Publications by authors named "Arup Kunti"
Red emission from Mn-containing oxides inspired the development of high color rendering and cost-effective white-light-emitting diodes (WLEDs). Aiming at this fact, a series of new crystallographic site modified (Mg, Ba)MGeO: Mn (M = Al, Ga) compositions were developed with strong deep-red emission in the reaction to UV and blue lights. The MgAlGeO host is composed of three phases: orthorhombic-MgGaGeO, orthorhombic-MgGeO, and cubic-MgAlO.
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- The study explores the use of Mn4+-doped Li3RbGe8O18 (LRGO) as a promising alternative to Eu2+-doped phosphors for white light-emitting diodes (W-LEDs), demonstrating enhanced red emission intensity.
- Different synthesis techniques—solid-state reaction, microwave-assisted diffusion, and microwave-assisted sol-gel—were employed, with the MWS method yielding smaller crystalline nanoparticles (less than 200 nm) and a significant 182% increase in red emission compared to larger particles.
- The final W-LEDs, combining the optimized LRGO:Mn4+,Mg2+ nanophosphor with a yellow-emitting phosphor, successfully adjusted the
Heat Dissipation in Flexible Nitride Nanowire Light-Emitting Diodes.
Nanomaterials (Basel)
November 2020
We analyze the thermal behavior of a flexible nanowire (NW) light-emitting diode (LED) operated under different injection conditions. The LED is based on metal-organic vapor-phase deposition (MOCVD)-grown self-assembled InGaN/GaN NWs in a polydimethylsiloxane (PDMS) matrix. Despite the poor thermal conductivity of the polymer, active nitride NWs effectively dissipate heat to the substrate.
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- The study examines the electrical and optical properties of single GaN nanowire p-n junctions created through plasma-assisted molecular-beam epitaxy with magnesium and silicon as doping sources.
- It compares different junction structures (n-base vs. p-base) using various analytical techniques, highlighting that n-base structures display more wire-to-wire shape variation due to radial growth influenced by magnesium doping.
- By switching to p-base junctions, researchers achieved a more consistent and well-defined structure while maintaining good optical quality and high hole concentration without damaging the nanowire's shape.
Pristine and Eu-doped BaZrO were synthesized via a solid-state reaction method, and the synthesized samples were systematically characterized. X-ray diffraction confirmed the formation of single and pure phases of cubic-structured BaZrO. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed the site occupancy of Eu and coordination environment around the different atomic sites.
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