Single crystals of undoped and 0.5% Ce 3+-doped calcium metaborate CaB 2O 4 have been grown successfully by micropulling down (μ-PD) technique. The material can find its application in the neutron detection. After the single-phase of CaB 2O 4 was confirmed using X-ray diffraction analysis, optical and scintillation characteristics were investigated. In the transmittance spectra, Ce 3+-doped crystals showed absorption bands around 270 and 320 nm which are ascribed to the transition from 4f ground state to 5d excited state of Ce 3+. Under the 241Am 5.5 MeV α-ray excitation, strong emission peak at 370 nm because of the Ce 3+ 5d-4f transition was observed for Ce 3+-doped crystal, while the undoped crystal showed broad intrinsic emission band around 300-400 nm which is caused by the lattice defects in the host crystal. The absolute light yield was calculated to be about 2200 photons per neutron under 252Cf neutron irradiation.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics