The performance of metal–organic-framework-based photocatalysts were usually limited by the short lifetime of excited state and the high cost of precious metal complexes in CO₂ photoreduction. To enhance the lifetime of excited state, an organic thermally activated delayed fluorescence photosensitizer was installed with the non-noble zinc node in a periodic structure named Spiro-Zn-MOF. The horizontally prolonged linker based on D-A (D: Donor, A: Acceptor) unit provided a delayed lifetime up to micro-second-level lifetime for excited state, which was inherited in the Spiro-Zn-MOF. And the inborn D-A structure of Spiro-Zn-MOF worked with zinc node in a synergistic way, leading to a large photocathode current in the scaffold allowing for high photoreduction rate. Combination of long-lived excited state and efficient charge transfer in noble-metal-free D-A unit allowed for efficient CO₂ photoreduction with a production rate of CO up to almost 50 μmol h⁻¹ g⁻¹, which far exceeded the performances of zinc-based MOF-5 and commercialized TiO₂ (P25) under the same conditions.

基于金属-有机骨架的光催化剂的性能通常受到激发态寿命短和CO ₂中贵金属络合物成本高的限制光还原。为了提高激发态的寿命，将有机热活化延迟荧光光敏剂与非贵金属锌节点一起安装在名为 Spiro-Zn-MOF 的周期性结构中。基于 DA（D：供体，A：受体）单元的水平延长接头为激发态提供了高达微秒级寿命的延迟寿命，这是在 Spiro-Zn-MOF 中继承的。Spiro-Zn-MOF 的先天 DA 结构与锌节点以协同方式工作，导致支架中的大光阴极电流允许高光还原率。无贵金属 DA 单元中长寿命激发态和有效电荷转移的结合允许有效的 CO _{2 光}还原，CO的产率高达近 50 μmol h ^-1 g^-1，在相同条件下远远超过锌基MOF-5和商业化TiO ₂ (P25)的性能。