Investigation of temperature-dependent photoluminescent properties of potassium perylene-3,4,9,10-tetracarboxylate (K₄PTC), a molecule with no internal rotational degrees of freedom, shows aggregation-induced enhanced emission at room temperature. The different excitonic emission processes are dependent of temperature, some of which quenches in an intermediate temperature range (from 50 to 150 K). The exciton excited states switching phenomenon from "dark" to "bright" states is observed and its explained using Herzberg-Teller selection rule. K₄PTC is a molecule comparable to the size of its precursor, perylene-3,4,9,10-tetracarboxylic anhydride (PTCDA) and is highly soluble in water, contrary to PTCDA, which is poorly soluble in most solvents. Powder x-ray diffraction measurements corroborate a lesser degree of ordering of bulk K₄PTC compared to bulk PTCDA. The green luminescent molecule could, in principle, be used as a biomarker, or in photodynamic therapy, if further studies show relatively low toxicity.

对苝-3,4,9,10-四羧酸钾 (K ₄ PTC)（一种没有内部旋转自由度的分子）的温度依赖性光致发光特性的研究显示在室温下聚集诱导增强的发射。不同的激子发射过程取决于温度，其中一些在中间温度范围内（从 50 到 150 K）猝灭。观察到激子激发态从“暗”态到“亮”态的转换现象，并使用 Herzberg-Teller 选择规则对其进行解释。ķ ₄PTC 是一种与其前体苝-3,4,9,10-四羧酸酐 (PTCDA) 大小相当的分子，它在水中的溶解度很高，而 PTCDA 在大多数溶剂中的溶解性较差。与本体 PTCDA 相比，粉末 X 射线衍射测量证实本体 K ₄ PTC的有序程度较低。如果进一步的研究表明毒性相对较低，绿色发光分子原则上可以用作生物标志物，或用于光动力疗法。