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Impact of p-AlGaN/GaN hole injection layer on GaN-based vertical cavity surface emitting laser diodes[Invited]

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Chinese Optics Letters 2022年第3期20卷 35-40页

作者： Lei Han Yuanbin Gao Sheng Hang Chunshuang Chu Yonghui Zhang Quan Zheng Qing Li Zi-Hui Zhang State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300401China Key Laboratory of Electronic Materials and Devices of Tianjin School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China Hebei Key Laboratory of Advanced Laser Technology and Equipment Tianjin 300401China Key Engineering Center of Flat-Panel-Display Glass and Equipment Shijiazhuang 050035China

The hole injection capability is essentially important for GaN-based vertical cavity surface emitting lasers[VCSELs]to enhance the laser *** this work,we propose GaN-based VCSELs with the p-AlGaN/p-GaN structure as the p-type hole supplier to facilitate the hole *** p-AlGaN/p-GaN heterojunction is able to store the electric field and thus can moderately adjust the drift velocity and the kinetic energy for holes,which can improve the thermionic emission proc-ess for holes to travel across the p-type electron blocking layer[p-EBL].Besides,the valence band barrier height in the p-EBL can be reduced as a result of usage of the p-AlGaN ***,the better stimulated radiative recombination rate and the increased laser power are obtained,thus enhancing the 3 dB frequency ***,we also inves-tigate the impact of the p-AlGaN/p-GaN structure with various AIN compositions in the p-AlGaN layer on the hole injection capabilit,the laser power,and the了dB frequency bandwidth.

关键词： GaN-based VCSEL hole injection laser power modulation response

Brittle to Ductile Transitions in Magnesium-Aluminum Silicate glass: A Molecular Dynamic Simulation

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SSRN 2023年

作者： Yue, Jiayu Shi, Zuhao Wang, Hao Li, Neng State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Float Glass Technology CNBM Bengbu Design & Research Institute for Glass Industry Co. Ltd Bengbu233010 China School of Materials Science and Engineering Zhengzhou University Henan Zhengzhou450001 China

Alkaline earth aluminosilicate glasses are pivotal in numerous high-end industries and glass applications. In magnesium-aluminum silicate glass systems, variations in magnesium concentration usually exhibit notable impacts on macroscopic elastic properties. Employing molecular dynamics simulations, the fracture behavior of magnesium-aluminum silicate glass under uniaxial stretching was observed at the microscopic scale. The research reveals a non-linear correlation between magnesium concentration and both maximum fracture stress and glass brittleness. Notably, magnesium oxide concentration influences whether the glass fractures brittlely or ductility, while magnesium bias occurs at the ductile fracture and reduced aluminum content occurs at both fractures. From this we could predict the onset of glass fracture failure by changes in the distribution of magnesium and aluminum. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

Surface topography and optical properties of pulsed DC magnetron sputtering derived Nb2O5 thin films

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Surface topography and optical properties of pulsed DC magne...

The 24th International Conference on glass( ICG Congress 2016 Shanghai) (第24届国际玻璃大会)

作者： Gang Li Jiwen Jiang Kewu Jin Xin Cao Kuanxiang Zhang Yong Yang Tingting Yao Genbao Xu Yun Wang Shou Peng State Key Laboratory for Advanced Technology of Float Glass Bengbu Anhui 233000 P.R.China Bengbu Design & Research Institute for Glass Industry Bengbu Anhui 233018 P.R.China State Key Laboratory for Advanced Technology of Float Glass Bengbu Anhui 233000 P.R.China China Triumph International Engineering Co. Ltd. Shanghai 200063 P.R.China Bengbu Design & Research Institute for Glass Industry Bengbu Anhui 233018 P.R.China

Effect of Sncl2··2h2·o Concentration on the Structure and Photocatalytic Performance of Tio2· Nanoparticles Via Volatile Solid Solution

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SSRN 2023年

作者： Yu, Jingyi Wang, Jing Sun, Hao Zheng, Cong Li, Zhiqiang Wu, Sumei Tao, Hualong Yao, Tingting Jiang, Weiwei Wang, Hualin Wang, Nan Liu, Shimin Liu, Chaoqian Ding, Wanyu Zhang, Zhihua Engineering Research Center of Optoelectronic Materials and Devices School of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China State Key Laboratory of Advanced Technology for Float Glass CNBM Research Institute for Advanced Glass Materials Group Co. Ltd Bengbu233000 China

Sn/Cl co-doped TiO2 nanoparticles were synthesized via a novel volatile solid solution using SnCl2·2H2O, HCl and TiO2 as raw materials. The effect of SnCl2·2H2O concentration (0-35.4 mol.%) on thermal effect, crystal structure, morphology, composition, light absorption and photocatalytic performance of TiO2 nanoparticles was investigated by TG-DSC, XRD, SEM, EDS, TEM, HRTEM, SAED, UV-Vis, PL and XPS. Results indicate that Sn and Cl are codoped into TiO2 crystal lattice forming a mixed anatase-rutile TiO2 phase without SnO2 phase as SnCl2·2H2O concentration is below 17.7 mol.%, and more SnCl2·2H2O caused the rutile SnO2 generation and simultaneous rutile TiO2 disappearance. The degradation efficiency of methyl orange reaches 98.7% using 17.7 mol.% SnCl2·2H2O modified TiO2 after 2 h of 15 W UV light irradiation, which is 19.72% and increases by two times compared with that of pure TiO2 (8.98%) after 2 h of 15 W visible light irradiation, both showing the maximum photocatalytic performance possibly due to increased active surface sites, enhanced light absorption and improved separation efficiency of photogenerated electron-hole pairs resulted from small particle size, reduced energy band gap and formation of mixed anatase-rutile TiO2 phases. Reactive species scavenging experiments revealed that O∙-2 and h+ play a dominant role in photodegradation process. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

Reaching Medium Entropy Oxides with Tunable Photoelectrical Properties Based on Cluster-Plus-Atom Model: A Case Study of Co-Ni-Cu-Zn-O System with Rocksalt Structure

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SSRN 2024年

作者： Sun, Hao Liu, Shimin Yu, Jingyi Zheng, Cong Li, Zhiqiang Yao, Tingting Wang, Hualin Jiang, Weiwei Zou, Cunlei Zhang, Jiliang Dong, Chuang Wang, Nan Liu, Chaoqian Ding, Wanyu Zhang, Zhihua Engineering Research Center of Optoelectronic Materials and Devices School of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China State Key Laboratory of Advanced Technology for Float Glass CNBM Research Institute for Advanced Glass Materials Group Co. Ltd Bengbu233000 China

Medium entropy oxides (MEOs) as a new type of materials have shown great promise for photoelectrical applications, but the multi-component nature of their compositions makes it difficult to synthesize single-phase MEOs, especially when the cations are not equimolar. In this paper, we have designed and synthesized a series of non-equimolar Co-Ni-Cu-Zn-O single-phase rocksalt structure MEOs via cluster-plus-glue-atom model, thermodynamic calculation and solid-state reaction method. Results indicated that Co21Ni43Cu16Zn16O96 and Co17Ni47Cu16Zn16O96 have the lowest single-phase formation temperature (850 °C). The further variation of Co content will increase the single-phase formation temperature (900-1200 °C) which is closely related to the increased Gibbs free energy and average cation-size difference (δ). The decrease of Co content can increase the energy band gap from 1.52 eV to 1.93 eV and simultaneously increase the electrical resistivity of Co-Ni-Cu-Zn-O system. The proposed method may comprehensively guide the design and synthesis of other single-phase MEOs beside Co-Ni-Cu-Zn-O system. © 2024, The Authors. All rights reserved.

关键词： Free energy

Effects of alkali ion transverse migration on imprinting GRIN microstructure in GeS 2 -Ga 2 S 3 -NaCl glasses for visible to mid-infrared microlens arrays

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Optical Materials 2025年

作者： Qingqiao Fu Meng Zhang Yaoyao Mo Yinsheng Xu Andrey Lipovskii Bin Liu Xiaopeng Liu Guang Yang School of Materials Science and Engineering Shanghai University Shangda Rd. 99 Baoshan Shanghai 200444 China State Key Laboratory of Silicate Materials or Architectures Wuhan University of Technology Wuhan 430074 China Laboratory of Multifunctional Glassy Materials World-Class Research Center “Advanced Digital Technologies” Peter the Great St. Petersburg Polytechnic University Polytechnicheskaya 29 St. Petersburg 195251 Russia Technology Center China Triumph International Engineering Co. Ltd. Shanghai 200063 China Technology Center China Yaohua Glass Group Co. Ltd. Qinhuangdao 066000 China

Gradient refractive index (GRIN) microlens arrays are widely applied in complex optical systems, such as microimaging, biosensing and optical communication, due to their small size, good integration, and ability to solve the color difference with bandwidth. GeS 2 -Ga 2 S 3 -NaCl chalcohalide glass samples with GRIN structures were imprinted by microthermal poling with Ni grid and chalcohalide glass as an improved anode. The effects of enhanced transverse migration of Na + on the surface morphology, optical properties, and internal structure of the poled samples were investigated. In spite of a saturated poling region, the saturation of the number of diffraction orders of the 20% NaCl samples increases from 7 to 8, due to increase of the maximal phase difference from 0.14λ to 0.16λ compared with Ni grid and Si wafter as a previous anode. EDS and XPS analysis confirm that the improved anode promotes the average amount of transverse migrated Na + increased more than twofold in both 20% NaCl and 15% NaCl samples poled with the improved anode compared with previous anode. The improved anode achieves a poling printing effect on the sample with low ion content with the same GRIN characteristics as on the samples with high ion content with previous anode. The transverse migration distribution of the ions also provides a new way for the design and preparation of ultra-thin diffractive optical elements.

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Influence of Thermal Treatment on Properties and Hydrophilic Performance of TiO2 Thin Films

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Influence of Thermal Treatment on Properties and Hydrophilic...

The 24th International Conference on glass( ICG Congress 2016 Shanghai) (第24届国际玻璃大会)

作者： Cao Fangfang Jin Liangmao Wang Yun Peng Cheng Bengbu Design & Research Institute for Glass Industry Bengbu 233000 China State Key Laboratory of Advanced Technology forfloat glass technology Bengbu 233000 China

Effects of Target-substrate Distance on Properties of AZO Thin Films Prepared by DC coupled RF Magnetron Sputtering at Low Temperature

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Effects of Target-substrate Distance on Properties of AZO Th...

The 24th International Conference on glass( ICG Congress 2016 Shanghai) (第24届国际玻璃大会)

作者： Kuanxiang Zhang Tingting Yao Rumei Zhong Jiwen Jiang Yong Yang Gang Li Xin Cao Yun Wang Genbao Xu State Key Laboratory of Advanced Technology for Float Glass Bengbu 233000 China Bengbu Design & Research Institute for Glass Industry Bengbu 233018 China Anhui Bengbu Huayi Conductive Film Glass Co.Ltd. Bengbu 233000 China Bengbu Design & Research Institute for Glass Industry Bengbu 233018 China

Hydrothermal Modification of Calcined Diatomite with Cao: Effect of Naoh Pretreatment

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SSRN 2023年

作者： Guo, Zhengzheng Ren, Zijie Gao, Huimin Guan, Junfang Li, Peiyue He, Yuhao Chen, Zhijie Hubei Key Laboratory of Mineral Resources Processing and Environment School of Resources and Environmental Engineering Wuhan University of Technology 122 Luoshi Road Wuhan430070 China State Key Laboratory of Advanced Technology for Float Glass China Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology SydneyNSW2007 Australia

The development and application of high-adsorptive calcined diatomite (C-D) can provide a cost-effective solution for the filter aid industry, which remains a challenge in this field. Herein, an alkali (NaOH) pretreatment was introduced before the calcium oxide (CaO)-mediated hydrothermal activation of C-D. The adsorption performance of the alkali-modified samples (modified calcined diatomite: M-D) was significantly improved. The methylene blue trihydrate (MB) adsorption capacity of the optimal M-D sample reached 45.76 mg/g, which was 2.73 times higher than that of the sample prepared without the alkali treatment. The substantial enhancement in adsorption performance of M-D was mainly attributed to the abundant SiO32- species which was primarily generated during the NaOH pretreatment. By regulating the amount of NaOH, it was feasible to control the morphology/nanostructure and composition of the final materials. This work paves the way to the value-added application of natural diatomite resources via providing an efficient modification method to optimize the properties of C-D. © 2023, The Authors. All rights reserved.

关键词： Sodium hydroxide