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Photonic Nanodevices and Technologies against Light Pollution
Published in Tuan Anh Nguyen, Ram K. Gupta, Nanotechnology for Light Pollution Reduction, 2023
Elisangela Pacheco da Silva, Elizângela Hafemann Fragal, Ederson Dias Pereira Duarte, Sidney A. Lourenço, Edvani C. Muniz, Thiago Sequinel, Rafael Silva, Eduardo José de Arruda, Vanessa Hafemann Fragal
LED is an electronic device that emits light through solid, semiconductor material such as gallium arsenide (GaAs) or gallium phosphide (GaP), with positive and negative polarities when energized by an electrical current. Figure 13.5a illustrates the basic LED conformation. LED is a semiconductor diode of the type P-N junction, which, when energized, emits visible light – hence LED (Light-Emitting Diode). Light is not monochromatic but consists of a relatively narrow spectral band produced by the electron’s energetic interactions. The light-emitting process by applying an electrical source of energy is called electroluminescence. At any forward-biased P-N junction, within the structure, close to the junction, hole and electron recombination occurs. This recombination requires the energy possessed by the electrons to be released, which occurs in the form of heat or photons of light Figure 13.5b [23].
MOF-based Electrochemical Sensors for Nitrogen Oxide/Carbon Dioxide
Published in Ram K. Gupta, Tahir Rasheed, Tuan Anh Nguyen, Muhammad Bilal, Metal-Organic Frameworks-Based Hybrid Materials for Environmental Sensing and Monitoring, 2022
Raghabendra Samantaray, Soujanya Ghosh, Nityananda Agasti
Another class of MOFs, called electroluminescent MOFs, have been investigated in the development of electroluminescent sensors. These cells are the simplest type of electroluminescent devices, consisting of a thin layer of conjugated polymer placed between two electrodes [42]. Electroluminescent devices can emit light by applying an electrical current or a strong electric field as electrical energy is converted into visible radiation. It is known that electroluminescent devices can be fabricated by using either organic or inorganic electroluminescent materials. MOFs are an organic-inorganic hybrid system that could form attractive electroluminescent materials with the overall advantages of both [42].
Methods of Optical Spectroscopy
Published in Rishat G. Valeev, Alexander V. Vakhrushev, Aleksey Yu. Fedotov, Dmitrii I. Petukhov, A. N. Beltiukov, A. L. Trigub, A. V. Severyukhin, Nanostructured Semiconductors in Porous Alumina Matrices, 2019
Rishat G. Valeev, Alexander V. Vakhrushev, Aleksey Yu. Fedotov, Dmitrii I. Petukhov
As mentioned earlier section(s), electroluminescence emerges under the action of electric field, which changes the potential or kinetic energy of electrons in a solid. During the crystal electroluminescence, the electric energy immediately transforms into the light energy. Moreover, the efficiency coefficient of this process, in some cases, can be as high as 100%.
Effect of space radiation on CTJ new version multijunction solar cells
Published in Radiation Effects and Defects in Solids, 2021
B. R. Uma, Sheeja Krishnan, V. Radhakrishna, Roberta Campesato
Before using these low-cost (LC) solar cells in the satellites, it has to go through the stringent qualification, radiation exposure tests for both electron and proton radiation and full characterization of these solar cells for EOL performances. That is, it is very important to understand radiation-induced degradation. Characterizations of single-junction cells have been well established, but the characterization of TJ cell poses new challenges for characterization techniques (7) In this work, different characterization techniques like IV characteristics under AM0 spectrum, spectral response (SR), electroluminescence and photoluminescence (PL) were used to analyze the pre and post irradiation performance of these cells for different electron and proton doses. The obtained results have been compared with the test results of standard TJ solar cells.
Influence of stabilizers on the structure and properties of Cd x Zn1– x S nanoparticles by sonochemical method
Published in Inorganic and Nano-Metal Chemistry, 2020
Lаla Gahramanli, Mustafa Muradov, Ákos Kukovecz, Ofeliya Balayeva, Goncha Eyvazova
Recently, synthesis and characterization of II-VI group materials in nanoscale have been broad interest. The optic and electric properties of these materials are very interesting and promising material due to associate with quantum measurement effects in comparison with their bulk materials.[1,2] Because II-VI groups materials can be used as a promising material due to wide band gap value for apply many field of industry such as solar cells, photo detectors, optoelectronic devices and lasers.[3] Zinc sulfide is important semiconductor with band gap of 3.6 eV and has potential application areas like flat-panel displays, electroluminescence devices, quantum devices, multilayer dielectric filters, and solar cells.[3–5] Cadmium sulfide (CdS) has a direct band gap is 2.42 eV and used detecting visible radiation. Also, it is used as window material for heterojunction solar cells to avoid the recombination of photogenerated carriers which improves the efficiency of solar cell.[6] As well as, it have potential application fields in light emitting diodes,[6] photo detectors,[7] sensors,[8] address decoders,[9] and electrically driven lasers.[10]
The photocatalytic degradation of methylene blue by green semiconductor films that is induced by irradiation by a light-emitting diode and visible light
Published in Journal of the Air & Waste Management Association, 2018
Chih-Chi Yang, Ruey-An Doong, Ku-Fan Chen, Giin-Shan Chen, Yung-Pin Tsai
Recently, solid-state technology has resulted in the development of compact, lower cost, and environmentally friendly light-emitting diodes (LEDs). An LED is a semiconductor device that emits light in a narrow spectrum, which is produced by a form of electroluminescence. LEDs can emit light of different wavelengths (infrared, visible, or near-ultraviolet), depending on the composition and condition of the semiconducting materials. Other advantages of using LEDs as the light source in a photocatalytic reaction are that they are smaller and they have a longer long life span (more than 50,000 h) than conventional ultraviolet sources. They also do not overheat and are less harmful to the environment (Natarajan et al. 2011a; 2011b).