화학공학소재연구정보센터
Materials Research Bulletin, Vol.111, 140-145, 2019
Intense red emission and two-way energy transfer in Sm3+, Eu3+ co-doped NaLa(WO4)(2) phosphors
NaLa(WO4)(2) phosphors with various Eu3+ and Sm3+ concentrations were prepared via a molten salt method. The structure and luminescent properties of the prepared samples were analyzed by the X-ray diffraction (XRD) and fluorescence spectrophotometer. The results show that the crystal phase of all the prepared samples is single tetragonal crystal structure. The energy transfer type between Eu3+ ions is proved to be the exchange interaction and the electron-phonon coupling is weak. With the increase of the Sm3+ concentration, the energy transfer from Sm3+ to Eu3+ in NaLa(WO4)(2):0.15Eu(3+),xSm(3+) is transformed from Eu3+ to Sm3+, and the mechanism for energy transfer is given.