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学者姓名：陈恩果
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Abstract ：
Inorganic metal halide perovskite quantum dots (PQDs) have recently emerged as promising candidates for color conversion materials in Micro-LED displays, due to their outstanding color purity, high absorption coefficient, tunable emission wavelength. However the inferior stability and undesirable photoluminescence quantum yield (PLQY) restrict their particle applications. Herein, CsPbX3/PMMA (X = Br, I) composites with improved stability and optical performance were successfully prepared by a general and mild in-situ polymerization strategy. The ester carbonyl (C--O) group in MMA formed complexes with Pb2+, leading to the in-situ thermal polymerization of polymethyl methacrylate (PMMA) under the action of the initiator. The multifunctional PMMA can efficiently passivate halogen vacancies while acting as a barrier against the degradation caused by heat, water, and oxygen. As a result, the PLQYs and stability of PMMA-coated CsPbX3 PQDs have been significantly improved. When implementing CsPbX3/PMMA/PDMS composites as color conversion layers in Micro-LEDs, they achieve an impressive color gamut of 127.23% with excellent stability. We believe our work will stimulate the exploration of perovskite/polymer composites for industrial Micro-LED applications.
Keyword ：
dots dots Inorganic metal halide perovskite quantum Inorganic metal halide perovskite quantum In-situ polymerization In-situ polymerization Micro-LED Micro-LED Photoluminescence Photoluminescence PMMA PMMA
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| GB/T 7714 | Cai, Junhu , Zhang, Xiang , Chen, Yu et al. Highly luminescent CsPbX3/PMMA (X=Br, I) composites with improved stability for full-color Micro-LED displays [J]. | JOURNAL OF LUMINESCENCE , 2024 , 269 . |
| MLA | Cai, Junhu et al. "Highly luminescent CsPbX3/PMMA (X=Br, I) composites with improved stability for full-color Micro-LED displays" . | JOURNAL OF LUMINESCENCE 269 (2024) . |
| APA | Cai, Junhu , Zhang, Xiang , Chen, Yu , Lai, Wenzong , Zhang, Wenyan , Lin, Zexi et al. Highly luminescent CsPbX3/PMMA (X=Br, I) composites with improved stability for full-color Micro-LED displays . | JOURNAL OF LUMINESCENCE , 2024 , 269 . |
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Over the past few years, light-emitting diodes (LEDs) have emerged as an efficient replacement for standard incandescent and fluorescent lamps, due to their superior efficiency, energy conservation, service longevity, reliability, and affordability. However, identifying a red emitter for white LEDs has presented significant challenges. This study seeks to synthesize and analyze a novel red emitter, investigating its potential use in white LEDs and indoor plant growth lighting. The Sr2Lu(Nb,Mn)O6 is manufactured employing the traditional high-temperature solid-phase method. The internal and external quantum efficiencies (IQE and EQE) of double perovskites reached 32.39% and 21.67%. The g value calculates to 2.146, which corroborates that the magnetic dipolar transitions of Mn4+ ions inhabit symmetric octahedral sites. First-principles investigations are utilized to unveil local electronic structures. Emission spectra reveal a substantial broad red emission peak at 688 nm. The Tanabe-Sugano diagram is applied to understand the luminescence mechanism. Additionally, the evaluation of parameters such as the internal UV emission ratio, crystal field strength, and Racah parameters is conducted. The luminescent intensity of the Sr2Lu(Nb,Mn)O6 can still be maintained at 60% upon reaching a temperature of 423 K. The findings suggest that Sr2Lu(Nb,Mn)O6 offers a novel alternative for white LEDs and indoor plant growth lighting. This paper unveils the local electronic structure of manganese-doped Sr2LuNbO6 double perovskite red emitter, and elaborates on its crystal structures, luminescence properties, crystal field properties, thermal stability, and energy transfer mechanisms. Based upon first principles calculations, reveals the superior photoelectric performance of it, positioning it as a potential solution for the red-deficiency in white LED and indoor lighting technologies. image
Keyword ：
double perovskite double perovskite first-principles first-principles solid-state lighting solid-state lighting thermometry thermometry white LEDs white LEDs
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| GB/T 7714 | Zheng, Xingke , Du, Aochen , Ye, Yun et al. Unveiling Local Electronic Structures of Manganese-Doped Double Perovskites Red Emitters [J]. | LASER & PHOTONICS REVIEWS , 2024 , 18 (5) . |
| MLA | Zheng, Xingke et al. "Unveiling Local Electronic Structures of Manganese-Doped Double Perovskites Red Emitters" . | LASER & PHOTONICS REVIEWS 18 . 5 (2024) . |
| APA | Zheng, Xingke , Du, Aochen , Ye, Yun , Chen, Enguo , Xu, Sheng , Guo, Tailiang . Unveiling Local Electronic Structures of Manganese-Doped Double Perovskites Red Emitters . | LASER & PHOTONICS REVIEWS , 2024 , 18 (5) . |
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Augmented reality (AR) near-eye displays seamlessly integrate virtual information with real world, in which the optical waveguide is the key component functioned as a coupler. Due to strong chromatic aberration, independent waveguides are always indispensable to separate the three primary colors that inevitably brings larger and thicker appearance. To address this, this paper proposes a new chromatic-aberration-free single-layer waveguide for AR displays by integrating a double-layer grating metasurface (MS) and the covered cylindrical MSs. The double-layer grating MS breaks through the limitations on a narrow wavelength band, enabling high diffraction efficiency for incident light deflection across the entire visible spectrum. Further, the cylindrical MSs provide accurate control over incident angles, not only overcoming the challenge of total reflection but also effectively eliminating chromatic aberration. Design results show that the proposed structure achieves an impressive diffraction efficiency of over 80 % for blue and green light and over 90 % for red light with an outstanding diffraction angular difference lower than 2.5 deg. Real-time ray tracing simulation demonstrates the capability of the designed AR engine to achieve high-resolution full-color imaging. The compound MSs enable precise light and color control for a single-layer waveguide coupler with exceptional diffraction efficiency and minimal chromatic aberration, which show great potential for cutting-edge AR applications.
Keyword ：
Augmented reality Augmented reality Chromatic-aberration-free Chromatic-aberration-free Compound metasurfaces Compound metasurfaces Full-color imaging Full-color imaging High diffraction efficiency High diffraction efficiency Near-eye displays Near-eye displays
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| GB/T 7714 | Sun, Zhilin , Yan, Shuzhan , Chen, Kangkang et al. Single-layer waveguide with compound metasurfaces for highly efficient and chromatic-aberration-free augmented reality near-eye displays [J]. | OPTICS AND LASERS IN ENGINEERING , 2024 , 178 . |
| MLA | Sun, Zhilin et al. "Single-layer waveguide with compound metasurfaces for highly efficient and chromatic-aberration-free augmented reality near-eye displays" . | OPTICS AND LASERS IN ENGINEERING 178 (2024) . |
| APA | Sun, Zhilin , Yan, Shuzhan , Chen, Kangkang , Lin, Zijian , Ye, Yun , Xu, Sheng et al. Single-layer waveguide with compound metasurfaces for highly efficient and chromatic-aberration-free augmented reality near-eye displays . | OPTICS AND LASERS IN ENGINEERING , 2024 , 178 . |
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Alloyed quantum dots (QDs) show great potential for photoluminescence (PL) applications. However, the oxidative decay of QDs during photoexcitation has been a major hurdle to the application of QDs. Blocking water-oxygen erosion by coating oxides on the surface of QDs is a common technique. Even though, this approach often leads to alterations in the optical properties of QDs and reduced compatibility with polymers. In this paper, hindered phenol was utilized to treat QDs to form QD/Hindered phenol complexes. Using the reduction of phenolic hydroxyl group in the hindered phenol, the hindered phenol was used as an exhausted substance to protect QDs from oxidation. After 450 h of aging, the obtained QD/Hindered phenol complex kept the photoluminescence quantum yield (PLQY) at 48 %. The luminance of the QD diffusion plate prepared by the QD/Hindered phenol complexes maintained above 98 % of the initial value after aging 1032 h. The introduction of phosphite ester further improved the photostability of QD/Hindered phenol complex under blue-light excitation. This technique promotes the application of QDs in polymers and offers a new reference for improving the stability of QDs under photoexcitation.
Keyword ：
Hindered phenol Hindered phenol Optical stability Optical stability Photo -oxidation Photo -oxidation QD diffusion plate QD diffusion plate Quantum dots Quantum dots
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| GB/T 7714 | Zeng, Zhenyu , Xie, Hongxing , Ye, Yun et al. Enhancement of photo-oxidation resistance of quantum dots by hindered phenol and its application in diffusion plate [J]. | OPTICAL MATERIALS , 2024 , 148 . |
| MLA | Zeng, Zhenyu et al. "Enhancement of photo-oxidation resistance of quantum dots by hindered phenol and its application in diffusion plate" . | OPTICAL MATERIALS 148 (2024) . |
| APA | Zeng, Zhenyu , Xie, Hongxing , Ye, Yun , Zheng, Xingke , Lin, Qizhong , Chen, Enguo et al. Enhancement of photo-oxidation resistance of quantum dots by hindered phenol and its application in diffusion plate . | OPTICAL MATERIALS , 2024 , 148 . |
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As metaverse continues to evolve, near-eye display technologies are increasingly focused on achieving compactness, lightweight, and high brightness design. Self-emitting projection sources have garnered significant attention due to their potential to meet these requirements. However, current projection sources typically exhibit a Lambertian-like divergence angle, leading to challenges in miniaturization and substantial energy loss. In response to these issues and inspired by the shape of "mushroom cap", this paper proposes a collimated light-emitting diode array encapsulated with mushroom-cap optical units for near-eye display projection engine. The study discusses the optimal parameters for the limited diode spacing and validates these parameters through both simulation and experimental results. The mushroom-cap optical units effectively harness the emitting energy, confining the full width at half maximum of Lambertian sources within the +/- 10 degrees range, while enhancing the central light intensity by 80%. The built experimental prototype demonstrates a significant enhancement in projection quality and visibility. This design holds promise for ultra-small self-emitting projection engines, offering robust support for the high performance and lightweight design of near-eye display devices.
Keyword ：
Brightness Brightness collimation collimation Engines Engines Lenses Lenses Light-emitting diode Light-emitting diode Light sources Light sources near-eye display near-eye display Optical imaging Optical imaging Optical reflection Optical reflection Organic light emitting diodes Organic light emitting diodes projection engine projection engine
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| GB/T 7714 | Chen, Enguo , Yao, Ziming , Fan, Zhengui et al. Collimated LED Array With Mushroom-Cap Encapsulation for Near-Eye Display Projection Engine [J]. | IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS , 2024 , 30 (2) . |
| MLA | Chen, Enguo et al. "Collimated LED Array With Mushroom-Cap Encapsulation for Near-Eye Display Projection Engine" . | IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 30 . 2 (2024) . |
| APA | Chen, Enguo , Yao, Ziming , Fan, Zhengui , Lai, Wenzong , Liang, Tao , Yan, Qun et al. Collimated LED Array With Mushroom-Cap Encapsulation for Near-Eye Display Projection Engine . | IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS , 2024 , 30 (2) . |
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Metal halide perovskites (MHPs) have demonstrated remarkable performance with efficient luminescence and color tunability, which potentially replace traditional luminescent materials in up-to-date display technology. However, MHPs still face serious challenges in stability and efficiency for display applications. The ligand strategy is currently one of the most effective approaches for comprehensive performance improvement in perovskite displays (Pe-displays). This paper reviews the recent progress of the comprehensive performance improvement of Pe-displays from the perspective of the ligand strategy in recent years, which has never been emphasized before. First, defect types are summarized to boost the further understanding of MHPs. The detailed ligand strategies for different site defects are then reviewed for the purpose of further work. Finally, the outlooks of the ligand strategy are raised to promote further study and commercialization of next-generation Pe-displays. This review comprehensively focuses on the study of perovskite ligand strategies that can be widely extended to the applications of emerging displays.
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| GB/T 7714 | Zhang, Xiang , Cai, Junhu , Yang, Longwen et al. Ligand Strategy for Perovskite Displays: A Review [J]. | ACS ENERGY LETTERS , 2024 , 9 (4) : 1587-1603 . |
| MLA | Zhang, Xiang et al. "Ligand Strategy for Perovskite Displays: A Review" . | ACS ENERGY LETTERS 9 . 4 (2024) : 1587-1603 . |
| APA | Zhang, Xiang , Cai, Junhu , Yang, Longwen , Luo, Jiajun , Guo, Tailiang , Chen, Enguo . Ligand Strategy for Perovskite Displays: A Review . | ACS ENERGY LETTERS , 2024 , 9 (4) , 1587-1603 . |
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All-inorganic perovskite quantum dots (PQDs) have excellent photoelectric performance, such as high photoluminescence quantum yield (PLQY), narrow full width at half-maximum (FWHM), and emission spectra covering the visible light wavelength. The emission color can be tuned over the full visible spectral region making them promising for white-light-emitting diodes (WLEDs). Further control over the optical and magnetic properties of PQDs can be achieved through doping of transition metal ions such as Mn2+ ions. In this paper, a rapid doping method is employed at room temperature by using strong-acid cation-exchange resin during the metal ions doping process, which shortens the doping time, and Mn:CsPb(Cl/Br)3 QDs were obtained. By controlling the reaction time between strong-acid cation-exchange resin and PQDs, we achieve different levels of manganese doping, resulting in a new, to the best of our knowledge, fluorescence peak at 600 nm. The introduction of strong-acid cation-exchange resin preserves the integrity of the PQD structure, while completing the doping within 30 min. Due to the low cost and mild reaction conditions of resin, it is expected that the Mn:CsPb(Cl/Br)3 QDs can be mass-produced in large quantities. In addition, in order to provide high-quality white light emission, and prevent anion exchange reactions when mixed with CsPbBr3 QDs, the CsPbBr3 QDs are coated with silicon. Finally, by combining ultraviolet-lightemitting diodes (UVLEDs) with the aforementioned PQD mixture, this paper successfully fabricates WLEDs and demonstrates its excellent photoelectric performance. The constructed WLEDs produce warm white light with a high color rendering index (CRI) of 91 and a high correlated color temperature (CCT) of 5966 K, and the luminous efficacy (LE) of WLEDs is 41 lmW-1. (c) 2024 Optica Publishing Group
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| GB/T 7714 | Yang, Longwen , Du, Aochen , Zheng, Xingke et al. Rapid room temperature synthesis of Mn-doped perovskite quantum dots for white-light-emitting diodes [J]. | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (3) : 809-819 . |
| MLA | Yang, Longwen et al. "Rapid room temperature synthesis of Mn-doped perovskite quantum dots for white-light-emitting diodes" . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 41 . 3 (2024) : 809-819 . |
| APA | Yang, Longwen , Du, Aochen , Zheng, Xingke , Ye, Yun , Chen, Enguo , Xu, Sheng et al. Rapid room temperature synthesis of Mn-doped perovskite quantum dots for white-light-emitting diodes . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (3) , 809-819 . |
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量子点(Quantum dots)由于具有优异的光电特性,广泛应用于发光与显示、太阳能电池、光催化等领域,它的发现和合成获得了2023年诺贝尔化学奖.采用量子点色转换的Micro-LED全彩化显示技术无需巨量转移,有望实现大规模量产,然而,量子点在高强度Micro-LED出光激发下的性能和寿命仍存在局限.基于此,本文研究了基于量子点@有序介孔(QDs@SBA-15)复合材料的Micro-LED色转换技术及其特性,有序介孔分子筛载体独特的孔道结构不仅能够有效提升Micro-LED色转换和光提取效率,且致密的有序介孔材料也一定程度上保障了量子点的稳定性.首先,通过时域有限差分方法(FDTD)建立了Micro-LED仿真模型,探究量子点粒径和有序介孔材料的孔径对光提取效率的影响;基于仿真结果指导,进一步采用物理共混法制备了QDs@SBA-15复合材料,通过透射光谱、荧光激发光谱、紫外-可见光吸收谱等手段对其进行表征并确定浓度配比;最后,将该复合材料与聚二甲基硅氧烷(PDMS)混合固化成膜,并研究了其光致发光性能.实验结果发现,量子点粒径和介孔材料孔径的匹配度以及量子点和有序介孔材料的比例浓度是影响QDs@SBA-15复合材料发光效率及Micro-LED色转换性能的关键因素;通过优化,所得复合材料可获得优异的发光性能以及良好的环境稳定性,相比于纯量子点色转换层,复合材料的光提取效率提升了81.73％,复合材料的环境稳定性提升了14.33％,以Micro-LED作为蓝光光源组成的三基色发光器件工作色域达到了104.52％NTSC.本研究为量子点色转换Micro-LED显示技术提供了理论指导,为实现Micro-LED全彩化开辟了新路径.
Keyword ：
Micro-LED Micro-LED 有序介孔材料 有序介孔材料 色转换 色转换 量子点 量子点
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| GB/T 7714 | 陈晓钢 , 赵梦云 , 蔡俊虎 et al. 基于量子点@有序介孔复合材料的Micro-LED色转换特性 [J]. | 发光学报 , 2024 , 45 (1) : 59-68 . |
| MLA | 陈晓钢 et al. "基于量子点@有序介孔复合材料的Micro-LED色转换特性" . | 发光学报 45 . 1 (2024) : 59-68 . |
| APA | 陈晓钢 , 赵梦云 , 蔡俊虎 , 李恭明 , 查楠 , 叶芸 et al. 基于量子点@有序介孔复合材料的Micro-LED色转换特性 . | 发光学报 , 2024 , 45 (1) , 59-68 . |
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Edge detection is an important research field in image processing and computer vision, especially in feature extraction. The detection efficiency of the traditional Sobel edge detection algorithm is reduced due to serial instructions, and its recognition ability for complex image textures is weak. The threshold needs to be set artificially. In this context, we present an improved Sobel algorithm, which enlarges the traditional operator convolution factor size to 5×5, extends the direction to 16 directions, and introduces the median as a local adaptive threshold for judgment. The improved algorithm is implemented using FPGA and MATLAB respectively, and processes image data with a resolution of 1280×720. The experimental results show that: When the clock frequency of the image processing module is 84 MHz, the FPGA processes a 1280×720 image in about 0.0109 s, while the MATLAB processes the same image in an average time of 0.915 s. The Sobel edge detection algorithm proposed in this work effectively denoises the image while also detecting the edge information of the image efficiently and accurately. The algorithm processing speed is improved by about 84 times, which can well meet the real-time requirements of video image processing systems. © 2024 John Wiley and Sons Inc. All rights reserved.
Keyword ：
Adaptive threshold Adaptive threshold Edge detection Edge detection FPGA FPGA Image processing Image processing Median filtering Median filtering
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| GB/T 7714 | Yuan, L. , Hu, Y. , Hu, L. et al. Design of Hardware Accelerator for Real-Time Edge Detection System Based on FPGA [未知]. |
| MLA | Yuan, L. et al. "Design of Hardware Accelerator for Real-Time Edge Detection System Based on FPGA" [未知]. |
| APA | Yuan, L. , Hu, Y. , Hu, L. , Chen, E. , Xu, S. , Guo, T. et al. Design of Hardware Accelerator for Real-Time Edge Detection System Based on FPGA [未知]. |
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Existing image inpainting networks may cause distorted image structures and blurred textures during restoration. Therefore, we propose an image inpainting algorithm based on Multi-Scale Feature Fusion Generative Adversarial Network (MSFF). First, we use a Context Fusion Transformer Block (CFTB) to enlarge the receptive field of the defective image and reduce the feature loss caused by sampling. Second, we design an Aperture Attention Block (ATAB) to capture the shallow feature information and perform fine-grained feature fusion. Finally, through the decoder, we generate high-quality inpainted images step by step from coarse to fine. The results of multiple experiments show that our method has a better inpainting effect. © 2024 John Wiley and Sons Inc. All rights reserved.
Keyword ：
Critical information attention mechanism Critical information attention mechanism Generative Adversarial Network Generative Adversarial Network Image inpainting Image inpainting Multi-Scale Multi-Scale
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| GB/T 7714 | Hu, L. , Yuan, L. , Hu, Y. et al. Multi-Scale Feature Fusion Generative Adversarial Network for Image Inpainting [未知]. |
| MLA | Hu, L. et al. "Multi-Scale Feature Fusion Generative Adversarial Network for Image Inpainting" [未知]. |
| APA | Hu, L. , Yuan, L. , Hu, Y. , Chen, E. , Xu, S. , Guo, T. et al. Multi-Scale Feature Fusion Generative Adversarial Network for Image Inpainting [未知]. |
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