Crystal structure and photoluminescence properties of Eu2+-activated Ba2LiB5O10 phosphors

Abstract: A novel orange-yellow-emitting Ba2LiB5O10:Eu2+ phosphor has been synthesized by traditional high temperature solid state reaction. A monoclinic crystal structure of Barium lithiumborates Ba2LiB5O10 was verified by the investigation of X-ray diffraction (XRD). The compound crystallizes in the space group of P121/m1(11) (Z=2) with the unit cell parameters a=4.414(1)Å, b=14.576(2)Å, c=6.697(2)Å and β=104.26(2)°. Barium and lithium atoms are located in distorted octahedral and tetrahedral oxygen coordinations, respectively. Upon around 365nm excitation, the Eu2+-activated Ba2LiB5O10 phosphors exhibit a single broad emission band with the maximum at about 587nm, due to the 4f65d→4f7(8S7/2) transition of Eu2+. This work investigates the relationship between luminescence properties and structural characterization of the Ba2LiB5O10: Eu2+. This newly developed phosphor shows high potential as a phosphor conversion for white LED applications. [Copyright &y& Elsevier]