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学者姓名：曾群英
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Abstract ：
Zinc oxidenanoparticles (ZnO NPs) is widely used as electron transport layer material in quantum dot light-emitting diodes (QLED) due to its high carrier mobility, unique photoelectric properties and good stability. However, because ZnO has higher electron mobility than organic hole transport materials, the carrier transport is unbalanced. In addition, ZnO NPs has many surface defects, which is easy to capture electrons or holes, increasing the probability of non-radiative recombination. To solve these problems, we carefully selected an organic compound diallylamine (DAA) doping method to modify the surface of ZnO. DAA is found to not only reduce the quenching at the interface between ZnO and QD, but also regulate the energy level position to promote the carrier injection balance of QLED devices. Compared with control ZnO QLED, the external quantum efficiency (EQE) of the red QLED with DAA-modified ZnO NPs is significantly improved, the peakEQE of the devices increased by 21% from 18.8% to 23.6%. respectively. It is a simple and economical solution for manufacturing high-performance QLED.
Keyword ：
diallylamine diallylamine Quantum dot light-emitting diodes Quantum dot light-emitting diodes ZnO ZnO
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| GB/T 7714 | Chen, Haomin , Zeng, Qunying , Zhu, Yangbin et al. Efficient Quantum Dot Light-Emitting Diodes With DAA Doped Electron Transport Layer [J]. | IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY , 2024 , 12 : 306-309 . |
| MLA | Chen, Haomin et al. "Efficient Quantum Dot Light-Emitting Diodes With DAA Doped Electron Transport Layer" . | IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY 12 (2024) : 306-309 . |
| APA | Chen, Haomin , Zeng, Qunying , Zhu, Yangbin , Wu, Tuo , Fan, Yijie , Guo, Tailiang et al. Efficient Quantum Dot Light-Emitting Diodes With DAA Doped Electron Transport Layer . | IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY , 2024 , 12 , 306-309 . |
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Light-emitting electrochemical cells (LECs) are one of the most promising technologies for solid-sate lighting and display. We present a hybrid device concept for achieving higher performance by combining red colloidal quantum dots (QDs) and Ir-based ionic transition metal complex (iTMC). The utilized QDs exhibit a core-shell structure of CdSe/ZnS. By this method, the resultant devices exhibit a maximum luminance of 14 383 cd/m(2) and current efficiency (CE) of 2.00 cd/A, almost fourfold higher than those (3475 cd/m(2) and 0.55 cd/A) of the control device. In conclusion, QDs exert a regulatory effect on charge carrier transport in hybrid devices, gradually aligning the electron and hole injection of the device, thus enhancing its performance. Red QD (RQD) not only has an electron injection buffering effect but also plays a certain role in hole blocking.
Keyword ：
Brightness Brightness Capacitance Capacitance Cathodes Cathodes Charge carrier processes Charge carrier processes Electron injection buffering Electron injection buffering Electrons Electrons hole blocking hole blocking light-emitting electrochemical cells (LECs) light-emitting electrochemical cells (LECs) Performance evaluation Performance evaluation red quantum dots (RQDs) red quantum dots (RQDs) Standards Standards
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| GB/T 7714 | Wu, Tuo , Zeng, Qunying , Zhu, Yangbin et al. Enhancing the Performance of Light-Emitting Electrochemical Cells by Incorporating Quantum Dots [J]. | IEEE TRANSACTIONS ON ELECTRON DEVICES , 2024 , 71 (6) : 3998-4001 . |
| MLA | Wu, Tuo et al. "Enhancing the Performance of Light-Emitting Electrochemical Cells by Incorporating Quantum Dots" . | IEEE TRANSACTIONS ON ELECTRON DEVICES 71 . 6 (2024) : 3998-4001 . |
| APA | Wu, Tuo , Zeng, Qunying , Zhu, Yangbin , Chen, Haomin , Shan, Guogang , Guo, Tailiang et al. Enhancing the Performance of Light-Emitting Electrochemical Cells by Incorporating Quantum Dots . | IEEE TRANSACTIONS ON ELECTRON DEVICES , 2024 , 71 (6) , 3998-4001 . |
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Light-emitting electrochemical cells (LECs) as simple and low-cost electroluminescent devices are one of the most promising candidates for the next-generation flexible and large-area solid-state lighting applications. However, the development of efficient emissive materials to achieve both excellent efficiency and stability, especially for flexible LECs, remains a challenge. Herein, we demonstrate a remarkable enhancement of overall device performance using a facile and feasible di-nuclearization strategy. The symmetrical dinuclear iridium(iii) complex (D-Ir2) and its mononuclear counterpart (M-Ir1) are designed and synthesized. Although it has little effect on the emission color, the adopted approach ingeniously manipulates the intrinsic photophysical processes and solid-packing, leading to distinct LEC performance. Flexible LECs employing D-Ir2 as an emitting layer realizes a current efficiency of 14.2 cd A(-1) and external quantum efficiency of 5.1%, almost twice as high as that of M-Ir1. Encouragingly, compared with a short half-lifetime (t(1/2)) of 190 min for M-Ir1, the D-Ir2-based LEC demonstrates better stability in the open air with t(1/2) of 312 min. The large decomposition energy of ligands and facile intersystem crossing supported by theoretical calculations account for its superiority. This study will provide a new perspective for constructing phosphorescent materials suitable for high-performance flexible optoelectronics.
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| GB/T 7714 | Song, Weilin , Mao, Huiting , Shao, Kuizhan et al. Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 11 (3) : 1197-1204 . |
| MLA | Song, Weilin et al. "Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells" . | JOURNAL OF MATERIALS CHEMISTRY C 11 . 3 (2022) : 1197-1204 . |
| APA | Song, Weilin , Mao, Huiting , Shao, Kuizhan , Shan, Guogang , Gao, Ying , Zeng, Qunying et al. Dinuclearization strategy of cationic iridium(iii) complexes for efficient and stable flexible light-emitting electrochemical cells . | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 11 (3) , 1197-1204 . |
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Light-emitting electrochemical cells (LECs) have the advantages of simple structure, low driving voltage, and low packaging requirements. However, due to the different mobility of electrons and holes in emission layer, exciton quenching is inevitable caused by carrier imbalance. In this work, a red light cationic Ir(III) complexes [Ir (tBuPBI)2(qibi)]PF6 (R) was used as the luminescent materials for the LECs, and we use the doping of MoOx into poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) layer to lower the energy barrier between complexes R and anode. In combination with the introduction of Al/LiF composite cathode, the carrier injection efficiency of the LECs is significantly improved, leading to the enhanced balance of carrier injection. In particular, high electron injection efficiency would significantly contribute to the device improvement based on the complexes with hole-preferred transporting characteristic. With enhanced carrier injection, the recombination region of the carrier is located near the center of emission layer, and the exciton quenching near the electrode will be significantly alleviated. The maximum external quantum efficiency of the LEC device is as high as 11.77%, which is 1.3 time that of the standard device. The half-lifetime of the device is 690 min, which is about 1.37 times of that of the standard device.
Keyword ：
Carrier balance Carrier balance Cationic Ir(III) complexes Cationic Ir(III) complexes Injection efficiency Injection efficiency Light-emitting electrochemical cells Light-emitting electrochemical cells Recombination region Recombination region
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| GB/T 7714 | Chen, Zhixin , Zeng, Qunying , Yang, Kaiyu et al. Enhancing carrier injection efficiency of light-emitting electrochemical cells based on Cationic Ir(III) complexes by interface modification [J]. | OPTICAL MATERIALS , 2021 , 117 . |
| MLA | Chen, Zhixin et al. "Enhancing carrier injection efficiency of light-emitting electrochemical cells based on Cationic Ir(III) complexes by interface modification" . | OPTICAL MATERIALS 117 (2021) . |
| APA | Chen, Zhixin , Zeng, Qunying , Yang, Kaiyu , Su, Zhongmin , Shan, Guogang , Li, Fushan . Enhancing carrier injection efficiency of light-emitting electrochemical cells based on Cationic Ir(III) complexes by interface modification . | OPTICAL MATERIALS , 2021 , 117 . |
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Here, we propose a facile strategy to realize all-solution-processed highly efficient full-color-enabling white emitting quantum dot light-emitting diodes (QLEDs) at ambient conditions by using low-cost blade coating technique, which was also compatible with the roll to roll fabrication process for large size production. Firstly, by using red quantum dots (QDs) as the representative to optimize the QDs films by blade coating, the QDs films exhibit excellent morphology and well-ordered self-assembly structure. Then, the trichromatic white QLEDs based on mixed red, green and blue quantum dots were obtained with Commission Internationale De I'Eclairage (CIE) coordinates ranging from (0.42, 0.41) to (0.31, 0.33) within the white region of CIE 1931 when driving voltage vary from 5 v to 8 v. The device enjoys excellent optoelectronic performance including a maximum luminance of 11,465 cd/m(2), a maximum current efficiency (eta(A)) of 9.2 cd/A and an external quantum efficiency (EQE) of 3.7%. In addition, 3 x 8 cm2 white QLEDs with bright and homogenous light emission fabricated by blade coating are demonstrated. Our strategy for fabricating large-area white QLEDs indicate promising applications in the low-cost solid-state lighting and flat-panel displays.
Keyword ：
Blade coating Blade coating Large-size Large-size Quantum dots Quantum dots White light emitting diodes White light emitting diodes
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| GB/T 7714 | Zeng, Qunying , Chen, Zhixin , Liu, Yang et al. Efficient larger size white quantum dots light emitting diodes using blade coating at ambient conditions [J]. | ORGANIC ELECTRONICS , 2021 , 88 . |
| MLA | Zeng, Qunying et al. "Efficient larger size white quantum dots light emitting diodes using blade coating at ambient conditions" . | ORGANIC ELECTRONICS 88 (2021) . |
| APA | Zeng, Qunying , Chen, Zhixin , Liu, Yang , Guo, Tailiang . Efficient larger size white quantum dots light emitting diodes using blade coating at ambient conditions . | ORGANIC ELECTRONICS , 2021 , 88 . |
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Abstract ：
Highly efficient light-emitting electrochemical cells (LECs) have attracted tremendous interest because of their simple structures and low-cost fabrication processing, showing great potential for full-color displays and solid-state lighting. In this work, we rationally designed and synthesized two red-emitting cationic Ir(III) complexes, [Ir(tBuPBI)(2)(biq)]PF6 (R1) and [Ir(tBuPBI)(2)(qibi)PF6(R2), in which a tert-butyl-functionalized 1,2-diphenyl-1H-benzo[d]imidazole (PBI) unit and conjugated 2,2'-biquinoline (biq) and 2-(1-phenyl-1H-benzo[d]imidazol-2-yl)quinolone (qibi) were employed as cyclometalated and ancillary ligands, respectively. The introduced tert-butyl group led to homogeneous and highly emissive thin films by increasing the solubility and suppressing the strong intermolecular interactions due to steric hindrance. Based on the abovementioned high-quality emissive layer, high-efficiency LECs were achieved. An efficient red-emitting LEC fabricated on a glass substrate achieved a current efficiency (eta(C)) of 7.18 cd/A and an external quantum efficiency (eta(ext)) of 9.32%. By doping both complexes into a blue-green-emitting cationic Ir(III) complex, high-performance white LECs were also successfully fabricated with Commission International de L'Eclairage (CIE) 'coordinates of (0.39,0.39), a eta(C) of 17.43 cd/A, and a eta(ext) of 8.92%. In addition, we also fabricated flexible red and white LECs with outstanding efficiencies and mechanical flexibilities. The eta(C) and eta(ext) values of a flexible white LEC could be as high as 13.50 cd/A and 6.86%, respectively. The efficiency of the flexible device remained at approximately 95% of the initial value after 500 bends with a radius of curvature of 5 mm, demonstrating the great potential of these complexes for full-color displays and flexible optoelectronics.
Keyword ：
flexible flexible Ir(III) complexes Ir(III) complexes light-emitting electrochemical cells light-emitting electrochemical cells red-emitter red-emitter white-emitting white-emitting
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| GB/T 7714 | Zeng, Qunying , Li, Fushan , Chen, Zhixin et al. Rational Design of Efficient Organometallic Ir(III) Complexes for High-Performance, Flexible, Monochromatic, and White Light-Emitting Electrochemical Cells [J]. | ACS APPLIED MATERIALS & INTERFACES , 2020 , 12 (4) : 4649-4658 . |
| MLA | Zeng, Qunying et al. "Rational Design of Efficient Organometallic Ir(III) Complexes for High-Performance, Flexible, Monochromatic, and White Light-Emitting Electrochemical Cells" . | ACS APPLIED MATERIALS & INTERFACES 12 . 4 (2020) : 4649-4658 . |
| APA | Zeng, Qunying , Li, Fushan , Chen, Zhixin , Yang, Kaiyu , Liu, Yang , Guo, Tailiang et al. Rational Design of Efficient Organometallic Ir(III) Complexes for High-Performance, Flexible, Monochromatic, and White Light-Emitting Electrochemical Cells . | ACS APPLIED MATERIALS & INTERFACES , 2020 , 12 (4) , 4649-4658 . |
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Dinuclear Ir(III) complexes have recently emerged with great promise for organic electroluminescent devices owing to their unique merits such as increased spin-orbit coupling and adjustable photophysical properties. However, most of them require sophisticated doping processes for their engineering, resulting in high production costs. Herein, we developed novel dinuclear Ir(III) complexes, which become weak phosphors in solution but exhibit intensified emission in the solid state. The intermolecular interaction-caused quenching was suppressed perfectly, and the carrier transport abilities were modulated simultaneously, leading to high emission efficiencies in the neat film and balanced charge carrier transport. The green-emitting single-layer nondoped device achieved promising efficiencies with an external quantum efficiency (EQE) of 11.6% and current efficiency (CE) of 40.0 cd A(-1). The orange-emitting device realized an EQE of 12.9% and CE of 38.4 cd A(-1), which are the highest efficiencies reported to date for solution-processed single-layer nondoped devices and even comparable to that of most reported multilayer doping devices.
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| GB/T 7714 | Mao, Hui-Ting , Cui, Yang , Li, Guang-Fu et al. Dinuclear Ir(III) complexes with asymmetrical bridging ligands as highly efficient phosphors for single-layer electroluminescent devices [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2019 , 7 (43) : 13461-13467 . |
| MLA | Mao, Hui-Ting et al. "Dinuclear Ir(III) complexes with asymmetrical bridging ligands as highly efficient phosphors for single-layer electroluminescent devices" . | JOURNAL OF MATERIALS CHEMISTRY C 7 . 43 (2019) : 13461-13467 . |
| APA | Mao, Hui-Ting , Cui, Yang , Li, Guang-Fu , Shan, Guo-Gang , Zeng, Qun-Ying , Li, Fu-Shan et al. Dinuclear Ir(III) complexes with asymmetrical bridging ligands as highly efficient phosphors for single-layer electroluminescent devices . | JOURNAL OF MATERIALS CHEMISTRY C , 2019 , 7 (43) , 13461-13467 . |
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Inkjet printing technology is one of the most attractive methods for the realization of full-color patterning for displays. In this work, we successfully introduce this technology into fabricating pixelated light-emitting electrochemical cells (LECs). By carefully controlling the poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate), and cationic Ir(III) complexes ink formulation, as well as their inkjet printing properties, patterned LEC pixels in ultrahigh definition TV format was fabricated, leading to a resolution of 73 pixels per inch. The as-resulted inkjet-printed LEC exhibits a maximum luminance and a current efficiency of 3402 cd/m(2), and 7.5 cd/A, respectively, which is close to that of the spin-coated one. This work paves a new way for the fabrication of low-cost material-efficient, pixelated light-emitting electrochemical cells.
Keyword ：
Cationic Ir(III) complexes Cationic Ir(III) complexes Inkjet printing Inkjet printing Light-emitting electrochemical cells Light-emitting electrochemical cells
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| GB/T 7714 | Chen, Zhixin , Li, Fushan , Zeng, Qunying et al. Inkjet-printed pixelated light-emitting electrochemical cells based on cationic Ir(III) complexes [J]. | ORGANIC ELECTRONICS , 2019 , 69 : 336-342 . |
| MLA | Chen, Zhixin et al. "Inkjet-printed pixelated light-emitting electrochemical cells based on cationic Ir(III) complexes" . | ORGANIC ELECTRONICS 69 (2019) : 336-342 . |
| APA | Chen, Zhixin , Li, Fushan , Zeng, Qunying , Yang, Kaiyu , Liu, Yang , Su, Zhongmin et al. Inkjet-printed pixelated light-emitting electrochemical cells based on cationic Ir(III) complexes . | ORGANIC ELECTRONICS , 2019 , 69 , 336-342 . |
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In this paper, the aqueous solution-processed molybdenum oxide (sMoO(x) ) as an efficient hole injection layer for flexible quantum dot light emitting diodes (QLEDs) was prepared using a simple, low-cost and non-toxic solution method. Compared to the traditional device used poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as hole injection layer, the flexible QLED with modified sMoO(x) film has a higher maximum current efficiency, 5.46 cd/A. In addition, the stability and lifetime of flexible devices are improved effectively with the use of inorganic molybdenum oxide as hole injection layer, and they presented excellent flexibility through the repeated mechanical bending test at 5 mm radius of curvature.
Keyword ：
Flexible Flexible Light-emitting diodes Light-emitting diodes Molybdenum oxide Molybdenum oxide Quantum dots Quantum dots
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| GB/T 7714 | Zheng, Congxiu , Li, Fushan , Zeng, Qunying et al. Aqueous solution-processed molybdenum oxide as an efficient hole injection layer for flexible quantum dot light emitting diodes [J]. | THIN SOLID FILMS , 2019 , 669 : 387-391 . |
| MLA | Zheng, Congxiu et al. "Aqueous solution-processed molybdenum oxide as an efficient hole injection layer for flexible quantum dot light emitting diodes" . | THIN SOLID FILMS 669 (2019) : 387-391 . |
| APA | Zheng, Congxiu , Li, Fushan , Zeng, Qunying , Hu, Hailong , Guo, Tailiang . Aqueous solution-processed molybdenum oxide as an efficient hole injection layer for flexible quantum dot light emitting diodes . | THIN SOLID FILMS , 2019 , 669 , 387-391 . |
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Perovskite quantum dots (PeQDs) have emerged as a new kind of nanomaterial in various applications, especially light-emitting diodes (LEDs). However, the synthesis of PeQDs is relatively complicated and the electron transport layer (ETL) is usually fabricated in a vacuum because of the dissolution of PeQDs films in organic solvents, which will increase the difficulty and cost in mass production. Here, a simple one-step "ultrasonic bath" treatment to synthesis PeQDs is adopted and applied into the PeQDs-LEDs. Meanwhile, an all-solution process is developed to fabricate PeQDs-LEDs based on the solvent engineering strategy. By using methyl acetate (MeOAc) as the solvent of ETL, the all-solution-processed PeQDs-LEDs exhibit bright luminance with the maximum current efficiency of 3.26 cd/A. This work is simple and easy to be scaled up, which will pave a new way to the low-cost all-solution processable PeQDs-LEDs.
Keyword ：
all solution process all solution process light emitting diodes light emitting diodes perovskite quantum dots perovskite quantum dots solvent engineering solvent engineering ultrasonic ultrasonic
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| GB/T 7714 | Yang, Kaiyu , Li, Fushan , Liu, Yang et al. All-Solution-Processed Perovskite Quantum Dots Light-Emitting Diodes Based on the Solvent Engineering Strategy [J]. | ACS APPLIED MATERIALS & INTERFACES , 2018 , 10 (32) : 27374-27380 . |
| MLA | Yang, Kaiyu et al. "All-Solution-Processed Perovskite Quantum Dots Light-Emitting Diodes Based on the Solvent Engineering Strategy" . | ACS APPLIED MATERIALS & INTERFACES 10 . 32 (2018) : 27374-27380 . |
| APA | Yang, Kaiyu , Li, Fushan , Liu, Yang , Xu, Zhongwei , Li, Qanqian , Sun, Kai et al. All-Solution-Processed Perovskite Quantum Dots Light-Emitting Diodes Based on the Solvent Engineering Strategy . | ACS APPLIED MATERIALS & INTERFACES , 2018 , 10 (32) , 27374-27380 . |
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