Lifespec tcspc

UV–vis spectra were
recorded on a PerkinElmer Lambda 365 spectrometer. Fluorescence measurements
were recorded on an Edinburgh Instruments FLS980 spectrometer equipped
with a PMT 400 detector. Photoluminescence quantum yields were measured
in accordance with IUPAC methodology^{25 (link)} against
a coumarin 102 dye solution in ethanol (purity >99.8%) at an excitation
wavelength of 387 nm (OD at 387 nm for all samples ∼0.1). Integrated
emission intensities were corrected using a detector calibration curve.
Measuring the coumarin 102 quantum yield in an integrating sphere
in the same setup gave a value of 99%, but to calculate the quantum
yield, the literature value of 95% was considered for the quantum
yield of coumarin 102.^{26 (link)} Additionally,
a typical in situ HF + ZnCl₂ treated InP sample was measured
in an integrating sphere in the same instrument to have a PLQY of
84% (Figure S19), confirming the values
obtained in the dye measurements. PL decay traces were collected on
a Edinburgh Instruments Lifespec TCSPC setup with a 400 nm pulsed
laser. The emission was measured at 540 nm. TRPL traces were fitted
with a biexponential fitting curve, after which intensity-weighted
average lifetimes were calculated by the following equation: τ_ave = (A₁τ₁² + A₂τ₂²)/(A₁τ₁ + A₂τ₂), where A_n and τ_n are the nth amplitude and lifetime parameters
obtained from the biexponential fit.^{27 (link)}