Highly efficient solid-state luminescence of carbonized polymer dots without matrix

Development of high-performance solid state luminescent carbon-based nanomaterials remains challeng-ing. Here, strong blue-green fluorescent carbonized polymer dots (CPDs) from o-aminobenzenethiol and thiosalicylic acid (oABT-TSA-CPDs) with an absolute photoluminescence quantum yield (PLQY) of 76% in solid state without matrix were synthesized. Through adjusting the reaction temperature and time, the PL centers were proved to be carbon core state and surface state associated to carbonyl group which was the source of strong fluorescence emission in solid state. The mechanism of the unique phenomenon of enhanced emission from ethanol solution (PLQY = 7%) to powder (PLQY = 76%) was investigated by ana-lyzing the chemical properties and structures of oABT-TSA-CPDs at different temperatures and oABT-TSA-CPDs/PVC composites, and was confirmed as fixation of PL centers.(c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.