The values of absorption and fluorescence maxima, extinction coefficients and fluorescence quantum yield of these new heterocyclic fluorophores were obtained and they show highlighting interesting photophysical properties.
The results demonstrated that the highest light intensity and the severe water stress decreased maximum fluorescence (Fm), variable fluorescence (Fv /Fm, quantum yield of PSII photochemistry (ФPSII), Chl and photochemical quenching (qP) but increased non-photochemical quenching (NPQ), minimum fluorescence (F0) and Anthocyanin (Anth).
The InP/ZnS core/shell QDs with maximum fluorescence peak at ~ 530 nm, superior fluorescence quantum yield of 60.1%, and full width at half maximum of 55 nm were applied as an emission layer to fabricate multilayered QD-LEDs.
Fluorescent spectral studies indicated that soluble PBNME was a good blue-light emitter with maximum emission at 415 nm and fluorescence quantum yield of 0.15, while solid-state PBNME film showed its emission centered at 380 nm.
While polymer 5 shows a fluorescence maximum at λe=568 nm (with a fluorescence quantum yield of Φf=7%), a total fluorescence quenching was observed in 8. Far better photovoltaic performance was obtained from solar cells (set up: ITO/PEDOT PSS/active layer/LiF/Al; active layer consisting of 5 or 8b as donor and PCBM as acceptor in a 1 3 ratio by weight) designed from 5 than from 8b.
For the optical properties, the green fluorescent InP/ZnS core/shell QDs with superior fluorescence quantum yield of 60.1% and full width at half maximum of 55 nm were used as an emission layer to prepare multilayered QD-LEDs.
In addition, the bathochromic shift of the maximum absorption (λabs) and the increase in the fluorescence quantum yield (ΦF) were observed by the introduction of phenyl group onto the silyl moieties.
In solution, the spectral position of the absorption maximum, the size of Stokes shift, and the fluorescence quantum yield are considerably affected by ortho-substitution in three or four ortho-positions.
Φ ¯ PSII is the average specific quantum yield of the PSII; Fm/, the maximum fluorescence, and Ft, the steady state fluorescence.
Solutions of these polymers in chloroform exhibit violet fluorescence, having maximum emission wavelength in the range of 412 425 nm and fluorescence quantum yield in the range of 0.11 0.26.
