Fig. 3: Characterization of the TTA-UC properties for PdTPBP with Py0-Py4. | Nature Communications

Fig. 3: Characterization of the TTA-UC properties for PdTPBP with Py0-Py4.

From: Red light-driven electron sacrificial agents-free photoreduction of inert aryl halides via triplet-triplet annihilation

Fig. 3

Normalized TTA-UC spectra for PdTPBP with annihilators of (a) Py0, Py1, Py3 and (b) Py2, Py4. The inserted images are the associated TTA-UC pictures. c Upconversion emission spectra of PdTPBP/Py4 with various excitation intensities. d The dependence of the TTA-UC intensity of PdTPBP/Py4 on the incident power density. The fitting lines have slopes of 2.07 (black, below) and 1.05 (red, above) in the low- and high-power regions, respectively. The threshold power intensity (Ith) is 82.5 mW/cm2. e Upconverted delayed fluorescence lifetime (τDF) of PdTPBP/Py3 and PdTPBP/Py1 with a pulsed nanosecond laser at 653 nm as the excitation light. f The change of upconversion (UC) intensity for Py1-Py4 in conjunction with PdTPBP from 293 K to 333 K. c (PdTPBP)= 10 µM, λex = 653 nm, in argon saturated toluene.

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