Calibration of the spectral sensitivity of instruments for the near infrared region

Abstract

We present an analysis of methods for calibration of the spectral sensitivity of instruments in the near IR region of the spectrum (0.90-2.05 μm), using as an example recording of the luminescence spectra of PbS semiconductor quantum dots using a diffraction monochromator and an InGaAs photodiode as the detector. We show that when high-sensitivity detectors are employed for calibration using the emission spectrum of an ideal black body, the problem of attenuation of the radiation flux is still important. Instead of neutral density glass and mesh light filters for attenuation of the radiation, we propose using UFS ultraviolet optical glasses (together with PS purple glasses), the maximum optical density of which is within the region of maximum spectral sensitivity of InGaAs photodiodes. We give examples of spectral calibration, taking into account instrumental characteristics and the effect of absorption by water vapor in the air, and also corrections of the luminescence spectra of quantum dots.

Temperature-Dependent Photoluminescent Properties of PbSe Nanoplatelets

“…PL spectra of CdSe NPLs in the visible range were measured using 405 nm continuous wave laser (Lasever Inc., Ningbo, China) as an excitation source and Si-based CCD-camera (Andor iDus 401, Andor, Belfast, Northern Ireland) as a detector. All spectral data were corrected by the spectral sensitivity of the setup obtained by using the standard spectrum of an ideal black body [ 45 ]. Time-resolved photoluminescence (TRPL) measurements in the NIR were carried out using a single-photon avalanche diode (Micro Photon Devices, Bolzano, Italy) synchronized with 635 nm pulsed (~100 ps, 25 kHz) laser as an excitation source [ 46 ].…”

Photoluminescence of Lead Sulfide Quantum Dots of Different Sizes in a Nanoporous Silicate Glass Matrix

“…Raw PL spectra were normalized, taking into account the spectral sensitivity of the experimental setup in order to extract the emission spectra. 26 ■ RESULTS AND DISCUSSION Nanoporous Silicate Glass Matrix. The surface of the NSM was examined by atomic force and electron microscopies.…”

Interference effects in photoluminescence spectra of Cu2ZnSnS4 and Cu(In,Ga)Se2 thin films

“…An example of a well-known artefact observable in the near infrared and infrared spectral region is absorption lines due to water vapour in the air. 7,8 In addition to PL contributions from the studied material itself, the interpretation may also need to account for PL associated with secondary phases. As an example, ZnSe is a secondary phase commonly present in CZTSe, resulting in characteristic features in the PL spectrum.…”