Origin lab software version 8

All statistical analyses were performed using Origin Lab software version 8.0 (Origin Lab, Northampton, MA, USA). The statistically significant differences between groups were determined by two-tailed paired Student’s t-test. p < 0.05 was considered statistically significant.

First, the glass substrates with 1 cm × 2 cm dimensions were cleaned, as reported in our recent work [14 (link)]. Next, PFO and MEH-PPV were dissolved separately in toluene with concentrations of 30 and 0.5 mg/mL, respectively, as stock solutions. Thereafter, the three materials (PFO, MEH-PPV, and PQDs) were premixed by a solution blending method with various weight ratios of PQDs (0.0, 0.5, 1.0, 3.0, 5.0, 7.0, and 10 wt.%). For this purpose, the concentrations of PFO and MEH-PPV in all the samples were fixed at 15 and 0.5 mg/mL, respectively, while that of PQDs varied at 3.80, 2.67, 1.68, 0.80, 0.15, and 0.08 mg/mL. Afterward, 50 mL of each sample was dropped onto the cleaned glass substrates and followed by spin-coating at 3000 rpm for 30 s to afford homogenous thin films.
Ultraviolet–visible (UV–vis) spectrometry utilizing a JASCO V-670 spectrometer (JASCO, Cremella, Italia) and a spectrofluorometry (JASCO FP-8200) (JASCO, Cremella, Italia) were employed to analyze the absorption and photoluminescence spectra, respectively. Afterward, the data of the absorption and emission were analyzed by OriginLab software, version 8.0 (Northampton, MA, USA) to determine the parameters of energy transfer. All the measurements were performed in an ambient atmosphere.