PersLQY-calculator

Persistent Luminescence Quantum Yield Calculator

Citation:

This code is part of Quantification of Emission Efficiency in Persistent Luminescent Materials, a work which is currently under revision process in Advanced Optical Materials. If you use this software for publication purposes, please contact the authors. Check our group website for updates.

Instalation & Usage:

• Install python3.
• Install the folowing python packages: matplotlib, numpy, pandas and tkinter. This can be done in Windows by running the install.bat file.
• Run the PersLQY_calc.py in python. This can be done in Windows by running the PersLQY.bat file.

Data files:

Before running the script, you will need the following files for each PersLQY measurement:

• Photoluminescence spectra: Text file containing two columns. First column must correspond to wavelength in nanometers, and second column to intensity. Headers should be included as in the following example: wl counts 420 0.00899413512876429 420.5 0.00987102886128422 421 0.0096912224891284 421.5 0.0102467026352578 422 0.0108732897365367 ...................
• Persistent luminescence spectra: Text file containing two columns. First column must correspond to wavelength in nanometers, and second column to intensity. wl counts 420 0.003013006393295 440 0.010150615158934 450 0.0221624961338828 460 0.0573174014402506 470 0.140815487509773 ...................
• Excitation source spectra: Text file containing two columns. First column must correspond to wavelength in nanometers, and second column to intensity. wl counts 390 1157.52478 391 10705.6113 392 19559.9336 393 43986.3203 394 93591.3359 ...................

• Excitation source + Sample spectra: Text file containing two columns. First column must correspond to wavelength in nanometers, and second column to intensity. This corresponds to the excitation intensity which not absorbed by the sample. wl counts 390 1159.19031 391 5666.96094 392 10775.1074 393 22261.3691 394 46993.4414 ...................

• Reference for the time-dependent excitation: Text file containing four columns. First column must correspond to time in seconds, second column to intensity, third column to $t0$ (time in seconds at which excitation starts) and fourth column to $t1$ (time in seconds at which excitation stops). This is used as a reference for calculating the number of photon absorbed during the PersLQY measurement. t counts t0 t1 0 5.66825056 30 330 0.6 5.66825056 1.2 11.3365011 1.8 11.3365011 2.4 5.66825056 ...................

• Neutral density filter measurement: Text file containing two columns. First column must correspond to wavelength in nanometers, and second column to optical density. This file is used to correct measurements in which a filter is used. wl OD 250 0.954242499 250.5 0.999999994 251 0.367976785 251.5 0.221848758 252 0.812913357 ...................

• Time-dependent absorption: Text file containing four eight columns. This correspond to the time-dependent measurement of the excitation intensity which not absorbed by the sample, which is used to calculate the number of photon absorbed during the PersLQY measurement.

  • Column 1: Time in seconds
  • Column 2: Measured intensity
  • Column 3: File name of the reference for the time-dependent excitation file.
  • Column 4: Measured wavelength in nanometers.
  • Column 5: Bandwidth of the measurement in nanometers.
  • Column 6: $t_0$ in seconds
  • Column 7: $t_1$ in seconds
  • Column 8: File name of the neutral density filter file (0 if not used).

t counts ref_file wl0 bth t0 t1 OD 0 5.66825056 ref_400_400.txt 400 13 30 330 0 0.6 1.88941681 1.2 9.44708443 1.8 11.3365011 2.4 5.66825056 ...................

• Time-dependent emission: Text file containing four seven columns. This correspond to the time-dependent measurement of the emission intensity, which is used to calculate the number of photon emitted during the PersLQY measurement.
  • Column 1: Time in seconds
  • Column 2: Measured intensity
  • Column 3: Measured wavelength in nanometers.
  • Column 4: Bandwidth of the measurement in nanometers.
  • Column 5: $t_0$ in seconds
  • Column 6: $t_1$ in seconds
  • Column 7: File name of the neutral density filter file (0 if not used).

t counts wl0 bth t0 t1 OD 0 15.9283524 524 13 30 31.8 0 0.6 17.3763847 1.2 17.3763847 1.8 10.1362247 2.4 13.0322886 ...................

Example:

In the folder examples there are the following files: - LumS.txt: Photoluminescence spectra. - PersS.txt: Persistent luminescence spectra. - source_e400.txt: Excitation source reference spectra. - source_SAO_e400.txt: Excitation source + sample spectra. - ref_400_400.txt: Reference for the time-dependent excitation. - OD1.txt: Optical density of a filter. - sample_400_400.txt: Time-dependent excitation source + sample intensity. - sample_400_524.txt: Time-dependent emission intensity.

After running PersLQY.bat file, the folowing result should appear:

Also, an image named measurement.png should appear in the directory of your measurements: