Constructing charge transfer (CT) state by introducing donor (D) and acceptor (A) is an efficient strategy to regulate the photophysical properties of luminescent materials. Traditional CT-type luminophores are built on π-conjugated fused-ring structures, which always show hybrid CT/locally excited (LE) states and luminescence quenching effect in the aggregate state. In this work, eight conjugated biphenyl (BP) and nonconjugated diphenylmethane (DPM) derivatives with different donors and acceptors are synthesized to investigate the CT properties. Systematic photophysical characterization and theoretical calculation demonstrate that the through-space CT (TSCT) in nonconjugated DA-DPM exhibit superior photophysical performance than the conjugated DA-BP with through-bond CT (TBCT), the main manifestations are as follows: (1) TSCT luminophores produce longer maximum emission wavelength (λ_em) than the corresponding TBCT ones. For example, the longest λ_em of DMA-CN-DPM (DMA, dimethylamino) is 621 nm but the corresponding λ_em of DMA-CN-BP is only 480 nm. (2) TSCT-based DA-DPM demonstrates more sensitive responsiveness to environmental stimuli such as temperature and polarity. (3) Complete separation of the the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) distribution exists in all kinds of conformation of DA-DPM, which was hard to realize in conjugated DA-BP.

通过引入供体（D）和受体（A）构建电荷转移（CT）态是调节发光材料光物理性质的有效策略。传统的CT型发光体基于π共轭稠环结构，总是表现出混合CT/局部激发（LE）态以及聚集态下的发光猝灭效应。在这项工作中，合成了八种具有不同供体和受体的共轭联苯 (BP) 和非共轭二苯甲烷 (DPM) 衍生物来研究 CT 特性。系统的光物理表征和理论计算表明，非共轭DA-DPM中的穿透空间CT（TSCT）比共轭DA-BP结合穿透键CT（TBCT）表现出更优越的光物理性能，主要表现如下：（1） TSCT 发光体比相应的 TBCT 发光体产生更长的最大发射波长 (λ _em )。例如，DMA-CN-DPM（DMA，二甲氨基）的最长λ _em 为621 nm，但DMA-CN-BP相应的λ _em 仅为480 nm。 (2) 基于 TSCT 的 DA-DPM 对温度和极性等环境刺激表现出更灵敏的响应。 (3)DA-DPM的各种构象中最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)分布完全分离，这是共轭DA-BP中难以实现的。