A Universal Strategy for Organic Fluid Phosphorescence Materials.

It has become an accepted approach to construct room-temperature phosphorescence (RTP) materials by suppressing the non-radiative decay process. However, there is limited success in developing fluid phosphorescence materials due to the ultrafast non-radiation relaxation of vibration and collision of molecules in fluid matrixes. In this study, a universal deep-eutectic-solvent strategy was proposed for developing pure organic phosphorescent fluid materials that are able to generate effective phosphorescent emissions at both room temperature (Φ RTP, 293 K ~ 30%) and even higher temperature (Φ RTP, 358 K ~ 4.53%). Based on these findings, a qualitative analytical method was developed for leak detection and a quantitative analytical technique was further validated to help visually identify the heat distribution of irregular surfaces. This advancement greatly empowers the current organic phosphorescent system offering an alternative approach to determine moisture and heat from non-invasive photoluminescence emission colors.