Exciplexes play an important role in the field of light-emitting materials due to the effective enhancement on fluorescence efficiency through thermally activated delayed fluorescence (TADF) mechanism. This mechanism is also expected to contribute to nonlinear optical applications. Here, we report an exciplex-type TADF material with significant two-photon excited fluorescence (TPEF) properties. It consists of Di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC) as the donor and 1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) as the acceptor. The TAPC:TPBi film emits blue fluorescence (peaked at ∼470 nm) under near-infrared excitation. A very wide long-wavelength excitation window of at least 200 nm (660 nm–860 nm) was observed. The reported exciplex material may have the potential to play an important role in the field of one- and two-photon excited fluorescence.

由于通过热激活延迟荧光 (TADF) 机制有效提高荧光效率，激发复合物在发光材料领域发挥着重要作用。这种机制也有望有助于非线性光学应用。在这里，我们报告了一种具有显着双光子激发荧光 (TPEF) 特性的激态复合型 TADF 材料。它由二-[4-( N , N -二对甲苯基氨基)-苯基]环己烷 (TAPC) 作为供体和 1,3,5-Tris(1-phenyl-1 H-苯并咪唑-2-基）苯（TPBi）作为受体。TAPC:TPBi 薄膜在近红外激发下发出蓝色荧光（峰值在 ~470 nm）。观察到至少 200 nm (660 nm–860 nm) 的非常宽的长波长激发窗口。报道的激发复合材料可能具有在单光子和双光子激发荧光领域发挥重要作用的潜力。