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a) Absorption spectra of EH1‐EH3 (c=4.7×10−5–8.7×10−5 m) and H1 in CH2Cl2. Inset right: Photographs of the solutions of EH1‐EH3 under visible light (top) and UV light (bottom). Inset left: Photographs of the powders of EH1‐EH3. b) Normalized absorption (solid lines) and emission (dashed lines) spectra in CH2Cl2 (EH1: λ ex=375 nm, EH2 and EH3: λ ex=400 nm; c=6.2×10−6–1.1×10−5 m).
