Table 1 Photophysical properties of Eu(III) complexes (Fig. 3a (2), Fig. 6a, b (3–4))^11,35,36.

	^aε_max (M⁻¹cm⁻¹)	^aε₄₅₀ (M⁻¹ cm⁻¹)	^bε_tot/%	^cI_max (M⁻¹ cm⁻¹)	^cI₄₅₀ (M⁻¹cm⁻¹)
3^35,36	25,200	≃0	59	1.5 × 10⁴	≃0
4¹¹	—	600	18	—	1.1 × 10²
2	235,400	1700	36	8.5 × 10⁴	6.1 × 10²

^aMolar absorption coefficient at absorption maxima (3: 306 nm, 2: 309 nm) and 450 nm. The ε₄₅₀ value of 4 is the molar absorption coefficient of the Ir(III)-based photosensitizer moiety at 451 nm¹¹
^bλ_ex = 370 nm (3), λ_ex = 480 nm (4), λ_ex = 450 nm (2)
^cI_max = ε_max × Φ_tot, I₄₅₀ = ε₄₅₀ × Φ_tot. Here, Φ_totc is dimensionless

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