Articles written in Bulletin of Materials Science
Volume 44 All articles Published: 30 August 2021 Article ID 0237
Electronic and optical properties of pristine and metal-doped lithium niobate crystals are investigated by using first-principles DFT calculations. The results on optical properties suggest that there is a shift in the absorption edge towards visible region (red-shift) for metal-doped structures, in comparison with the pristine lithium niobite. A series of metals are used for doping and it is found that the absorption edge is shifted significantly to the visible region for the dopants; gold (Au), silver (Ag), aluminium (Al) and copper (Cu) due to surface plasma resonance. However, for other metal dopants like iron (Fe), manganese (Mn), molybdenum (Mo) and nickel (Ni), the absorption is slightly improved in the visible region and red-shift is observed. The bandgap of all the doped structures is found to be reduced, this might be proven advantageous for photovoltaic applications, which requires high optical absorption in the visible region. The dielectric constant and refractive index of the pristine and doped structures are also calculated and it is observed that the absorption trend is in accordance with dielectric constant. The optical absorption is enhanced in the visible region due to doping of selected metals (M = Au, Ag, Al, Cu, Fe, Mn, Mo and Ni) making M-lithium niobite a promising material for optoelectronic- and photonic-based applications.
Volume 45 All articles Published: 23 June 2022 Article ID 0109
Recent advancements over a decade for organic light-emitting diodes: from structural diversity, role of layers, colour emission, material classification, performance improvement, fabrication to applications
Organic light-emitting diode (OLED) is an emerging technology of organic electronics that exhibits an assortment of salient and attractive features like self-emitting ability, great flexibility, true dark tone, transparency and many more. Along with display applications, OLEDs are prudent for light detection-based applications. Enormous research work has been reported to refine the OLED technology in terms of structures, materials, performance parameters, lifetime and applications. There is a vast scope for developing white OLED devices for utilization in solid-state lighting applications. This review paper summarizes recent advancements in different aspects for OLEDs over the last decade. The main focus is to diversify different multilayer structures of OLEDs highlighting the role and significance of charge injection, charge transport, emission and blocking layers. Also, a timeline analysis for characteristics parameters, layerwise materials and fabrication techniques is presented. Further, different performance improvement techniques based on layers, parameters and colour emission are demonstrated. This article also illustrates prudent applications based on organic thin-film transistor-driven OLED, sensors, military and healthcare. Some challenges and reliability issues are also discussed with a scope for future work for OLED.
Volume 45, 2022
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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