Europium-bearing organic framework with excellent X-ray scintillating luminescence

Two europium-bearing organic frameworks, termed as EuTPO-1 and EuTPO-2 (H3TPO = tris(4-carboxylphenyl)-phosphineoxide), are reported in this work. A series of characterizations of EuTPO-1 and EuTPO-2, such as X-ray crystallography and photoluminescence spectroscopy, was performed to expatiate their structure and physicochemical properties. Both of them are constructed by dimers of the europium-oxygen subunit of [Eu2O16] and TPO molecule. Benefiting from high X-ray stopping attenuation and excellent luminescence efficiency, they emit sufficient luminescence when irradiated with X-rays. Meanwhile, they possess stable light outputs when exposed to high humidities and strong radiation dose, outperforming the commercial scintillator CsI:Tl. This result paves the way for developing new scintillator and enriches the compound of europium-bearing organic framework with X-ray scintillating luminescence.