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The spectrofluorimeter is a versatile instrument designed for the optical characterization of materials, enabling in-depth analysis of the photoluminescence (PL) processes. Its core function is to excite a sample with photons and record the resulting emission spectrum across a broad spectral range, providing detailed information about the optical and electronic properties of the material. The fundamental principle of this system is the detection of PL emission - the light produced by a material after optical excitation. Using incident photons with specific energies allows selective excitation of the electronic transitions. The importance of the spectrofluorimeter lies in its ability to characterize materials by revealing information about electronic structure, defect states, doping levels, purity, and crystalline quality of semiconductors.
Key Capabilities
Key Capabilities
The FINE group uses the Edinburgh Instruments FLS1000 system, which offers advanced features for a wide range of measurements:
Temperature-controlled PL measurements: from 4 K to room temperature, enabled by a liquid helium cryostat.
Multiple measurement modes:
Emission mode (PL): PL spectra are recorded for specific excitation wavelengths.
Excitation mode (PLE): keeps the emission wavelength fixed while varying the excitation wavelength to study deexcitation mechanisms of emission centers.
Time-correlated single photon counting (TCSPC): measures fluorescence lifetimes (from picoseconds to seconds) by registering single photons of a fluorescence signal with temporal resolution.
Excitation sources:
Continuous Xe monocromated lamp (230-1000 nm).
Microsecond pulsed Xe flashlamp (1.5-2.5 μs pulse width, adjustable repetition rate 0.1-100 Hz).
Pulsed LED (256.8 nm, ~1 ns pulse width, adjustable period 50 ns - 50 μs).
Related Publication
Related Publication
The spectrofluorimeter is used in the FINE group to study the temperature evolution of luminescent processes and their characteristics lifetimes in semiconductors. For example, M. García-Carrión et al. (2023) utilized this system to analyze the temperature-dependent photoluminescence properties of γ-Ga2O3 nanoparticles.
Publication List
Publication List
M. García-Carrión et al., “Study of the microstructure and temperature dependent luminescence of Na- and Li-beta gallia rutile compounds”, Materialia, 38, 102302 (2024). https://doi.org/10.1016/j.mtla.2024.102302
M. Tinoco et al., “Controllable synthesis and morphology-dependent light emission efficiency of Zn2GeO4 nanophosphors”, Nanoscale Advances, 6(10), 2722-2727 (2024). https://doi.org/10.1039/D4NA00018H
J. Dolado et al., “Li-doping effects on the native defects and luminescence of ZnGeO microstructures: Negative thermal quenching”, Acta Materialia, 245, 118606 (2023). https://doi.org/10.1016/j.actamat.2022.118606
J. Dolado et al., “Intense cold-white emission due to native defects in Zn2GeO4 nanocrystals”, Journal of Alloys and Compounds, 898, 162993 (2022). https://doi.org/10.1016/j.jallcom.2021.162993
A. Vázquez-López et al., “Temperature-dependent photoluminescence of anatase Li-doped TiO2 nanoparticles”, Optical Materials Express, 12(8), 3090-3100 (2022). https://doi.org/10.1364/OME.465710
J. Dolado et al., “Understanding the UV luminescence of zinc germanate: The role of native defects”, Acta Materialia, 196, 626-634 (2020). https://doi.org/10.1016/j.actamat.2020.07.009
M. García-Carrión et al., “Hybrid solar cells with β- and γ-gallium oxide nanoparticles”, Materials Letters, 261, 127088 (2020). https://doi.org/10.1016/j.matlet.2019.127088
J. García-Fernández et al., “New insights into the luminescence properties of a Na stabilized Ga–Ti oxide homologous series”, Journal of Materials Chemistry C, 8(8), 2725-2731 (2020). https://doi.org/10.1039/C9TC05472C
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