Figure 7
RT PL spectra of (a) all composites (profiles A to K) under 325 nm excitation of a Xe lamp and (b) selected composites probed with the 325 nm laser line of a He-Cd laser, showing a comparison of their absolute intensity. Note that in (a) a longpass filter L38 was employed, thus cutting off the signal below ~ 400 nm. (c) Comparison of normalized PL spectra for selected profiles under the same energy excitation (325 nm) but different excitation density conditions (lamp vs laser). The spectra were vertically shifted for clarity. (d) 14 K PL spectra of selected composites excited with the 325 nm laser line of the He-Cd laser. The insets correspond to an amplification of the UV region and a photograph of the orange/red emission at 14 K for profile C. Profile A corresponds to a continuous electrodeposition and profiles B to K correspond to pulsed electrodeposition. Pulsed electrodeposition profiles have the following relations: Increasing duty cycle (E-B-C-D), increasing (more negative) pulsed potential magnitude (F-B-G-H), and increasing pulse frequency (K-B-I-J). See Table 1 for complete information on profiles.
