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Unlocking high-performance near-infrared photodetection:polaron-assisted organic integer charge transfer hybrids

Light(Science & Applications) 2024年第12期13卷 3285-3296页

作者： Muhammad Ahsan Iqbal Xueqian Fang Yasir Abbas Xiaoliang Weng Tingchao He Yu-Jia Zeng School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China Guangdong Provincial Key Laboratory of Intelligent Disaster Prevention and Emergency Technologies for Urban Lifeline Engineering Dongguan University of TechnologyDongguan 523808China Department of Mechanics Tianjin UniversityTianjin 300350China Shenzhen Key Laboratory of Laser Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

Room temperature femtowatt sensitivity remains a sought-after attribute,even among commercial inorganic infrared(IR)photodetectors(PDs).While organic IR PDs are poised to emerge as a pivotal sensor technology in the forthcoming Fourth-Generation Industrial Era,their performance lags behind that of their inorganic *** discrepancy primarily stems from poor external quantum efficiencies(EQE),driven by inadequate exciton dissociation(high exciton binding energy)within organic IR materials,exacerbated by pronounced non-radiative recombination at narrow ***,we unveil a high-performance organic Near-IR(NIR)PD via integer charge transfer between Poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene](C-14PBTTT)donor(D)and Tetrafluorotetracyanoquinodimethane(TCNQF4)acceptor(A)molecules,showcasing strong low-energy subgap absorptions up to 2.5μ*** observe that specifically,polaron excitation in these radical and neutral D-A blended molecules enables bound charges to exceed the Coulombic attraction to their counterions,leading to an elevated EQE(polaron absorption region)compared to Frenkel *** a result,our devices achieve a high EQE of∼10^(7)%,femtowatt sensitivity(NEP)of~0.12 fW Hz^(-1/2)along a response time of~81ms,at room temperature for a wavelength of 1.0μ*** innovative utilization of polarons highlights their potential as alternatives to Frenkel excitons in high-performance organic IR PDs.

关键词： integer polaron charge

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Tailoring second harmonic generation in a multilayer WS2 flake via a silicon circular Bragg grating

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Optics Express 2025年第1期33卷 1556-1568页

作者： Cai, Lin Mao, Yuheng Zhou, Lidan Luo, Jinshan Liu, Shimei Li, Shulei Deng, Fu Lan, Sheng Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Optoelectronic Science and Engineering South China Normal University Guangzhou510006 China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-Sen University Guangzhou51006 China School of Optoelectronic Engineering Guangdong Polytechnic Normal University Guangzhou510665 China

Nonlinear emission phenomena observed in transition metal dichalcogenides (TMDCs) have significantly advanced the development of robust nonlinear optical sources within two-dimensional materials. However, the intrinsic emission characteristics of TMDCs are inherently dependent on the specific material, which constrains their tunability for practical applications. In this study, we propose a strategy for the selective enhancement and modification of second-harmonic generation (SHG) emission in a multilayer WS2 flake through the implementation of a silicon (Si)-based circular Bragg grating (CBG) structure positioned on an Au/SiO2 substrate. By selectively exciting the region of the circular Bragg grating with the grating oriented either parallel or perpendicular to the linearly polarized pump beam, we successfully achieved wavelength-tunable SHG intensity peaks at 402.5 nm and 425 nm for the respective alignments. Our experimental findings, corroborated by numerical simulations, indicate that the enhancement of SHG intensity is highly sensitive to the orientation of the grating region of the CBG. Power-dependent SHG spectra further validate the quadratic dependence of SHG, while comparative analysis with WS2 flakes on a bare Si/Au/SiO2 substrate highlights the critical role of the CBG structure in modulating SHG. This research underscores the potential of CBG-augmented TMDCs for the control of nonlinear optical emissions, suggesting promising applications in photonic devices and selective emission technologies. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Photonic devices

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Multiple-resonance thermally activated delayed emitters through multiple peripheral modulation to enable efﬁcient blue OLEDs at high doping levels

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Aggregate 2024年第5期5卷 349-357页

作者： Yuyuan Wang Zhiwei Ma Junrong Pu Danman Guo Gaoyu Li Zhu Chen Shi-Jian Su Huangjun Deng Juan Zhao Zhenguo Chi PCFM Lab GD HPPC LabGuangdong Engineering Technology Research Center for High-Performance Organic and Polymer Photoelectric Functional FilmsState Key Laboratory of Optoelectronic Material and TechnologiesSchool of ChemistrySun Yat-sen UniversityGuangzhouChina State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of TechnologyGuangzhouChina State Key Laboratory of Optoelectronic Material and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouChina

Organic light-emitting diodes(OLEDs)based on multiple resonance-thermallyactivated delayedﬂuorescence(MR-TADF)have the advantages of high excitonutilization and excellent color ***,the large conjugated planarity of gen-eral MR-TADF emitters makes them easily aggregate in the form ofπ–πstacking,resulting in aggregation-caused quenching(ACQ)and the formation of excimers,which reduce exciton utilization efﬁciency and color *** address these issues,large shielding units can be incorporated to prevent interchromophore interactions,whereas the majority of reported molecules are limited to blue-green light *** work proposes a strategy of incorporating steric hindrance groups atdifferent sites of the B/N core to suppress interactions between chromophore,con-tributing to blue MR-TADF emitters with high photo-luminance quantum yields(PLQYs≥95%)and narrow full width at half maximum(FWHM),and importantly,great suppression of the ACQ ***,blue OLEDs achieve high externalquantum efﬁciencies up to 34.3%and high color purity with FWHM of about 27 nmand CIE around(0.12,0.15),even at a high doping concentration of 20 wt%.

关键词： blue emission color purity multiple-resonance organic light-emitting diodes thermally activated delayedﬂuorescence

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Constructing multifunctional deep-blue emitters with weak charge transfer excited state for high-performance non-doped blue OLEDs and single-emissive-layer hybrid white OLEDs

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Chinese Chemical Letters 2024年第10期35卷 175-179页

作者： Hui Liu Xiangyang Tang Zhuang Cheng Yin Hu Yan Yan Yangze Xu Zihan Su Futong Liu Ping Lu State Key Laboratory of Supramolecular Structure and Materials Department of Chemistry Jilin UniversityChangchun 130012China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China

Deep-blue emitter with high photoluminescence efficiency(PLQY)is highly desirable in ultra-high definition displays and white solid-state *** this work,two deep-blue phenanthro[9,10]imidazole derivatives,PPIS and PPPIS,with hot exciton property are successfully *** to PPIS,the embedded phenyl bridge in PPPIS is able to effectively increase the overlap of frontier molecular *** consequence,PPPIS shows higher oscillator strength and significantly enhanced *** also achieves better electroluminescence performance in non-doped device,showing deep-blue emission with Commission International de l’Eclairage(CIE)coordinates of(0.153,0.087)and the maximum external quantum efficiency(EQEmax)of 8.5%with minuscule efficiency ***,when PPPIS serves as the host for phosphor PO-01,high-efficiency orange phosphorescent device is obtained with high EQEmax of 29.8%and negligible efficiency roll-off at 1000 cd/m^(2).Further,efficient single-emissive-layer white device is assembled via utilizing PPPIS as a blue emitter as well as the host for PO-01 simultaneously,providing warm-white emission with CIE coordinates of(0.429,0.433)at 1000 cd/m^(2),the forward-viewing EQEmaxof 27.2%and maximum power efficiency(PEmax)of 80.1 lm/W,*** studies can establish a viable design strategy for deep-blue emitters in high-performance non-doped blue OLEDs and hybrid WOLEDs.

关键词： Deep-blue emitters Phenanthro[9,10]imidazole Hot exciton Host Single-emissive-layer white device

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Target detection enhancement method through multi-dimensional information differential projection and fusion

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Optics Express 2025年第10期33卷 21116-21131页

作者： Dong, Xue Lan, Yubo Zhao, Zongmin Cai, Chang Zhou, Zhiming Zhang, Tong Han, Pingli Xiang, Meng Liu, Jinpeng Xie, Peiyue Liu, Fei School of Optoelectronic Engineering Xidian University Xi’an710071 China Xi’an Key Laboratory of Computational Imaging Xi’an710071 China National Key Laboratory of Infrared Detection Technologies Shanghai200083 China Beijing Key Laboratory of Advanced Optical Remote Sensing Technology Beijing100094 China

As a powerful detection tool, spectral polarization imaging (SPI) reveals spatial, spectral, and polarization characteristics. When combined with deep learning, its detection capabilities can be further improved. However, SPI requires the acquisition and processing of large-scale data, and it is still facing significant challenges in detecting targets in complex scenes with reduced contrast, loss of spatial structures, and cluttered backgrounds. Hence, an innovative target detection enhancement method via multi-dimensional information differential projection and fusion is presented based on our self-developed SPI systems. It primarily comprises a target retrieval algorithm based on angle of polarization purification and a novel projection and fusion strategy, which can effectively exploit, enhance, and utilize the multi-dimensional distinctions between the target and background. The resulting fused image visualizes these distinctions, thereby highlighting the target from its background. Experiment results demonstrate the efficacy of our method in detecting targets with shielding, camouflage and shape loss in complex natural environments, i.e., grasslands, woodlands, and sky. This significantly enhances scenario comprehension and detection efficiency without extensive computation or model training, making it especially advantageous for military reconnaissance applications. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Open access

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Impact of polymer chemistry on the application of polyurethane/ureas in organic thin film transistors

RSC Applied Polymers

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RSC Applied Polymers 2023年第2期1卷 190-203页

作者： Mu, Youbing Sun, Qian Wan, Xiaobo Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of Education School of Optoelectronic Materials & Technology Jianghan University Wuhan 430056 China

Polymeric thin-film transistor materials have attracted much attention because of their excellent mechanical properties, good low-temperature solution processability and thermodynamic stability. Among many polymers, polyurethane/urea (PUU) is widely used in the construction of organic thin film transistors (OTFTs) due to its excellent mechanical properties, good compatibility with organic semiconductors, high dielectric constant and wide adjustable range of performance. Compared with common polymers, PUU has a significant effect on improving the flexibility of devices and optimizing the threshold voltage and operation voltage of OTFTs. Herein, we summarize the recent progress in using PUU as a semiconductor layer or insulation layer in OTFTs and forecast its future development prospects, hoping to provide helpful guide in the design, synthesis and fabrication of high-performance wearable/stretchable electronic devices. © 2023 RSC.

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Suppressed concentration quenching and tunable photoluminescence in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2) phosphors for full-spectrum lighting

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Light(Science & Applications) 2024年第11期13卷 2688-2698页

作者： Ming Zhao Yeping Ge Yurong Li Xiaoyan Song Zhiguo Xia Xinping Zhang Institute of Information Photonics Technology School of Physics and Optoelectronic EngineeringBeijing University of TechnologyBeijing 10083China College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 10083China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSchool of Physics and OptoelectronicsSouth China University of TechnologyGuangzhou 510641China

Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources,and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield(PLQY).However,the constraint of concentration quenching poses a great challenge for improving the ***,we propose a fundamental design principle by separating activators and prolonging their distance in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2)phosphors to inhibit concentration quenching,in which different quenching rates are controlled by the Eu distribution at various crystallographic *** blue-violet-emitting Rb_(3)Y(PO_(4))2:xEu(x=0.1%–15%)phosphors,with the occupation of Rb1,Rb2 and Y sites by Eu^(2+),exhibit rapid luminescence quenching with optimum external PLQY of 10%due to multi-channel energy ***,as the Eu concentration increases above 20%,Eu^(2+)prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances,resulting in green emission with suppressed concentration quenching,achieving an improved external PLQY of 41%.Our study provides a unique design perspective for elevating the efficiency of Eu^(2+)-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.

关键词： quenching lighting concentration

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Measuring the OAM spectrum of a fractional helical beam in a single shot

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Photonics Research 2024年第11期12卷 2726-2732页

作者： TUSHAR SARKAR JIAPENG CAI XIANG PENG WENQI HE Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection Shenzhen UniversityShenzhen 518060China

We propose and experimentally demonstrate a new technique,to our knowledge,to precisely measure the orbital angular momentum(OAM)spectrum of the fractional helical beam in a single *** is realized using a singlepath interferometer scheme combined with space division multiplexing and polarization *** a combination enables the single-shot recording of multiple phase-shifted interferograms,which leads to extracting the phase profile of the incident fractional helical ***,by adopting an orthogonal projection method,this measured phase is utilized to evaluate the corresponding OAM *** test the efficacy,a set of simulations and experiments for different fractional helical beams is *** proposed method shows enormous potential to characterize the OAM spectrum in real time.

关键词： OAM interferometer polarization

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Efcient soluble PTCBI‑type non‑fullerene acceptor materials for organic solar cells

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Frontiers of optoelectronics 2023年第2期16卷 1-13页

作者： Xiang Gao Fengbo Sun Xinzhu Tong Xufan Zheng Yinuo Wang Cong Xiao Pengcheng Li Renqiang Yang Xunchang Wang Zhitian Liu Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education) School of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Single perylene diimide(PDI)used as a non-fullerene acceptor(NFA)in organic solar cells(OSCs)is enticing because of its low cost and excellent *** improve the photovoltaic performance,it is vital to narrow the bandgap and regulate the stacking *** address this challenge,we synthesize soluble perylenetetracarboxylic bisbenzimidazole(PTCBI)molecules with a bulky side chain at the bay region,by replacing the widely used“swallow tail”type alkyl chains at the imide position of PDI molecules with a planar benzimidazole *** with PDI molecules,PTCBI molecules exhibit red-shifted UV–vis absorption spectra with larger extinction coefcient,and one magnitude higher electron ***,OSCs based on one soluble PTCBI-type NFA,namely MAS-7,exhibit a champion power conversion efciency(PCE)of 4.34%,which is signifcantly higher than that of the corresponding PDI-based OSCs and is the highest PCE of PTCBI-based OSCs *** results highlight the potential of soluble PTCBI derivatives as NFAs in OSCs.

关键词： Non-fullerene acceptor Soluble PTCBI Organic solar cells

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Autonomous driving target detection based on improved YOLOv7 3

Autonomous driving target detection based on improved YOLOv7

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3rd International Conference on Electronic Information Engineering, Big Data, and Computer technology, EIBDCT 2024

作者： Zheng, Bowen Lu, Huacai Li, Ming AnHui Key Laboratory of Detection Technology and Energy Saving Devices Anhui Polytechnic University Anhui Wuhu241000 China

ISBN: (纸本)9781510680449

Aiming at the problems of false detection and missing detection caused by dense vehicle targets, mutual occlusion, and too small targets in automatic driving scenarios, an improved YOLOv7 target detection algorithm is proposed. In the detection task, the SENet module is introduced to learn the feature weights according to the loss function, which can make the effective feature maps have more weight, and the invalid or ineffective feature maps have less weight, so that the training model can achieve better results. The normalization-based NAM attention module is introduced, which reduces the weights of less significant features, making them computationally more efficient while maintaining the same performance. To verify the validity of the experimental results, the experimental results of the improved YOLOv7 were compared with the experimental results of YOLOv5 and the original YOLOv7 model. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Object detection

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