White‐light emitting materials based on single‐molecules are of great interest owing to the simple fabrication process and good stability of such materials. However, among limited reports on single‐molecule white light‐emitting materials, the majority of systems are based on organic solvents. Here, a single‐molecule white‐light emitting hydrogel is prepared through the combination of a protonation sensitive fluorophore with a temperature sensitive hydrogel. The mechanism of this system is based on adjusting the ratio of protonated and deprotonated fluorophores through the thermally controllable hydrophobic property of the hydrogel internal microstructure. The fluorophore emits intense blue and yellow emission in its protonated and deprotonated states, respectively; hence, the luminescence of the hydrogel changes color as a function of temperature and [H⁺], achieving a white color under certain conditions. On the basis of these results, a multicolor light‐emitting device (LED) and a white‐light LED are realized by placing the prepared hydrogel on a conductive substrate over a UV LED chip.

中文翻译：

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刺激响应水凝胶中的可调单分子白光发射

基于单分子的发白光材料由于其制造过程简单和稳定性好而备受关注。但是，在有关单分子发白光材料的报道有限的情况下，大多数系统是基于有机溶剂的。在此，通过将质子敏感的荧光团与温度敏感的水凝胶结合，制备了单分子发白光的水凝胶。该系统的机理是基于通过水凝胶内部微结构的可热控制的疏水性来调节质子化和去质子化的荧光团的比例。荧光团在其质子化和去质子化状态下分别发出强烈的蓝色和黄色发光。因此，⁺ ]，在特定条件下获得白色。根据这些结果，通过将制备的水凝胶放在UV LED芯片上方的导电基板上，可以实现多色发光器件（LED）和白光LED。