(a) UV-vis absorption spectra of PMPMA (1) and PCBET (2) films on quartz substrates; (b) photoluminescence (PL) spectra of PMPMA (3) and PCBET (4) films; (c) UV-vis absorption spectra of PVK films (5); (d) photoluminescence (PL) spectra of PVK films (6).
PL Spectra of blended PCBET/PMPMA films were excited at 228 nm (PMPMA absorption position) in different weight mixing ratios. The ∼370 nm emission of PMPMA is left spectra and ∼590 nm emission spectra of PCBET locate at right.
(Color online) PL spectra of blended PCBET/PVK films were excited at PVK absorption 235 nm (PVK absorption position) in different weight mixing ratios. (a) The ∼400 nm emission of PVK (left) and ∼600 nm emission of PCBET (right) at different weight mixing ratios; (b) The simplified figures of spectra (left), Top: intensity of PL of PCBET at ∼600 nm emission, Bottom: intensity of PL of PVK at ∼400 nm emission.
(Color online) PL spectra of PCBET films blended with PMMA at different mixing ratios.
(Color online) AFM images of blended PCBET films with PMMA at a different blend ratios, unit of plane scale is μm, and highness is angstrom. (a) PCBET:PMMA is 8:2; (b) 6:4; (c) 5:5; (d) zoom in for image (a).
(Color online) AFM images of blended PCBET films at 6:4 blend ratios with other polymers. (a) PCBET/PMPMA, (b) PCBET/PVK.
(Color online) (a) The fluorescence decay profile of sample PCBET/PVK that was fitted with single exponential component. The wavelength of excitation light is 337 nm, the emission light is 430 nm for PVK. (a) The lifetime is 21.33 ns at 4:6 ratio of PCBET/PVK. (b) The lifetime is 38.21 ns at 1:9 ratio of PCBET/PVK.
The fluorescence lifetime values of the blended films deposited by spin coating (the wavelength of excitation light is 337 nm).
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