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High-efficiency InGaN/AlInGaN multiple quantum wells with lattice-matched AlInGaN superlattices barrier

Chinese Physics B 2017年第1期26卷 488-492页

作者： Feng xu Peng Chen Fu-Long Jiang Ya-Yun Liu Zi-Li xie xiang-Qian xiu xue-Mei Hua Yi Shi Rong Zhang You-Liao Zheng Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 China Nanjing University Institute of Optoelectronics at Yangzhou Yangzhou 225009 China

A new approach to fabricating high-quality AlInGaN film as a lattice-matched barrier layer in multiple quantum wells（MQWs） is presented. The high-quality AlInGaN film is realized by growing the AlGaN/InGaN short period superlattices through metalorganic chemical vapor deposition, and then being used as a barrier in the MQWs. The crystalline quality of the MQWs with the lattice-matched AlInGaN barrier and that of the conventional InGaN/GaN MQWs are characterized by x-ray diffraction and scanning electron microscopy. The photoluminescence（PL） properties of the InGaN/AlInGa N MQWs are investigated by varying the excitation power density and temperature through comparing with those of the InGaN/GaN MQWs. The integral PL intensity of InGaN/AlInGaN MQWs is over 3 times higher than that of InGaN/GaN MQWs at room temperature under the highest excitation power. Temperature-dependent PL further demonstrates that the internal quantum efficiency of InGaN/AlInGaN MQWs（76.1%） is much higher than that of InGaN/GaN MQWs（21%）.The improved luminescence performance of InGaN/AlInGaN MQWs can be attributed to the distinct reduction of the barrier-well lattice mismatch and the strain-induced non-radiative recombination centers.

关键词： AlInGaN superlattices MQWs photoluminescence x-ray diffraction spectrum

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An Investigation of Thermomechanical Behavior of Tunisian Luffa Sponges’ Fibers

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Materials Sciences and Applications 2022年第10期13卷 519-531页

作者： Khaled Kharrati Madiha Salhi Jemaa Sliman Ridha Abdeljabar Laboratory of Technology Energy and Innovative Materials TEMI Department of Physics Faculty of Sciences of Gafsa University of Gafsa Gafsa Tunisia National Engineering School of Gabes Zrig Eddakhlania Tunisia

This work is realized in the context of valorizing natural and local resources, in particular, luffa plant fruit (luffa sponge). The raw fibers of the luffa sponge have a short lifetime. Hence, when they are chemically treated, it constitutes a solution is prepared to limit their degradation in the long term and to improve their mechanical characteristics. Therefore, this paper studies the effect of the chemical treatment on the mechanical properties of the luffa sponge’s fibers (fibers of luffa Sponge). The chemical process consists of dipping a brunch of luffa in various concentrations of sodium hydroxide (NaOH) at different time intervals and at different temperature conditions. The luffa sponge’s fibers were mechanical. Characterized before and after the treatment, mechanically (micro traction test). It has been shown that an optimum of 61% increase in mechanical properties (tensile strength) has been reached in the following conditions: treatment with 1% concentration for 90 min at 50°C.

关键词： Luffa Sponge’s Fibers Chemical Treatment Thermogravimetric Analysis (TGA) x-ray diffraction spectrum Infrared Spectroscopy (IR) Mechanical Characteristics Tensile Strength

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Preparation of Organic Semiconductor PTCDA and Studies on Its Crystal Structure and the Absorption spectrum

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Semiconductor Photonics and Technology 1997年第4期3卷 248-255页

作者： ZHANGFujia LIUFengmin 等 LanzhouUniversity Lanzhou730000CHN BeijingMechanicalIndustryInstitute Beijing100083CHN

Organic semiconductoe 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) has been synthetized with 1,8-naphthalic anhydride using chemical method.x-ray diffraction spectrum shows that it is *** absorption spectrum s... 详细信息

关键词： Organic semiconductor PTCDA Visible Absorption spectrum x-ray diffraction spectrum

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