C. Pradeep

Studies on the effect of mobile phone radiation on DNA using laser induced fluorescence technique

In the present study we have investigated the effect of mobile phone radiation on deoxyribonucleic acid by using fluorescence technique. Absorption spectra shows increase in absorption of DNA after exposure to radiation from mobile phone with different SAR values and microwave frequency which give information about unwinding of the DNA double strand. Fluorescence intensity of dye doped DNA solution is getting reduced suggesting that the absorbed energy is used for unwinding of double strand of DNA after irradiating with microwave radiation. Unwinding of the DNA is very sensitive to power of the microwave radiation.

Enhanced brightness from all solution processable biopolymer LED

Biopolymer light emitting diodes were fabricated by using all solution processable polymers incorporating biomaterials such as deoxyribonucleic acid lipid complex as an electron blocking layer. Light emission is from a blend of fluorene based copolymers. The devices with electron blocking layer exhibited higher brightness and luminous efficiency. The increased luminance of the multilayer polymer LED is attributed to the contribution from DNA:CTMA as electron blocking layer and PFN, a derivative of polyfluorene, as electron injection layer. Our results show four fold increase in luminance values when DNA is used as electron blocking layer.

Thermal and nonlinear optical properties of Triazatriangulenium salt for applications in all-optical switches

The nonlinear optical properties of triazatriangulenium salt have been investigated using open aperture and closed aperture configuration of transmission Z-scan experiment. The nonlinear absorption coefficient, nonlinear refractive index and third-order susceptibility was calculated. The thermal properties of the salt has been studied using dual beam mode matched thermal lens technique and the thermal diffusivity of the salt has been measured. With the results obtained we propose that the triazatriangulenium salt could be exploited in all-optical switching applications.

PicoGreen dye as an active medium for plastic lasers

Deoxyribonucleic acid lipid complex thin films are used as a host material for laser dyes. We tested PicoGreen dye, which is commonly used for the quantification of single and double stranded DNA, for its applicability as lasing medium. PicoGreen dye exhibits enhanced fluorescence on intercalation with DNA. This enormous fluorescence emission is amplified in a planar microcavity to achieve yellow lasing. Here the role of DNA is not only a host medium, but also as a fluorescence dequencher. With the obtained results we have ample reasons to propose PicoGreen dye as a lasing medium, which can lead to the development of DNA based bio-lasers.

Study on cadmium sulphide nanoparticles on blue and green light emitting polymers

We demonstrate the working of organic-inorganic hybrid light emitting diodes using cadmium sulphide nanoparticles doped in light emitting polymers. Cadmium sulphide nanoparticles were prepared by precipitation technique and doped in active light emitting polymers. We used blue emitting polymer PFO and green emitting polymer F8BT as active polymers. The j-L-V curves of nanoparticles based devices were compared with polymer only standard devices. Our results show enhanced performance such as increased conductivity and higher luminance, when nanoparticle are incorporated into the device.

Silver nanoparticles as radiation absorbers to reduce the effect of mobile phone radiation on DNA

Thermal diffusivity variation in DNA when radiated using mobile phones is studied using thermal lens spectroscopy. The presence of Silver nanoparticles causes thermal diffusivity of the DNA sample to increase, pointing to a probable use as radiation absorbers.