Papers by Keyword: Photoluminescence (PL)

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Authors: Anne Henry, Bo Monemar, Peder Bergman, J. Lennart Lindström, Y. Zhang, James W. Corbett
Authors: Qing Guo Zhang, Li Min Shi, Cheng Li Zhang, Shuang Long Wang
Abstract: A new fluorescent Carbon Quantum Dots-Ionic Liquid (CQDIL) hybrid was synthesized by simple method. This CQDIL exhibited extraordinary stability and enhanced photoluminescence .
Authors: Robert E. Stahlbush, Rachael L. Myers-Ward, Brenda L. VanMil, D. Kurt Gaskill, Charles R. Eddy
Abstract: The recently developed technique of UVPL imaging has been used to track the path of basal plane dislocations (BPDs) in SiC epitaxial layers. The glide of BPDs during epitaxial growth has been observed and the role of this glide in forming half-loop arrays has been examined. The ability to track the path of BPDs through the epitaxy has made it possible to develop a BPD reduction process for epitaxy grown on 8° offcut wafers, which uses an in situ growth interrupt and has achieved a BPD reduction of > 98%. The images also provide insight into the strong BPD reduction that typically occurs in epitaxy grown on 4° offcut wafers.
Authors: Maryam Amirhoseiny, Hassan Zainuriah, Ng Shashiong
Abstract: Nanocrystalline indium oxide (In2O3) thin film was synthesized by thermal evaporation of indium on unheated Si (110) substrates, followed by wet oxidation process. XRD analyses showed the deposited In2O3 film is of high quality and have cubic structure. The Scherrer structural analysis revealed that the In2O3 film grown on Si (110) orientation has nanocrystalline structure with crystallite size of 2.53 nm. Photoluminescence (PL) spectrum showed a strong and broad emission at 574.9 nm with two shoulders at 547 nm and 604 nm which related to oxygen vacancies. Finally, the band gap of nanocrystalline In2O3 as determined from the PL spectrum was 2.15± 0.15eV.
Authors: Meng Lv, Guo Chao Li, Jie Dai, Xia Li
Abstract: In this study, Y2O3 microspheres have been selectively prepared by solvothermal method, without using any template and catalyst carrier. Based on the systematic analysis of the samples, we have discussed the effects of the thermal treatment temperature on the structure of the Y2O3 microspheres. Besides, we have also investigated the effect of microstructure on the photoluminescence properties of the phosphor, and the impact of rare earth ion doping concentration on the emission intensity of the phosphor. Powder X-ray diffraction analysis of the powders confirmed the formation of cubic Y2O3. Scanning electron microscope observation reveals that the as-synthesized powders are spherical particles of diameter of approximately 3 μm at 180 °C. Photoluminescence measurements indicate that the phosphor exhibits strongest emission peak at 612 nm, corresponding to the 5D0-7F2 electric-dipole transition. In addition, highest luminescence efficiency was observed in the phosphor with the rare earth ion doping concentration of 5%.
Authors: G. Munkhbayar, S. Palleschi, F. Perrozzi, M. Nardone, J. Davaasambuu, L. Ottaviano
Abstract: In this study, We demonstrate mono and few layers MoS2 samples on the SiO2(270nm)/Si substrate from bulk MoS2 crystal by micromechanical exfoliation technique. We have systematically studied Atomic Force Microscopy, Raman and PL properties of mono and few layer MoS2 on the SiO2(270nm)/Si substrate. First, we find that the number of layer values dependent the Raman and PL emission. First, Raman intensity area ratio of the MoS2 E12g, A1g and 2LA modes to that area of the Si substrate increased linear with increasing number of layers MoS2. Second, Normalized PL intensity area of the (A) peak decreased linear with increasing number of layers MoS2. The value of those graphs is a method to understand the number of layers the exfoliated MoS2.
Authors: Sarla Sharma, Rishi Vyas, Y.K. Vijay
Abstract: Swift heavy ion induced modification in the optical properties of TiO2/Poly (Methyl methacrylate) nanocomposites is reported in this paper. The as prepared anatase TiO2 nanoparticles were uniformly dispersed in PMMA matrix using solution casting method. These nanocomposites were then irradiated with Ag+12 (120 MeV) ion beam and characterized by X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, PL and Raman spectroscopy. The PL spectra exhibited an enhanced broad emission peak in visible region (400 nm - 750 nm) while UV-Vis spectroscopy revealed an increased absorption in visible region in irradiated specimen in comparison to unirradiated sample.
Authors: Yu Jie Chen, Feng Lan Han, Zhao Luo
Abstract: Na2BaMgP2O8 phosphors were synthesized by a standard solid state reaction and their luminescent properties were investigated. The phase structure was analyzed by X-ray powder diffraction measurement. Under the excitation of 365nm, Na2BaMgP2O8:Tb3+, Eu3+ phosphors show two color bands of green and red color due to 5D47F5 transition of Tb3+ ions and 5D07F2 transition of Eu3+ ions, respectively. The emission intensity of Tb3+ deceased with the increasing concentration of Eu3+, which verified that an effective energy transfer occurred from Tb3+ to Eu3+ in Na2BaMgP2O8 host. The present study indicated that the phosphors have a high potential application in solid state lighting.
Authors: Wen Tai Wang, Tak Hyun Kim, Zi Feng Yan, Moses.O. Tade, Qin Li
Abstract: In this work, high quantum yield nanodots were produced by using an organosilane as a coordinating solvent and fabricated the product into solid films. In order to assess the practicality as a material for optoelectronic device, solid state properties were analyzed extensively including UV stability and thermal stability.
Authors: Hung Lin Lee, Tu Lee, Zheng Xin Liu, Meng Hsun Tsai, Yee Chen Tsai, Tsung Yan Lin, Shao Liang Cheng, Sheng Wei Lee, Jung Chih Hu, Lien Tai Chen
Abstract: The sensors of taste and odor play important roles of recognition as well as reception. In our research, the taste and odor sensing capabilities were based on the photoluminescence (PL) responses of luminescent metal-organic frameworks (MOFs). For the sensing of taste, [In(OH)(bdc)]n (bdc = 1,4-benzenedicarboxylate) and [Tb(btc)] (MOF-76, btc = benzene-1,3,5-tricarboxylate), were tested on aqueous solutions of five basic tastants such as sucrose (sweet), caffeine (bitter), citric acid (sour), sodium chloride (salty) and monosodium glutamate (umami). The photoluminescence (PL) responses of polyacrylic acid-chelated [In(OH)bdc]n and lanthanide Tb(btc) were used to demonstrate the applicability of MOF-based biomimetic tongue through: (1) identification of five tastes: sweet, bitter, sour, salty and umami, by 3-D PCA (principle component analysis) to distinguish the corresponding tastants, (2) quantification of the strength of five tastes determined by the relationships between the PL intensity and the τ scale of taste. For the sensing of odor, [In(OH)(bdc)]n and [Zn4O(bdc)3] (MOF-5) were exposed to the odorants such as cumin, cinnamon, vanillin, p-xylene, m-xylene, o-xylene, water, and ethanol. Similarly, the MOF-based biomimetic nose could distinguish the odors of the analytes based on a pattern recognition method (i.e., principal component analysis) constructed by the 2-D map of PL emission responses.
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