  The timing and spectral characteristics of four highly efficient, slow fluors
are presented for liquid scintillator solutions using linear alkylbenzene (LAB)
as the primary solvent. The mixtures exhibit high light yields, but with rise
times of several ns or more and decay times on the order of tens of ns.
Consequently, such liquid scintillator mixtures can be used for effective
separation of Cherenkov and scintillation components based on timing in large
scale liquid scintillation detectors. Such a separation, showing high light
yield and directional information, is demonstrated here on a bench-top scale
for electrons with energies extending below 1 MeV. This could have significant
consequences for the future development of such detectors for measurements of
solar neutrinos and neutrinoless double beta decay as well as providing good
directional information for elastic scattering events from supernovae neutrinos
and reactor anti-neutrinos, amongst others.
