Erbium (Er${}^{3+})$ ion exhibits efficient broadband emission at 1.53 $\mu$m (4f optical transition 4I13/2 $\to$ 4I15/2), which is promising to achieve better clarity and deeper penetration depth for biological imaging. However, because of the relatively low luminescent level (⁴I${}_{13/2}$, ca. 6500 cm${}^{-1})$ and the tendency of being facile to be quenched by high-energy oscillators such as N-H, C-H, or O-H groups, achieving small molecular Er complexes with intense NIR-II luminescence has remained a challenge. In this work, a series of Er${}^{3+}$ complexes of porphyrinoids and $\beta$-perhalogenated derivatives caped with auxiliary deuterated Kläui ligands were prepared, namely X-1-Er, X-2-Er and X-cis/trans-3-Er (X = H, F, Cl, Br). Interestingly, most of the $\beta$-perhalogenated Er complexes displayed high overall quantum yields ($>$ 0.1% in CH₂Cl₂ and CD₂Cl₂) and long lifetimes ($>$ 8 $\mu$s in CH₂Cl₂ and 11 $\mu$s in CD₂Cl₂).

铒（Er${}^{3+}）$离子在 1.53 处表现出高效的宽带发射$\mu$米（4f光传输4I13/2$\to$4I15/2），有望为生物成像实现更好的清晰度和更深的穿透深度。然而，由于发光水平相对较低（⁴ I${}_{13/2}$，约。6500厘米${}^{-1}）$而且易于被高能振荡器（例如 NH、CH 或 OH 基团）猝灭的趋势，获得具有强烈 NIR-II 发光的小分子 Er 配合物仍然是一个挑战。在这部作品中，一系列的 Er${}^{3+}$类卟啉复合物和$\beta$制备了用辅助氘化 Kläui 配体封端的全卤代衍生物，即X-1-Er、X-2-Er和X-顺/反-3-Er ( X = H、F、Cl、Br )。有趣的是，大多数$\beta$-全卤化铒配合物表现出较高的总体量子产率（$>$CH ₂ Cl ₂和 CD ₂ Cl ₂中含量为 0.1% ）且使用寿命长（$>$8$\mu$CH ₂ Cl ₂和 11中的 s$\mu$_{CD 2} Cl ₂中的s ）。