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Nagpur, India

Rashtrasant Tukadoji Maharaj Nagpur University , formerly known as Nagpur University, was established on August 4, 1923 in the city of Nagpur in the Maharashtra state of central India. Named after Tukdoji Maharaj, its focus was in teaching languages of India, including Sanskrit, Marathi, Hindi and Urdu. The institution has offered a medical degree since 1947. The university was divided on May 1, 1983, when some of its facilities were rededicated to the creation of Amravati University. It is the member of Association Of Indian Universities. It has been accredited with the highest, A Grade by the National Assessment and Accreditation Council , New Delhi. It is now labeled as one of the toughest universities in the country due to its strict assessment and extremely high standards of academia. It has also once been ranked amongst some of the top Universities in India. Wikipedia.

Thejokalyani N.,Laxminarayan Institute of Technology | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Renewable and Sustainable Energy Reviews | Year: 2014

This paper emphasizes on the novel approaches for energy efficient and eco-friendly solid state lighting. Limitations and global haphazards of currently used lighting systems such as Incandescent lamps, compact fluorescent lamps can be overcome by replacing the present lighting system by green technology called solid state lighting, which is possible only with organic light emitting diodes (OLEDs) and polymer light emitting diodes (PLEDs). This paper also explains important characterization techniques used to evaluate the performance, efficiency, life time; colour rendering index (CRI), Internationale de l'Eclairage (CIE) coordinates and correlated color temperature (CCT) of OLEDs. Review of literature on red, blue, green (RBG) light emitting materials and OLED devices is illustrated since the very first synthesized complex and a range of device architectures are presented and appraised. Measures to increase the efficiency and the life time of OLEDs and handling the degradation issues of the organic materials for OLEDs are also discussed. With these measures if we succeed in improving the efficiency, performance and life time, the present lighting system can be replaced by eco-friendly, energy efficient green technology called Solid state lighting, which would play a significant role in reducing global energy consumption. © 2014 Elsevier Ltd. All rights reserved.

Shinde K.N.,Ns Science And Arts College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Critical Reviews in Solid State and Materials Sciences | Year: 2014

As a new class of inorganic phosphor, orthophosphate phosphors materials have received great interest because of their potential applications in solid-state lightings and displays. In this article, we focus on current developments in the synthesis, crystal structure and luminescence properties of orthophosphate phosphors for solid-state lightings. We discuss the synthesis of a family of orthophosphate phosphor doped with europium (Eu2+ and Eu3+) by traditional and novel methods. In the fluorescent lamp, phosphor materials convert UV radiation into visible radiation. Lamp phosphors are mostly white in color and they should not absorb the visible radiation. New phosphors that can absorb excitation energy from blue or near ultraviolet (n-UV) LEDs and generate visible emissions efficiently are desired. The criteria of choosing the best phosphors, for blue (450-480 nm) and n-UV (380-400 nm) LEDs, strongly depends on the absorption and emission of the phosphors. Here, we will review the status of phosphors for solid-state lightings and prospect the future development. The impacts of doping of europium and photoluminescence properties on orthophosphate phosphors were investigated and we propose a feasible interpretation. © 2014 Taylor and Francis Group, LLC.

Surface-active potential of biosurfactants produced cost-effectively in curd whey by Pseudomonas aeruginosa strain-PP2 and Kocuria turfanesis strain-J were tested using parameters viz. surface tension (ST) reduction, F(CMC) (highest dilution factor to reach critical micelle concentration) and emulsification index (EI-24) of pesticides; monocrotophos and imidacloprid at extreme environmental conditions. Results have shown that ST reduction of biosurfactants was stable at pH 2-11. High F(CMC) of the biosurfactant in the fermented whey at low pH improved emulsification of pesticides. ST marginally increased at 5% and 15% NaCl, resulting in high EI-24 and F(CMC). Over a range of temperatures 30-121 °C, ST remained low with a higher F(CMC) and EI-24 at 60 °C than at 121 and 30 °C. The biosurfactants have shown differences in their surface-active property and have marked specificity to emulsify pesticides in extreme environmental conditions. Copyright © 2012 Elsevier Ltd. All rights reserved.

Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Renewable and Sustainable Energy Reviews | Year: 2012

This paper reflects the achievements and the challenges ahead in the field of organic light emitting diodes (OLEDs). The primary intention of this paper is to study different organic materials synthesized so far and the OLEDs fabricated for solid-state lighting. After deep review of literature we have synthesized and characterized rare earth based europium organic complexes Eu(TTA) 3Phen, Eu (x)Y (1-x)(TTA) 3Phen, and Eu (x)Tb (1-x)(TTA) 3Phen, where x = 0.4 and 0.5 by solution technique maintaining stoichiometric ratio. Blended films of pure and doped Eu complexes that are molecularly doped into polymer resins namely polymethylmethacrylate (PMMA) and polystyrene (PS) are prepared according to weight percentage. Concentration effect on absorption and emission spectra of the blended films was studied for different weight percentages (10, 25, 50, 60%). All the complexes doped in PMMA showed an excellent transparency of 90-97% while the complexes doped in polystyrene showed a transparency of 85-90%, bit less than in PMMA. Energy gap of the synthesized complexes have been determined in PMMA and PS. Considering the facts that these complexes have good solubility in most of the organic solvents, the absorption spectra of Eu(TTA) 3Phen, Eu 0.5Y 0.5(TTA) 3Phen and Eu 0.5Tb 0.5(TTA) 3Phen complexes are studied, and OLED devices having the structure ITO/m-MTDATA/α-NPD/TPBi:Eu (x)Y (1-x)(TTA) 3Phen/Alq 3/LiF:Al (where x = 0.4, 0.5) were fabricated and characterized. Significant red emission was observed from fabricated OLED devices at 612 nm when operated in a range of 10-18 V. Thus the synthesized rare earth based organic complexes are the best suitable candidates for fabrication of red OLED devices. The extensive review on OLEDS concludes that our present lighting system can be replaced with white OLEDS, recently developed energy saving lighting technology. © 2012 Elsevier Ltd. All rights reserved.

Thejo Kalyani N.,Laxminarayan Institute of Technology | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Renewable and Sustainable Energy Reviews | Year: 2015

Around 20% of the electrical power generated on the planet is consumed inefficiently in lighting application. With the running out of the fossil fuels; lighting utilization will seriously contribute to the worldwide energy problem in the approaching future. Hence measures are to be taken right from this instant in order to conquer the power shortage problem by efficiently utilizing the available power. White organic light-emitting diodes (WOLEDs) and displays represent the next generation energy-saving light source to alleviate the energy crisis. Within the last decade OLEDs have become an internationally highly recognized unique area light source, which has immense potential for the recent display applications and paves a novel path to create white light. This paper reflects the recent advances in the OLED materials and the critical tactics employed in designing the anatomy of OLED devices for energy-saving solid-state lighting (SSL) towards lighting revolution. Novel transparency electrodes for flexible OLEDs, the stability of OLEDs, topical progress regarding various materials used for different layers to fabricate eco friendly and energy efficient OLEDs by innovative fabrication techniques and the necessity of encapsulation are also discussed. In addition, the ongoing challenges and future perspectives of this research frontier with certain measures that can be employed to reduce the driving voltage, minimize the degradation issues and augmentation of their life time are illustrated. Once we accomplish the said challenges, OLEDs can be considered as next generation flat panel displays and solid state lighting sources, which would proffer a world of expanding opportunities in the field of lighting. © 2014 Elsevier Ltd. All rights reserved.

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