Dye confined in metal-organic framework for two-photon fluorescent temperature sensing

Abstract In order to expand the application range of luminescent dye, metal-organic framework (MOF) is applied as a carrier to solve the problem such as low luminescent efficiency and poor stability. Here a two-photon luminescent dye-confined ionic metal-organic framework (iMOF) ZJU-68⊃DMASM was prepared through size confinement and electrostatic interaction. The dye loading content was investigated to obtain maximum luminescent efficiency and it was found that the change of two-photon emission intensity was consistent with that of quantum efficiency. In addition, the composite showed excellent physiological temperature sensing performance from 20 °C to 60 °C with a high relative sensitivity, good water stability and good biocompatibility, possessing great potential to be applied in biological field.