Fls 1000 spectrofluorometer

TEM images, HAADF-STEM, and EDX-mapping spectra were collected by a JEOL-F200 microscope. XRD patterns were obtained by using the Smartlab instrument (Cu Kα, λ = 1.5406 Å, Rigaku) over a diffraction angle (2θ) range of 3-60° with a step increment of 2θ = 0.02° at a rate of 2° min⁻¹. FTIR spectra were recorded by a Nicolet 560 spectrometer. Solid-state ¹³C NMR spectra were conducted on a JEOL JNM-ECZ-600R/M1 600 MHz spectrometer. The N₂ adsorption-desorption isotherms were determined by a Quantachrome surface area analyzer, and the sample powders were first degassed at 150°C for 24 h. The UV-vis DRS was detected by a Hitachi U-3010 spectrometer. Steady-state PL emission spectra and transient fluorescence lifetimes were obtained by a Jobin Yvon Horiba Fluorolog-3 spectrofluorometer. Temperature-dependent PL spectra were processed on an Edinburgh FLS 1000 spectrofluorometer equipped with Oxford Instruments nitrogen cryostat (Optistat DN) for temperature control. EPR spectra measurements were executed on a JES-FA200 X-band instrument. TG analysis was performed on a NETZSCH instrument in the N₂ atmosphere with a heating rate of 10°C min⁻¹. ICP-OES (iCAP 7000 Series, Thermo Fisher Scientific) was conducted to determine the Pt contents in all the samples.

Steady state photoluminescence spectra were measured on a FLS-1000 spectrofluorometer (Edinburgh). Visible PL was measured using a photomultiplier tube (PMT) as the detector (up to ~850 nm). Near-infrared PL was measured using a wide-range InGaAs detector (600–1700 nm) cooled to −80 °C by liquid nitrogen. The low temperature system was home-built, which included the FLS-1000 spectrofluorometer, a vacuum pump, an Optistat CF2 cryostat (Oxford Instruments), and a temperature controller. Liquid helium was used as the cryogen. The QY of Au₃₈(PET)₂₆ in DCM was measured by an integrating sphere.