Laser & Photonics Reviews
·
2026
·
IF 9.7
Yixuan Li,Zhanpeng Qin,Xianlong Wang,Tianhao Wang,Yaxin Li,Yanliu Zhu,Dewang Li,Shirong Wang,Hongli Liu
Insufficient hole injection remains a critical bottleneck hindering the commercialization of blue quantum dot light-emitting diodes (QLEDs), making the optimization of hole transport behavior highly significant. Herein, (2-(9 H -carbazol-9-yl)ethyl)phosphonic acid (2PACz) is incorporated into poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) to construct a composite hole injection layer (HIL). Within this composite layer, a portion of 2PACz anchors onto the ITO surface, while a portion engages in π – π interactions with hole transport layer (HTL) poly(9-vinylcarbazole), giving rise to a synergistic dual-interface modification effect that substantially enhances interfacial hole injection and transport. The overall hole mobility of the HIL/HTL stack increases markedly from 2.15 × 10 −7 to 7.84 × 10 −6 cm 2 V −1 s −1 . Meanwhile, the introduction of 2PACz raises the electrical conductivity of the HIL from 2.51 × 10 −4 to 5.35 × 10 −4 mS cm −1 and deepens its HOMO level from −5.15 to −5.48 eV, thereby further facilitating hole injection into the HTL. Consequently, deep-blue QLEDs employing this composite HIL achieve a remarkable maximum luminance of 11,185.50 cd m −2 , a high external quantum efficiency of 22.61% with a CIE y coordinate of 0.0305, and an extended lifetime of 793.19 h ( T 50 @100 cd m −2 ), representing a significant improvement in optoelectronic performance.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 3
·2308341
·
IF 19
Mingyang Li,Jindi Wang,Jisong Yao,Shalong Wang,Leimeng Xu,Jizhong Song
Although significant progress has been made in improving the external quantum efficiencies (EQEs) of perovskite quantum dot (QD) light-emitting diodes (QLEDs), understanding the degradation mechanism and enhancing stability remain a challenge. Herein, increasing the content of Br-based passivation ligands is shown to enhance the EQE up to 16.1% by reducing the defects of CsPbBr 3 QDs in a Br-rich environment. However, the operational lifetimes of perovskite QLEDs gradually decrease with the increase of halide content, owing to the intensified ion migration under continuous electric field confirmed by the current behavior of QLEDs and time-of-flight secondary-ion mass spectrometry. Furthermore, a thorough analysis of the relationship between electricity and luminance of QLEDs suggests that a small amount of residue oleic acid ligands could weaken ion migration. Accordingly, a halide- and acid-hybrid (HAH) co-passivation strategy is proposed to optimize the content of Br- and acid-based ligands, and achieve a maximum EQE of 18.6% and an operational lifetime ( T 50 , extrapolated) of 213 h for CsPbBr 3 QLEDs. This approach for passivating QDs combines the high efficiency of Br-based ligands with the improved stability of acid-based ligands. The study elucidates the correlation between ligands and device performance, highlighting the significance of two or even multiple ligands for efficient and stable perovskite QLEDs.
研究领域:
材料科学
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光电子学
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纳米技术
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高影响因子
Interdisciplinary Materials
·
2024
·
IF 24.5
Hanwen Zhu,Guoqing Tong,Junchun Li,Xuyong Tao,Yang Shen,Yuanyuan Sheng,Lin Shi,Fengming Xie,Jianxin Tang,Yang Jiang
Low efficiency and spectral instability caused by the surface defects have been considerable issues for the mixed-halogen blue emitting perovskite quantum dots light-emitting diodes (PeQLEDs). Here, an in situ surface passivation to perovskite quantum dots (PeQDs) is realized by introducing the metal cations competitive lattice occupancy assisted with acid-etching, in which the long-chain, insulating and weakly bond surface ligands are removed by addition of octanoic acid (OTAC). Meanwhile, the dissolved A-site cations (Na + ) compete with the protonated oleyl amine and are subsequently anchored to the surface vacancies. The preadded lead bromide, acting as inorganic ligands, demonstrates strong bonding to the uncoordinated surface ions. The as-synthesized PeQDs show the boosted photoluminescence quantum yield (PLQY) and superior stability with longer lifetime. As a result, the PeQLEDs (470 nm) based on the OTAC-Na PeQDs exhibit an external quantum efficiency of 8.42% in the mixed halogen PeQDs (CsPb(Br x Cl 1− x ) 3 ). Moreover, the device exhibits superior spectra stability with negligible shift. Our competition mechanism in combination with in situ passivation strategy paves a new way for improving the performance of blue PeQLEDs.
研究领域:
材料科学
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纳米技术
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光电
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·9795-9803
·
IF 2.478
Wei Song,Miao Juhong,Shi Qiuwei,Shao Shaofeng,Zhang Lei
In order to obtain improvement in efficiency and stability of quantum dot light-emitting diodes (QLEDs), it is essential to seek carrier transport layer with higher carrier transport efficiency and better air stability. In terms of the high-performance carrier transport layer, solution-processed inorganic metal oxides show promise for efficient QLEDs because of their suitable energy band, high carrier mobility, especially their outstanding air stability. In this study, we employed high-quality oleic acid-capped TiO 2 nanocrystals as the electron transportation layer to fabricate air-stable inverted QLEDs. These TiO 2 nanocrystals have narrow size distribution, outstanding crystalline property, especially excellent air stability. To improve the interfacial carrier transportation performance of oleic acid-capped TiO 2 nanocrystals, we introduce a thionyl chloride (SOCl 2 ) post-ligand exchange process that replaces organic long-chain ligands with single inorganic ligands efficiently. The stability of oleic acid-capped TiO 2 -based QLEDs were evaluated by comparing with the traditional ZnO-based QLEDs. As a result, oleic acid-capped TiO 2 nanoparticles show excellent long-term air stability. This study offers an alternative strategy to deal with the stability issue of optoelectronic devices.
研究领域:
材料科学
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电子工程
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高影响因子
Science Bulletin
·
2025
·
IF 21.1
Tianjun Hu,Xiuting Wu,Qingsong Shan,Xingxing Duan,Xiaoyue Cai,Mengjin Huang,Junhui Dai,Hong Zhong,Beichen Yuan,Hengyang Xiang,Linxiang Yang,Qiangyu Dai,Yuhao Zhang,Jiangshan Chen,Haibo Zeng
Developing single-pixel color-tunable electroluminescence technology represents a practical approach to circumvent current limitations in pixel processing and longevity. However, existing single-pixel color-tunable quantum dot light-emitting diodes (QLEDs) devices predominantly employ complex tandem structures. Herein, we demonstrate single-layer color-tunable QLEDs by the real-time interface exciplex modulation with AgInZnS (AIZS) quantum dots (QDs). The dynamically color-tunable QLEDs based on green- and red-emitting AIZS QDs exhibit broad spectral coverage, spanning from green to blue, red to yellow, with standard white emission, respectively. The fabricated devices achieve a leading maximum external quantum efficiency of 5% for quaternary alloy AIZS-based QLEDs. Furthermore, we successfully demonstrate patterned and large-area QLEDs, systematically confirming their significant potential for application in full-color display and lighting technologies.
研究领域:
光电子学
·
量子点技术
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显示技术
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发光二极管
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材料科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 15
·5849-5855
·
IF 8.067
Qiang Zhang,Minghui Jiang,Guijun Yan,Yaqing Feng,Bao Zhang
All-inorganic CsPbBr3 perovskite quantum dots (CsPbBr3 QDs) have become one of the most promising materials in the field of optoelectronics. However, the poor stability and low photoluminescence quantum yield (PLQY) of CsPbBr3 QDs hinder their further applications. Herein, fluorinated aromatic ammonium bromide (fluorophenethyl ammonium bromide, FPEABr) is introduced in the synthesis of CsPbBr3 QDs. The influence of the fluorination position (ortho, meta, and para) at the benzene ring on the optical properties and stability of CsPbBr3 is systematically evaluated. The results indicate that the short fluorinated aromatic alkyl ammonium chain has been successfully adsorbed onto the surface of CsPbBr3 QDs, and the bromine vacancy defects have been significantly reduced. Eventually, stable CsPbBr3 QDs with a high PLQY (>90%) are achieved with the use of pFPEABr. Furthermore, the short chains of the ligand improved the carrier transport in the CsPbBr3 QD film, and thus the surface treatment increases the maximum luminance of the corresponding perovskite quantum dot light-emitting diodes (QLEDs) from 531 to 1278 cd m−2. The surface ligand engineering strategy involving the FPEABr ligand, in particular pFPEABr, actually provides a new direction for the future development of high-performance QLEDs.
研究领域:
材料科学
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光学
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电子工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zilei Liu,Feng Li,Gaoxiang Huang,Feng Zhao,Weiwei Zhang,Guangyu Jiang,Sunhuizi Cheng,Zixin Fang,Quanshui Zhu,Yan Huang
Perovskite quantum dots (PQDs) suffer from the long-time stability owing to their strong ionic structure. Wrapping them with silica or doping them with ions have been used to improve their structural stabilities. Here, transitional metal doping and surface engineering are employed to synthesize silica-coated Mn:CsPbCl 3 QDs for the fabrication of photoluminescent QD-based light-emitting diodes (QLEDs). The as synthesized QDs have dual emission, one is the intrinsic emission of the perovskite host, and the other is the Mn-related emission. The as synthesized Mn-doped CsPbCl 3 exhibit improved stability of luminous spectra compared to those of the pure ones. We also integrate the silica-coated Mn:CsPbCl 3 QDs as color converters with a purple chip. The luminous spectra of the photoluminescent QD-based light-emitting diodes (QLEDs) can be adjusted by controlling the QD concentration. Twenty-day observation and measurement show that devices based on the silica-coated Mn:CsPbCl 3 exhibit enhanced performance stabilities, including a maximum CRI fluctuation of 2.3, a maximum CCT fluctuation of 7 K and a maximum LER fluctuation of 5.2 lm/W opt . These results indicate that manganese doping and silica shell are helpful for the stability improvement of perovskite QDs, and the potential applications of silica-coated Mn:CsPbCl 3 QDs in lighting fields.
研究领域:
材料科学
·
光电技术
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纳米技术
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DOI
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Jiangyuan Jiang,Shuai Zhang,Qingsong Shan,Linxiang Yang,Jing Ren,Yongjin Wang,Seokwoo Jeon,Hengyang Xiang,Haibo Zeng
White light-emitting diodes (WLEDs) are the key components in the next-generation lighting and display devices. The inherent toxicity of Cd/Pb-based quantum dots (QDs) limits the further application in WLEDs. Recently, more attention is focused on eco-friendly QDs and their WLEDs, especially the phosphor-free WLEDs based on mono-component, which profits from bias-insensitive color stability. However, the imbalanced carrier distribution between red-green-blue luminescent centers, even the absence of a certain luminescent center, hinders their balanced and stable photoluminescence/electroluminescence (PL/EL). Here, an In 3+ -doped strategy in Zn-Cu-Ga-S@ZnS QDs is first proposed, and the balanced carrier distribution is realized by non-equivalent substitution and In 3+ doping concentration modulation. The alleviation of the green emitter by the In 3+ -related red emitter and the compensation of blue emitter by the Zn-related electronic states contribute to the balanced red-green-blue emitting with high PL quantum yield (PLQY) of 95.3% and long lifetime (T 90 ) of over 1100 h in atmospheric conditions. Thus, the In 3+ -doped WLEDs can achieve exceedingly slight proportional variations between red-green-blue EL intensity over time (∆CIE = (0.007, 0.009)), and high champion CRI of 94.9. This study proposes a single-component QD with balanced and stable red-green-blue PL/EL spectrum, meeting the requirements of lighting and display.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Mengxin Liu,Desheng Li,Xinan Shi,Bingsuo Zou,Kai Chen,Daocheng Pan
The development of efficient and stable hole injection layers (HILs) remains a critical challenge for high-performance quantum-dot light-emitting diodes (QLEDs), as the conventional PEDOT:PSS suffers from inherent acidity and hygroscopicity. Herein, we demonstrate a novel strategy of molecular vibration engineering by employing deuterated self-assembled monolayers (SAMs) as an efficient alternative. The designed deuterated molecular backbone (Ph-4PACzd10), featuring extended conjugated structures, not only delivers an enhanced molecular dipole moment to significantly deepen the work function of ITO, but also effectively suppresses high-frequency C─H stretching vibrations through isotopic substitution, which promotes highly ordered molecular packing and superior film morphology, thereby minimizing interfacial energetic disorder and non-radiative recombination losses. As a result, SnO 2 -based QLEDs utilizing Ph-4PACzd10 achieve a record-breaking external quantum efficiency (EQE) of 30.87%, markedly surpassing that of the conventional PEDOT:PSS-based device (24.03%). Furthermore, the hydrophobic nature of the deuterated SAMs endows the devices with exceptional shelf and operational stability. Notably, the QLED device demonstrated excellent efficiency roll-off characteristics, maintaining an EQE exceeding 20% at an ultra-high luminance of 250 000 cd m −2 , with no positive aging effect observed. This work illustrates that isotopic engineering of molecular vibrations provides a compelling pathway to tailor interfacial energetics and advance the design principles for next-generation QLEDs.
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高影响因子
Advanced Science
·
2022
·Vol. 9
·期 23
·2200450
·
IF 17.521
Xinyu Zhang,Dewang Li,Zhenhu Zhang,Hongli Liu,Shirong Wang
The inadequate hole injection limits the efficiency and lifetime of the blue quantum dot light-emitting diodes (QLEDs), which severely hampers their commercial applications. Here a new discotic molecule of 3,6,10,11-tetrakis(pentyloxy)triphenylene-2,7-diyl bis(2,2-dimethylpropanoate) (T5DP-2,7) is introduced, in which the hole transport channels with superior hole mobility (2.6 × 10 –2 cm 2 V –1 s –1 ) is formed by stacking. The composite hole transport material (HTM) is prepared by blending T5DP-2,7 with the cross-linked 4,4′- bis(3-vinyl-9H-carbazol-9-yl)-1,1′biphenyl (CBP-V) which shows the deep highest occupied molecular orbital energy level. The increased hole mobility of the target composite HTM from 10 –4 to 10 –3 cm 2 V –1 s –1 as well as the stepwise energy levels facilitates the hole transport, which would be beneficial for more balanced carrier injection. This composite hole transport layer (HTL) has improved the deep-blue-emission performances of Commission International de I'Eclairage of (0.14, 0.04), luminance of 44080 cd m −2 , and external quantum efficiency of 18.59%. Furthermore, when L 0 is 100 cd m −2 , the device lifetime T 50 is extended from 139 to 502 h. The state-of-the-art performance shows the successful promotion of the high-efficiency for deep blue QLEDs, and indicates that the optimizing HTL by discotic molecule stacking can serve as an excellent alternative for the development of HTL in the future.
研究领域:
材料科学
·
光电技术
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DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Ziqi Nie,Lu Huang,Cewei Ren,Xinlin Xiong,Wenqing Zhu,Weiguang Yang,Linjun Wang
The facile approach combined the halide mixture of chloride and bromide anions with the exchange of short-chain ligand Phenethylamine (PEA) was used to prepare hybrid perovskite PEA-MAPbBr 3-x Cl x quantum dots (PEA-QDs-Cl), which realized blue emissive quantum dots light-emitting diode (QLED) with wider gamut of Commission Internationale de l’Eclairage (CIE) coordinates (Δx = −0.04, Δy = 0.03) than National Television Systems Committee (NTSC) TV color standard. Compared to pristine MAPbBr 3 quantum dots (pristine-QDs) prepared by conventional long-chain ligands, the size of PEA-QDs-Cl was manipulated from 9 nm to 3 nm characterized by HRTEM, emissive spectra were blue shifted from 528 nm to 469 nm measured by photoluminescence (PL). Meanwhile, time-resolved PL (TRPL) decay lifetimes of perovskite quantum dots doped with chloride anions (QDs-Cl) were improved from 10.3 ns to 13.9 ns, because short-chain ligands were introduced to passivate defects on the surface of QDs-Cl. Furthermore, XPS results showed that the chloride content was decreased from 34.7% to 33.7% through chloride vacancies on the surface of QDs-Cl were passivated by PEA.
研究领域:
材料科学
·
光学工程
·
纳米技术
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产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Min Yang,Qin Zhang,Wenjing Zhang,Zhongqi Hao,Yuancheng Qin,Xia Hai,Fangfang Li,Dan Zhou,Yubao Zhang
Improving the hole carrier mobility of organic hole-transporting materials is critical for the development of advanced quantum dot light-emitting diodes (QLEDs). Here, a simple method is reported for enhancing the hole-charge mobility in poly(9-vinylcarbazole), PVK. Doping of the PVK using the molecular Lewis acid tris(pentafluorophenyl)borane as a dopant is shown to have a powerful effect on the hole-charge mobility, and the performance of the QLEDs. By adjusting the amount of dopant, the p-type Hall mobility can be increased up to 3.3-fold, and thereby, the external quantum efficiency and current efficiency of QLEDs are improved by 132% and 249%, respectively.
研究领域:
材料科学
·
电气工程
·
光电技术
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DOI
高影响因子
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