Article
Physics, Applied
Abu Bashar Mohammad Hamidul Islam, Tae Kyoung Kim, Dong-Soo Shin, Jong-In Shim, Joon Seop Kwak
Summary: This study investigates the effect of current stress on InGaN/GaN multiple-quantum-well flip-chip blue micro light-emitting diodes (mu-LEDs) and reveals the mechanisms of defect aggregation and generation that cause changes in the optoelectronic performance of the devices. The aging test shows that the improvement in crystal quality due to defect aggregation initially enhances the light output power and external quantum efficiency (EQE), but the generation of sidewall point defects eventually leads to performance degradation. The findings highlight the importance of both defect aggregation and generation in understanding the degradation mechanisms of mu-LEDs.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Chuanyu Jia, Chenguang He, Zhiwen Liang, Qi Wang
Summary: The study reveals that utilizing In-component-graded InGaN barrier in InGaN light emitting diodes can enhance radiative recombination rate and decrease efficiency droop. The external quantum efficiencies and efficiency droop of LEDs vary with different designs of InGaN barrier, showing the importance of barrier design in LED performance.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Optics
Hyun Jeong, Ga Hyun Cho, Mun Seok Jeong
Summary: We propose an efficient method to reduce efficiency droop in InGaN QWs by redistributing carrier localization through thermal annealing, resulting in increased internal quantum efficiency (IQE) in this study.
JOURNAL OF LUMINESCENCE
(2022)
Article
Physics, Applied
Xuefeng Li, Nick Pant, Elizabeth DeJong, Abdelrahman Tarief Elshafiey, Rob Armitage, Emmanouil Kioupakis, Daniel Feezell
Summary: In this study, carrier dynamics in c-plane InGaN/GaN LEDs with various emission wavelengths near the green gap were investigated using a small-signal electroluminescence method. The causes of efficiency reduction at longer wavelengths were identified as a decrease in injection efficiency, radiative recombination rate, and an imbalance in Auger-Meitner and radiative terms due to the interplay between carrier-current density relationship and quantum-confined Stark effect. The effects of QCSE, phase-space filling, and carrier-current density relationship on efficiency reduction were examined separately using experimental data and Schrodinger-Poisson calculations.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Ravi Teja Velpula, Barsha Jain, Moulik Patel, Fatemeh Mohammadi Shakiba, Ngo Quoc Toan, Hoang-Duy Nguyen, Hieu Pham Trung Nguyen
Summary: This study mitigates the effect of positive sheet polarization charges in III-nitride light-emitting diodes by employing a lattice matched last QB, effectively reducing electron leakage and promoting hole injection.
Article
Optics
Ryota Ishii, Yuji Koyama, Mitsuru Funato, Yoichi Kawakami
Summary: Through investigating an InGaN quantum well, it was found that threading dislocations are the microscopic origin of thermal droop. As temperature increases, the thermal droop phenomenon intensifies.
Article
Optics
Shengjun Zhou, Zehong Wan, Yu Lei, Bin Tang, Guoyi Tao, Peng Du, Xiaoyu Zhao
Summary: This study proposes the use of InGaN quantum wells with gradually varying indium content to enhance the performance of GaN-based green LEDs. Experimental results demonstrate that green LEDs with gradually varying indium content exhibit higher light output power and lower efficiency droop.
Article
Chemistry, Physical
Siyuan Cui, Guoyi Tao, Liyan Gong, Xiaoyu Zhao, Shengjun Zhou
Summary: This study reports the development of highly efficient indium gallium nitride (InGaN)-based yellow light-emitting diodes (LEDs) with low efficiency droop. By systematically engineering the indium composition in InGaN quantum barriers (QB), the researchers were able to improve electron confinement and suppress polarization field. This resulted in improved radiative recombination rates and reduced efficiency droop in the yellow LEDs. The study provides a feasible solution for high-performance InGaN-based LEDs in the long-wavelength spectral region.
Article
Nanoscience & Nanotechnology
K. Khan, S. Diez, Kai Sun, C. Wurm, U. K. Mishra, E. Ahmadi
Summary: This study reports the observation of self-assembled InGaN/(In)GaN superlattice structure in InGaN film grown on N-polar GaN substrate, with varying In content in each layer depending on growth temperature. By increasing the substrate temperature, a periodic structure was achieved, offering a new pathway for designing and fabricating electronic and optoelectronic devices with enhanced performance.
Article
Multidisciplinary Sciences
Woo Jin Baek, Juhyuk Park, Joonsup Shim, Bong Ho Kim, Seongchong Park, Hyun Soo Kim, Dae-Myeong Geum, Sang Hyeon Kim
Summary: InGaN-based micro-light-emitting diodes have the potential to be crucial for next-generation displays. However, efficiency degradations and self-heating issues hinder their development. In this study, Baek et al. demonstrate an epitaxial engineering strategy that reduces lateral carrier diffusion and achieves balanced carrier injection, resulting in high external quantum efficiency and reduced average pixel temperature.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Himanshu Karan, Abhijit Biswas
Summary: This study reports the optical performance of four InGaN/GaN multiple quantum well (MQW) blue LEDs with different bottom base widths, where the introduction of trapezoidal QW structure aids in reducing the piezoelectric polarization field, promoting carrier distribution uniformity, and increasing radiative recombination rate, with LED C showing the best performance.
Article
Chemistry, Physical
Do-Yeong Shin, Taehwan Kim, Ozgun Akyuz, Hilmi Volkan Demir, In-Hwan Lee
Summary: This study presents an improved efficiency design for white LEDs by integrating blue nanorod LEDs with green and red-emitting perovskite nanocrystal films. The design utilizes the localized surface plasmon effect of Ag@SiO2 nanoparticles to enhance the photoluminescence intensity of blue LEDs, while the high-power blue LED backlight improves the perovskite photoluminescence intensity. The resulting white LED with Ag@SiO2 nanoparticle-embedded nanorods demonstrates a 62% increase in photoluminescence intensity compared to planar white LEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Mayada M. Taher, Shahad Al-yousif, Naser M. Ahmed
Summary: This paper discusses the numerical simulations of InGaN/GaN quantum dots in nanowire architecture, exploring the effects of various parameters on laser device characteristics and demonstrating high-efficiency quantum dot lasers achieved through nanofocusing. The nonpolar NW structure exhibits higher emission rates compared to semipolar MQD structures, and the successful development of electrically injected graded surface-emitting lasers is reported.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Analytical
Wei Liu, Zeyu Liu, Hengyan Zhao, Junjie Gao
Summary: This paper investigates the electroluminescence characterization of yellow-light-emitting InGaN/GaN multiple quantum wells (MQWs) with different In content. The simulation results show that high-In-content yellow MQWs exhibit enhanced luminescence efficiency at low injection currents. However, at high injection conditions, the luminescence efficiency of yellow MQWs deteriorates with increasing In content.
Article
Chemistry, Multidisciplinary
Zhenzhuo Zhang, Jing Yang, Degang Zhao, Feng Liang, Ping Chen, Zongshun Liu
Summary: This article investigates the adverse influence of electron leakage on the optical output power of laser diodes and proposes a composite last quantum barrier to overcome the problem of electron overflow. Theoretical calculations demonstrate that the optimized composite last quantum barrier can improve the slope efficiency by 50%, enabling higher optical output power in InGaN-based violet laser diodes.
Article
Engineering, Multidisciplinary
Huaduo Wu, Yuanfei Han, Guangfa Huang, Nan Zong, Jianwei Mao, Huigang Shi, Weijie Lu
Summary: A novel fiber-like structural TiB reinforced titanium matrix composite was designed to achieve a combination of high strength and ductility. Through the improvement of structure and microstructure, the material showed enhanced tensile strength, comparable ductility, higher deformation ability, back stress during loading, and increased strain hardening rate. The higher mechanical response of the TiB/Ti composites is attributed to the introduction of TiB reinforcements with the new fiber-like structure, and the coupling effect of consequent grain refinement, load transferring effect, dislocation pinning effect of the fine TiB particles, back stress strengthening and the higher Schmid factors of prismatic slips.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Xiaoyan Wang, Shaopeng Li, Yuanfei Han, Guangfa Huang, Jianwei Mao, Weijie Lu
Summary: TiC crystals are important reinforcements in metal matrix composites, but they can accelerate fatigue crack propagation and lead to premature fracture. To improve performance, reducing TiC content and minimizing crystal size are recommended.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Oncology
Jiajian Wang, Jie Dong, Yinjian Zhou, Kaiyi Wang, Min Pan, Zaixing Deng, Pengfei Wang, Ying Du, Weiguo Lu
Summary: This study aimed to assess the clinical performance of an HPV E6/E7 mRNA assay (Aptima HPV, AHPV) and AHPV 16 18/45 genotype assay (AHPV-GT) combined with age stratification for triaging women with atypical squamous cells of undetermined significance (ASC-US) cytology. The results showed that AHPV testing with age stratification is effective for triaging women with ASC-US cytology, and AHPV-GT testing may be a proper risk stratification method for women with AHPV-positive ASC-US cytology.
GYNECOLOGIC ONCOLOGY
(2022)
Article
Pharmacology & Pharmacy
Songli Wang, Ruifeng Wang, Nana Meng, Linwei Lu, Jun Wang, Jianfen Zhou, Jiasheng Lu, Qianzhu Xu, Cao Xie, Changyou Zhan, Yao Li, Yang Yu, Weiyue Lu, Min Liu
Summary: In this study, a platelet-based delivery system was developed for the treatment of thrombotic diseases. The system showed superior thrombolytic efficacy and had the ability to inhibit re-embolism, while reducing the risk of hemorrhage.
ACTA PHARMACEUTICA SINICA B
(2022)
Article
Oncology
Jianying Xu, Xuan Rao, Weiguo Lu, Xing Xie, Xinyu Wang, Xiao Li
Summary: This study aimed to identify risk factors for malignant lesions in asymptomatic endometrial polyps (EPs) diagnosed by ultrasound and establish a noninvasive predictor. The study found that abnormal uterine bleeding, large polyps, and blood flow signal in EPs were independent predictive factors for malignancy. A noninvasive predictor combining these factors showed excellent sensitivity and negative predictive value in distinguishing benign and malignant EPs.
FRONTIERS IN ONCOLOGY
(2022)
Article
Microbiology
Yunfeng Fu, Xiao Li, Ying Li, Weiguo Lu, Xing Xie, Xinyu Wang
Summary: This study compares the clinical performance of DH3 HPV assay and HC2 test for cervical cancer screening and finds similar sensitivity and specificity for detecting high-grade lesions between the two tests. DH3 assay has the advantage of providing 92% sensitivity in primary screening strategy.
MICROBIOLOGY SPECTRUM
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Lin Ma, Weicheng Chi, Howard E. Morgan, Mu-Han Lin, Mingli Chen, David Sher, Dominic Moon, Dat T. Vo, Vladimir Avkshtol, Weiguo Lu, Xuejun Gu
Summary: In this study, a registration-guided DL segmentation framework for online cone beam computed tomography (CBCT) image was proposed. By integrating image registration algorithms and DL segmentation models, this framework overcame the issues of low image quality and limited training data, resulting in more accurate segmentation.
Article
Peripheral Vascular Disease
Gang Peng, Weiping Lu, Kai Chen, Xiaodan Yang, Jianguo Wei, Bo Wang, Bingcang Huang
Summary: Fourdimensional CT angiography-CT perfusion (4D CTA-CTP)-integrated technology was used to evaluate the cerebral collateral circulation in patients with acute ischemic stroke (AIS). It was found that the mCTA cerebral collateral circulation score can independently predict the neurological prognosis of AIS patients, while the baseline serum S100B protein concentration cannot independently predict the neurological prognosis of AIS patients.
MICROVASCULAR RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Wenying Yang, Dalong Zhu, Shenglian Gan, Xiaolin Dong, Junping Su, Wenhui Li, Hongwei Jiang, Wenjuan Zhao, Minxiu Yao, Weihong Song, Yibing Lu, Xiuzhen Zhang, Huifang Li, Guixia Wang, Wei Qiu, Guoyue Yuan, Jianhua Ma, Wei Li, Ziling Li, Xiaoyue Wang, Jiao'e Zeng, Zhou Yang, Jingdong Liu, Yongqian Liang, Song Lu, Huili Zhang, Hui Liu, Ping Liu, Kuanlu Fan, Xiaozhen Jiang, Yufeng Li, Qing Su, Tao Ning, Huiwen Tan, Zhenmei An, Zhaoshun Jiang, Lijun Liu, Zunhai Zhou, Qiu Zhang, Xuefeng Li, Zhongyan Shan, Yaoming Xue, Hong Mao, Lixin Shi, Shandong Ye, Xiaomei Zhang, Jiao Sun, Ping Li, Tao Yang, Feng Li, Jingna Lin, Zhinong Zhang, Ying Zhao, Ruonan Li, Xiaohui Guo, Qi Yao, Weiping Lu, Shen Qu, Hongmei Li, Liling Tan, Wenbo Wang, Yongli Yao, Daoxiong Chen, Yulan Li, Jialin Gao, Wen Hu, Xiaoqiang Fei, Tianfeng Wu, Song Dong, Wenlong Jin, Chenzhong Li, Dong Zhao, Bo Feng, Yu Zhao, Yi Zhang, Xiaoying Li, Li Chen
Summary: In patients with inadequate glycemic control using metformin alone, dorzagliatin as an add-on therapy resulted in effective glycemic control with good tolerability and safety.
Article
Infectious Diseases
Yuansu Jiang, Shuangshuang Yang, Shaoli Deng, Weiping Lu, Qing Huang, Yun Xia
Summary: The prevalence and molecular characteristics of tigecycline-resistant carbapenem-resistant Enterobacter cloacae (TCREC) in Southwest China were investigated. The study revealed that ST88 strains carrying the carbapenemase gene NDM-1 were the most common and exhibited resistance to tigecycline. Overexpression of efflux pumps contributed to tigecycline resistance. Effective supervision and management are crucial to prevent the transmission of TCREC isolates.
JOURNAL OF GLOBAL ANTIMICROBIAL RESISTANCE
(2022)
Article
Medicine, Research & Experimental
Yixuan Cen, Tingjia Zhu, Yanan Zhang, Lu Zhao, Jiawei Zhu, Lingfang Wang, Junfen Xu, Tian Ding, Xing Xie, Xinyu Wang, Weiguo Lu
Summary: This study identified a downregulated circular RNA (hsa_circ_0005358) derived from the host gene Gli1 in cervical cancer tissues, which suppressed the migration and invasion abilities of cervical cancer cells by interacting with polypyrimidine tract-binding protein 1 (PTBP1), ultimately reducing cancer metastasis.
MOLECULAR THERAPY-NUCLEIC ACIDS
(2022)
Article
Biotechnology & Applied Microbiology
Yanyi Lu, Lin Zeng, Min Li, Bowen Yan, Dandan Gao, Bangfu Zhou, Weiping Lu, Qinghua He
Summary: This study explored the possibility of identifying common wound infection bacteria in mixed culture using gas chromatograph-ion migration spectroscopy (GC-IMS). The headspace gas of single and mixed cultures of Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa was analyzed, and specific volatile organic compounds (mVOCs) were obtained. The findings suggest that GC-IMS can be used to identify compound bacteria based on specific mVOCs.
Article
Engineering, Mechanical
Weiping Lu, Wen Cui, Xiaogang Zhang, Yali Zhang, Shu Yang, Jian Pu, Junyan Li, Zhongmin Jin
Summary: The friction and wear behaviors between cartilage replacement materials and articular cartilage are crucial for the function and performance of the replacements. This study investigated the difference between cross-shear motion and reciprocal linear motion on the frictional and wear behaviors of cartilage, as well as the effect of bearing surface roughness. The results showed that there was no significant difference between the two motion types. The water contact angle of the bearing surface affected the friction and wear behaviors for low roughness implants, while the surface roughness of the material affected the behaviors for high roughness implants. PEEK was found to be a suitable material for osteochondral implants.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Multidisciplinary Sciences
Jiaqi Hu, Zhiwu Wang, Ruocheng Zuo, Chengcai Zheng, Bingjian Lu, Xiaodong Cheng, Weiguo Lu, Chunhui Zhao, Pengyuan Liu, Yan Lu
Summary: Radiomics-based models using preoperative contrast-enhanced computed tomography (CECT) images were developed to predict clinical outcomes of high-grade serous ovarian cancer (HGSOC). Patients with HGSOC can be accurately stratified into high-risk or low-risk groups for cancer-related death or likely recurrence based on their CT images. These radiomic models provide convincing and reliable non-invasive markers for individualized prognostic evaluation and clinical decision-making.
Article
Biochemistry & Molecular Biology
Qianqian Wu, Mingjing Wei, Lifang Yao, Xiaodong Cheng, Weiguo Lu, Xing Xie, Xiao Li
Summary: Hyperthermia can enhance the sensitivity of epithelial ovarian carcinoma cells with sufficient homologous recombination abilities to PARP inhibitors by impairing homologous recombination efficiency and increasing oxidative stress.
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2022)
