Phase change materials (PCMs) show great potential for solar thermal energy application due to the large latent heat and high efficiency. However, it is difficult to implement long-term storage because of the sensitive phase-transition to environment temperature. Here, we report a high-energy organic phase change composite (PCC) by introducing long-chain azobenzene molecule (AZO) into low-cost tetradecyl alcohol (TA) for light-regulated solar energy storage and release. The photo-switch azobenzene can install a new energy barrier and form a supercooling in liquid-phase charged PCC via molecular photo-isomerization and enhanced intermolecular interactions. Moreover, the charged PCC reveals a large latent heat of 239 J g⁻¹ and a high power density of 594 W kg⁻¹ with a suitable degree of supercooling (3.33–7.67 °C) for energy storage near room temperature. It is noted that the optically-controlled energy release by blue light and excellent cycling stability can be obtained. This kind of PCC is a promising candidate for smart and convenient solar energy storage application.

相变材料（PCM）由于潜热大且效率高，在太阳能热应用方面显示出巨大的潜力。但是，由于对环境温度敏感的相变，因此难以长期保存。在这里，我们通过将长链偶氮苯分子（AZO）引入低成本的十四烷基醇（TA）中来报告高能有机相变复合材料（PCC），以进行光调节太阳能的存储和释放。光开关偶氮苯可以安装新的能垒，并通过分子光异构化和增强的分子间相互作用在液相带电PCC中形成过冷。此外，带电的PCC表现出239 J g ^-1的大潜热和594 W kg ^-1的高功率密度具有适当的过冷度（3.33–7.67°C），可在室温附近存储能量。应当指出，可以获得由蓝光进行的光控能量释放和优异的循环稳定性。这种PCC是智能方便的太阳能存储应用的有希望的候选者。