Time-Resolved Fluorescence Spectroscopy

Time-resolved fluorescence spectroscopy carries information on the molecular processes in the excited state.  A few techniques allow measuring fluorescence dynamics at different time scales using the same experimental setup:

  • fluorescence upconversion,
  • time-correlated single-photon counting (TCSPC),
  • phosphorescence.

In the fluorescence upconversion experiment, the signal from the sample is mixed in a nonlinear crystal with a gating femtosecond pulse to achieve high temporal resolution, which is limited by the duration of the gate and pump pulses. For fluorescence decay times in the nanosecond to microsecond range, the instrument can be used in time-correlated single-photon counting (TCSPC) mode to measure kinetic traces up to 5 μs. TCSPC technique can be further expanded to measure ultra-long fluorescence dynamics, for example, phosphorescence, lasting for milliseconds. The combination of these three time-resolved fluorescence techniques enables the measurement of spectrally-resolved fluorescence decay in the femtosecond to the millisecond range.

The HARPIA-TF is a time-resolved fluorescence measurement module that combines fluorescence upconversion and TCSPC techniques. With the use of a high repetition rate PHAROS or CARBIDE femtosecond laser, the fluorescence dynamics are measured while exciting the samples with pulse energies down to several nanojoules.

  • Femtosecond-to-microsecond measurements
  • Automated switching between fluorescence upconversion and TCSPC
  • Automated spectral scanning and calibration
  • Optional operation as a stand-alone unit
  • Market-leading sensitivity
  • 330 nm – 24 μm spectral range
  • Probe delay ranges from 2 to 8 ns
  • Pump pulse energies down to nJ
  • Cryostat and peristaltic pump support
  • 100 fs – 20 ps tunable pulse duration
  • 4 mJ maximum pulse energy
  • 20 W maximum output power
  • Single-shot – 1 MHz repetition rate
  • BiBurst
  • Automated harmonic generators (up to 5th harmonic)
  • 190 fs – 20 ps tunable pulse duration
  • 2 mJ maximum pulse energy
  • 80 W maximum output power
  • Single-shot – 2 MHz repetition rate
  • BiBurst
  • Air-cooled version
  • 190 – 16000 nm tuning range
  • Single-shot – 2 MHz repetition rate
  • Up to 80 W pump power
  • Up to 2 mJ pump pulse energy
  • Completely automated

Dopamine Photochemical Behaviour under UV Irradiation

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Electron–Hole Binding Governs Carrier Transport in Halide Perovskite Nanocrystal Thin Films

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Size-dependent spectroscopic insight into the steady-state and time-resolved optical properties of ZnO photocatalysts

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Germanium-lead perovskite light-emitting diodes

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