•   News &Updates
    1. One Phd Position Open; Interested students may contact Prof. Arindam Chowdhury directly
    2. Congratulations to Tejmani for bagging the best poster award at EOPP-22 conference at IIT Roorkee
    3. Congratulation to Nithin for “Deciphering effective modes of communication between spatially-segregated photo-carriers leading to emission intermittency of entire micro-crystals", ACS Photonics, 2022
    4. Congratulation to Somnath for “Edge vs. Interior Mn(II) doping in 2D Layered Butyl Ammonium Lead Bromide Perovskite Single Crystal”, The Journal of Physical Chemistry C, 2022
    5. Congratulation to Tejmani for "Insights on anisotropic emission of (diffused) photo-carriers in hybrid perovskite microrods", The Journal of Physical Chemistry C, 2022
    6. Congratulation to Tejmani for "Deciphering modes of long-range energy transfer in perovskite crystals using confocal excitation and wide-field fluorescence spectral imaging", Methods and Applications in Fluorescence, 2022[Click here]
    7. 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)
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)