Luminescent Perovskite Nanocrystals


Luminescent perovskite nanocrystals (PNCs) are receiving great scientific attention due to their narrow emission with exceptionally high photoluminescence quantum yields and facile tunability of optical band gap over the entire visible region. In addition to photoluminescence, they exhibit fascinating properties such as defect tolerance, tunable morphologies, multiple exciton generation, charge generation and amplified stimulated emission, etc. We focus on the synthesis, photophysical, and optoelectronic properties and applications of PNCs.

Fluorescent materials for security printing


Counterfeiting of currencies, documents, medicines, and consumer goods is a global problem resulting in huge economic losses to the nation and reputed companies. Anti-counterfeiting continues to be a national challenge due to the lack of suitable indigenous technologies. We are developing fluorescent dyes, pigments, inks, and fibers with unique signatures for security printing.

Lead-Free Perovskites 


Lead-free perovskite materials are gaining significant research attention owing to their excellent moisture stability and less toxicity compared to their lead-based analogous. The optical and electronic properties such as band gap, photoluminescence, exciton binding energy, photoconductivity, charge carrier mobility, etc. could be desirably fine-tuned by modulating the composition of the perovskite materials. Our research team is mainly working on the design and synthesis of novel lead-free hybrid perovskite single crystals with a special emphasis on bismuth halide perovskites for various optoelectronic applications.

Stimuli Responsive Organic Small Molecules


Reversible switching of solid-sate fluorescence with high contrast and reproducibility is a challenging task but important for several optoelectronic applications. One promising approach towards this end is to control the mode of solid-state packing of luminescent organic chromophores with an external stimulus. Fluorescent solids exhibiting reversible change in emission of color or intensity upon external stimuli has potential applications in various sensors, smart windows, optical recording, thermochromic coatings, data storage devices and security printing. We focus on the synthesis, photophysical and optoelectronic properties and applications of stimuli responsive small organic chromophores.

Thermoelectric Materials


Thermoelectric materials, which can be applied in highly efficient cooling and refrigeration, energy scavenging, sensing, and thermopower systems, can make significant contributions to solve the global energy crisis by providing a sustainable energy solution. We are working on the development of thermoelectric modules from novel organic, organic-inorganic hybrid materials, its characterization and detailed study of their photophysical properties.