•   News &Updates
    1. One Phd Position Open; Interested students may contact Prof. Arindam Chowdhury directly
    2. Congratulation to Rohita for receiving "Prof V.S.R. Rao Memorial poster award" at 44th Indian Biophysical Society Meet Conceptual Adavnces in Biophysics and its applications (IBS2022)
    3. Congratulation to Nithin for "Investigating Spatiotemporal Correlation of Multi-state Photoluminescence Intermittency in Organo-Lead Bromide Microcrystal Films", The Journal of Physical Chemistry C, 2022[PDF]
    4. Congratulation to Nithin for successfully defending his Ph.D. thesis "Spatially Synchronous Photoluminescence Blinking of Individual Perovskite Microcrystals"
    5. Congratulation to Jaladhar for successfully defending his Ph.D. thesis "Probing Molecular Interactions and Orientations using Spectrally and Polarization Resolved Fluorescence Microscopy"

Focus: Understand spatiotemporal heterogeneity in semiconductor nanocrystals/heterostructures, soft-materials and biological systems using sub-ensemble and single-molecule fluorescence spectroscopy and diffusion dynamics

Systems of current interest to probe extent of heterogeneity:

  • Carrier localization in (In,Ga)N quantum-wells (QWs) used for solid-state LEDs
  • Luminescent quantum-dots (QDs), doped/alloyed nanocrystals and nanoaggregates
  • Hybrid/doped perovskite micro-/nano-crystals for solar photovoltaics (PVs) and LEDs
  • Soft matter hydrated networks/gels such as polymers/ionomers and polymersomes
  • Spatial distribution of analytes (ions/molecules) in intracellular media (single-cells)
  • Structural heterogeneity of amyloid fibrils relevant for neurodegenerative diseases
  • Liquid liquid phase separation of proteins and peptides
  • Biosensors

Techniques and methodologies used:

  • Laser epifluorescence and total internal reflection fluorescence (TIRF) microscopy
  • Single-emitter (molecule/nanocrystal/defect) spectroscopy and blinking (emission intermittency)
  • Super-resolution single-molecule/particle tracking (translational and reorientational dynamics)
  • Spectrally resolved fluorescence microscopy (spatially-resolved luminescence spectroscopy)
  • Spectrally resolved sensitization imaging
  • Polarization-resolved fluorescence anisotropy imaging
  • Polarization-resolved single-molecule tracking (PR-SMT)
  • Fluorescence correlation spectroscopy (FCS)
  • Fluorescence lifetime imaging microscopy (FLIM)