For the first time, a series of photochromic dyes SP1-3 with dual-responsive thermally activated delayed fluorescence (TADF) characteristics were reported in this research. Benefitting from the reversible light-responsive property of SP1-3, the eigen TADF of these compounds could be regulated between 588 and 678 nm or turned on/off by different wavelengths of light irradiation in a polyvinylpyrrolidone (PVP) matrix. The emission lifetime of the spiropyran derivative was prolonged to millisecond level for the first time. Moreover, the delayed fluorescence of SP1 and SP3 could also be manipulated by mechanical force because of the mechanochromistic properties of SP1 and SP3. This research is a significant breakthrough for photochromic materials and may broaden its scope.

第一次，一系列光致变色染料 SP1-3在这项研究中报道了具有双响应热激活延迟荧光（TADF）特性。受益于可逆的光响应特性 SP1-3，这些化合物的本征 TADF 可以在 588 和 678 nm 之间调节，或者通过聚乙烯吡咯烷酮 (PVP) 基质中不同波长的光照射打开/关闭。螺吡喃衍生物的发光寿命首次延长至毫秒级。此外，延迟荧光 SP1 和 SP3 由于机械变色特性，也可以通过机械力来操纵 SP1 和 SP3. 这项研究是光致变色材料的重大突破，可能会扩大其范围。