the internet of things and artificial intelligence by acting as input/output ports in wearable integrated systems. Challenges remain in the development of flexible QLEDs with the goals for high performance, excellent flexibility/even stretchability, and emerging applications. In this paper, the recent developments of QLEDs including quantum dot materials, working mechanism, flexible/stretchable strategies and patterning strategies, and highlight its emerging multifunctional integrations and smart applications covering wearable optical medical devices, pressure‐sensing EL devices, and neural smart EL devices, are reviewed. The remaining challenges are also summarized and an outlook on the future development of flexible QLEDs made. The review is expected to offer a systematic understanding and valuable inspiration for flexible QLEDs to simultaneously satisfy optoelectronic and flexible properties for emerging applications.

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High efficiency green InP quantum dot light-emitting diodes by balancing electron and hole mobility

Cited by 80 publications

References 58 publications

Advances and Challenges in Heavy-Metal-Free InP Quantum Dot Light-Emitting Diodes

Advances and Challenges in Heavy-Metal-Free InP Quantum Dot Light-Emitting Diodes

Perovskite Quantum Dots for the Next‐Generation Displays: Progress and Prospect

Flexible Quantum Dot Light‐Emitting Device for Emerging Multifunctional and Smart Applications

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