Prof. K.C. Singh (KCS) is involved in synthesizing light emitting inorganic and organic materials. Some of the research work carried out presently within organic and inorganic disciplines includes the synthesis of inorganic phosphorescent materials and electro analytical techniques. His main area of research interest is in solution thermodynamic, electrochemistry, phosphor materials and chemical sensors. He has published more than 120 research papers in International. The department has collaborations with foreign as well as national institutes, such as KIER, National Physical Laboratory, New Delhi and UPV. The collaboration with the UPV focuses on the development of new phosphor materials and the use of porous oxides for photovoltaic applications. This expertise will be a key part of this project in developing up/down converters (WP6) to meet M4.
The MDU possess expertise in the following areas:
- 1. New Optical & Electronic Materials
The department has been provided Rs. 80 lakhs this year by the UGC and other agencies. The department is establishing a new material laboratory and two basic instruments have been ordered i.e. a Scanning Electron Microscope (SEM) and a Spectroscope for characterization of materials by absorption, excitation and emission spectra. The synthesis of the materials falls in two categories:
a) Synthesis of organo-metal complexes and fabrication of OLEDs.
Organo-metal complexes are very important for light emitting devices (OLEDs). Their properties can be modified by tailoring organic molecules and complexing them with specific metal ions. Since the work of Van Slyke & Tang from Kodak Company as thin film OLEDs in 1987, there has been special interest in the technology of cold light emitting devices using organic phosphors. These organic phosphors have many advantages for other luminescent materials. Some senior faculty members are involved in synthesizing these materials and over 100 research papers have been published which can be judged by the list of publications. We are proposing to synthesize organo-metal complexes taking molecules with low molecular weights as their properties can easily be tailored with required band gaps and electrons affinities. Purer materials can also be obtained in the form of complexes without any contamination, which is very important in OLEDs. Fabrication of OLEDs needs deposition of these materials on a cleaned substrate and methods such as vacuum deposition, ink jet printing, spin coating etc. will be applied. These materials have advantages like robust design, can be viewed from almost any angle, have better brightness with good clarity, high resolution, low power consumption etc. Keeping these points in view the Department will establish a new material laboratory.
b) Phosphorescent Compounds
Phosphorescent materials are very important technologically. Broadly their applications are classified as (i) display devices represented by cathode ray tube (ii) Detector systems represented by X-ray screens and scientillators (iii) light sources in a number of different fluorescent lamps (iv) other applications, such as electroluminescent materials used in electronics, luminous paints with long persistent phosphorescence. A long list of applications of these compounds can be made. Some representative phosphors will be synthesized in this department giving special attention on lanthanides doping agents. Barium magnesium aluminate is one of the important compounds, which is not only used for fluorescent lamps, but also in plasma display systems. An attempt will be made to devise an easy method of synthesis as well as for structural modification of such compounds. Similarly yttrium based phosphors, which are of importance in flat panel devices, will be synthesized to give economically cheap processes. Long persistent phosphors have diverse applications for lighting systems. New methods for their synthesis will be tried with modified formulations. For synthetic methods of furnace with vacuum systems and with gas passing facilities will be required in the first phase. While a spectrometer for recording emission spectra of these compounds will be required in second phase.
- 2. Thermodynamic Study of Molecular Interactions in Mixtures
Physico-chemical studies of surfactants are important because of their enormous applications in the field of agriculture food technology, biology and medicine, pharmaceuticals, cleaning agents in laundary and floating agents in the benefication of ores. The physico-chemical properties of aqueous surfactant solutions are useful in understanding the aggregation behavior of surfactant as the liquid structural changes in these solutions. Thus the knowledge of molecular interactions operating among the various components of micellar solutions is required to explain the behavior of surfactant in water. Further addition of organic cosolute to water many not only alter the liquid structure but also affect the surface and thermodynamic properties of micellar solution. The question that arises is that are these properties of surfactants exclusively a function of the nature of cosolute or the molecular entitles, if any, in mixed solvent (water + cosolute) play a role? Consequently the thermodynamic study of mixed solvent could provide important information to see the relevance of molecular interactions in mixed solvent in explaining the micellization behaviour of surfactants.