Fig. 2.

Circularly polarized luminescence (upper curves) and total luminescence (lower curves) spectra of the Eu-containing compounds in a Eu : 1 ratio of 1 : 5 with the three optical isomers of N,N′-bis(1-phenylethyl)-2,6-pyridinedicarboxamide, (R,R)-1 (dashed lines), (S,S)-1 (dotted lines), and (R,S)-1 (solid lines), in 6.67 × 10⁻³ M MeCN at 295 K, following excitation at 308 nm. Left: ⁵D₀ → ⁷F₁ transition; middle: ⁵D₀ → ⁷F₂ transition; right: ⁵D₀ → ⁷F₄ transition.