•   News &Updates
    1. One Phd Position Open; Interested students may contact Prof. Arindam Chowdhury directly
    2. Congratulation to Amitrajit for "Influence of Atmospheric Constituents on Spectral Instability and Defect-Mediated Carrier Recombination in Hybrid Perovskite Nanoplatelets", The Journal of Physical Chemistry C, 2021
    3. Congratulation to Rohita for "Tunable Multiplexed Whole-Cell Biosensors as Environmental Diagnostics for ppb-Level Detection of Aromatic Pollutants" ACS Sensors, 2021 [PDF]
    4. Congratulation to Jaladhar for "Polarization-resolved single-molecule tracking reveals strange dynamics of individual fluorescent tracers through a plasticized (rubbery) polymer network", Physical Chemistry Chemical Physics, 2021[PDF]

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)