The QY was calculated using a standard method43 (link), which was performed using a Quanta-Phi integrating sphere coupled to a Horiba Fluorolog system. A monochromated Xe lamp was used as an excitation source. Parameters used in the measurement are as follows: excitation wavelength = 440 nm; bandpass values of 2 and 2 nm for the excitation and emission slits; step increments = 1 nm; integration time = 0.1 s per data point. Excitation and emission spectra were collected with the sample directly in the excitation beam path and with a sample offset from the beam path and the empty sphere. A neutral density filter with a known transmission was used to measure the excitation intensity.
Quanta phi integrating sphere
Manufactured by Horiba
The Quanta-Phi integrating sphere is a device used for the accurate measurement of the total luminous flux or radiant flux of a light source. It operates by capturing and integrating all the light emitted by the source, providing a precise and comprehensive assessment of the source's overall light output.
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4 protocols using quanta phi integrating sphere
1
Fluorescence Quantum Yield Measurement
2
Steady-state Photoluminescence Spectroscopy
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Steady-state PL spectroscopy was performed on a Fluorolog-3 spectrophotometer (Horiba Jobin Yvon). Solid-state emission spectra were recorded using the front-face configuration. The excitation and emission slits were adjusted so that the maximum PL intensity was within the range of linear response of the detector and were kept the same between samples if direct comparison between the emission intensity was required. PLQYs were measured using a Quanta-phi integrating sphere (Horiba Jobin Yvon) mounted on the Fluorolog-3 spectrophotometer. The values and errors reported are the mean and standard deviation of three repeat measurements. Emission and excitation spectra were corrected for the wavelength response of the system and the intensity of the lamp profile over the excitation range, respectively, using correction factors supplied by the manufacturer.
3
Steady-state Photoluminescence Characterization
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Steady-state PL spectroscopy
was performed on a Fluorolog-3 spectrophotometer (Horiba Jobin Yvon).
Solid-state emission spectra were recorded in both the front-face
and edge emission configurations. The excitation and emission slits
were adjusted so that the maximum PL intensity was within the range
of linear response of the detector and were kept the same between
samples if direct comparison between the emission intensity was required.
PLQYs were measured using a Quanta-phi integrating sphere (Horiba
Jobin Yvon) mounted on the Fluorolog-3 spectrophotometer. The values
and errors reported are the mean and standard deviation of three repeating
measurements. Emission and excitation spectra were corrected for the
wavelength response of the system and the intensity of the lamp profile
over the excitation range, respectively, using correction factors
supplied by the manufacturer.
was performed on a Fluorolog-3 spectrophotometer (Horiba Jobin Yvon).
Solid-state emission spectra were recorded in both the front-face
and edge emission configurations. The excitation and emission slits
were adjusted so that the maximum PL intensity was within the range
of linear response of the detector and were kept the same between
samples if direct comparison between the emission intensity was required.
PLQYs were measured using a Quanta-phi integrating sphere (Horiba
Jobin Yvon) mounted on the Fluorolog-3 spectrophotometer. The values
and errors reported are the mean and standard deviation of three repeating
measurements. Emission and excitation spectra were corrected for the
wavelength response of the system and the intensity of the lamp profile
over the excitation range, respectively, using correction factors
supplied by the manufacturer.
4
Fluorescence Enhancement near Au Nanospheroids
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Fluorescence was studied under excitation by 532 nm cw Ndlaser. Spectra were recorded at room temperature with a LNcooled charge-coupled-device (CCD) coupled to a grating spectrometer. Absolute fluorescence quantum yield was measured on the Spectrofluorometer Fluorolog-3 (Horiba Scientific) using Quanta-Phi integrating sphere.
For the calculations of the fluorescence enhancement factor and changes in radiative and non-radiative decay rates we used the well-established approach to model fluorescence of a probe dipole (a quantum dot) located near an Au nanospheroid. The calculation scheme has been described elsewhere [38] (link).
For the calculations of the fluorescence enhancement factor and changes in radiative and non-radiative decay rates we used the well-established approach to model fluorescence of a probe dipole (a quantum dot) located near an Au nanospheroid. The calculation scheme has been described elsewhere [38] (link).
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