Triplet–triplet annihilation upconversion (TTA-UC) can upconvert low-energy photons to high-energy photons under low excitation intensity with incoherent light source, which has shown great potential in solar cells, photocatalysis, 3D printing, smart luminescence materials, and biological applications. In this review, we focus on the advances of TTA-UC in the application of photochemical transformation, especially the progress of TTA-UC for photocatalytic production of solar fuels and high value-added compounds and the emerging photochemical preparation of organics and polymers. And last, we summarize the value of TTA-UC approaches in these contexts and make an outlook on the future challenge and potential strategies.

三重态-三重态湮灭上转换（TTA-UC）可以在非相干光源的低激发强度下将低能光子上转换为高能光子，在太阳能电池、光催化、3D打印、智能发光材料和生物等领域显示出巨大的潜力。应用程序。本综述重点关注TTA-UC在光化学转化应用中的进展，特别是TTA-UC在光催化生产太阳能燃料和高附加值化合物以及新兴的有机物和聚合物光化学制备方面的进展。最后，我们总结了 TTA-UC 方法在这些背景下的价值，并对未来的挑战和潜在策略进行了展望。