Laser-Spectroscopy Lab {Photophysics: Photoluminescence)

Research Group

We are a small research group focused on Time-domain Spectroscopy at Delhi Technological Univer

Our area of interest :

Nanomaterials/Quantum Dots (QDs) and 2D Materials

QLEDs Materials

Green Synthesis of Nanoparticles

Electric Field Modulation Spectroscopy,

Fluorescent Spectroscopy of Organic/Organometallic molecules and Nanoparticles

Organic molecules and Organic Polymer LEDs (OLEDs)

Solid Thin Films,

Modeling of Materials (DFT/TD-DFT)

Quantum dots are semiconductor crystallites 2 nm - 10 nm in diameter that contain approximately 500-1000 atoms of materials, as cadmium and selenide. Quantum dots fluoresce with a broad absorption spectrum and a narrow emission spectrum. The larger the quantum dots the longer wavelength emitted. The broad absorption spectrum allows many different quantum dots to be excited with one excitation source. The emission spectra for each dot is typically very narrow, on the order of 30 nanometers, which permits spectral resolution of adjacent dots.

Facilities Available

Steady-State spectroscopy:

UV/VIS/NIR Spectrometer (Lambda 750) (Range 190 nm - 32,000 nm)

Integrated sphere

Fluorolog-3 Spectrometer (Double monochromator for Excitation and Emission)

Phosphorescence measurement unit

Low-temperature assembly

Peltier cooled system (-20 deg-100 deg centigrade)

Polarization measurement system.

Liquid Nitrogen Cryostat (77K).

Time-Resolved spectroscopy:

Delta Diode Lasers (05)