Commercial 3D resin blended with TTA functionalized CaWO4:Eu (III), synthesis route and a luminescence study

Abstract

Synthesis and characterization of calcium tungstate-based micro-nanophosphors are reported in the present work. These materials were synthesized by spray pyrolysis technique. According to Scanning Electron Microscopy measurements, CaWO4 and CaWO4:Eu (III) have quasi-spherical shape. CaWO4 presents blue luminescence whose origin is an electron transition within unperturbed WO42− complexes, while CaWO4:Eu (III) luminescent properties are generated by the presence of Eu (III) ions, which produced light emissions at 591, 615, 655, and 702 nm. Such emissions are due to radiative transitions from the excited state 5D0 to 7Fj (j = 1, 4) inter-level transitions within Eu (III) electronic energy states. These phosphors were blended with a commercial 3D print photocurable resin (Sain Smart 101-90-840TS) and their luminescent properties were transferred to resin. Besides in this case, blended 3D resin has an intrinsic blue luminescence due to its π and π* bonds which is activated under 380 nm excitation wavelength, however blended 3D resin can be also activated under 465 nm excitation which only activates Eu (III) ions producing a red emission 3D luminescent photocurable resin.