Answers are grounded in this paper and cite their sources.
An electric-field-induced cholesteric-nematic transition on a sample containing a europium chelate guest molecule of little or no polarization shows contrast ratios as high as 9 : 1 for its brilliant red (612 nm) fluorescence.
No takes yet. Share an insight, caveat, or question.
Yu et al. (1977) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: