•   News &Updates
    1. One Phd Position Open; Interested students may contact Prof. Arindam Chowdhury directly

    2. Congratulation to Nithin Pathoor for " Fluorescence Blinking Beyond Nanoconfinement: Spatially Synchronous Intermittency of Entire Perovskite Microcrystals" Angewandte Chemie International Edition, 2018 [PDF]

    3. Congratulation to Nithin Pathoor for " Photoluminescence Flickering of Micron-Sized Crystals of Methylammonium Lead Bromide: Effect of Ambience and Light Exposure" The Journal of Physical Chemistry C, 2018 [PDF]

    4. Congratulation to Dr. Mir Irfanullah for " Sensitized luminescence from water-soluble LaF3:Eu nanocrystals via partially-caped 1,10-phenanthroline: time-gated emission and multiple lifetimes" Dalton Transactions, 2016 [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)
  • Structure/dynamics of amyloid filaments/fibrils relevant for neurodegenerative diseases

Techniques and methodologies used:

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