稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
10期
946-951
,共6页
林啸%冯昂%张志军%赵景泰
林嘯%馮昂%張誌軍%趙景泰
림소%풍앙%장지군%조경태
rare-earth%phosphates%optical materials%luminescence%VUV spectra
This study fully investigated the vacuum ultraviolet excitation spectra of pure and rare-earth (RE=Eu, Tb and Dy)-doped A2Zr(PO4)2 (A=Li, Na and K) phosphors. The synthesized Na and Li compounds were characterized by XRD showing two new types of phases after indexation. Although these three pure compounds had different crystal structures, they exhibited similar luminescence properties. For Eu3+-activated samples, the broad excitation band centered at 217 nm could be attributed to the CT transition between O2- (2p6) and Eu3+ ions. For Tb3+-doped samples, two groups of f-d transitions were observed, where a strong broad band at 221 nm was due to the spin-allowed f-d transition. Energy transfer from O2-to Dy3+was not observed in Dy3+-doped phosphors, probably because it overlapped considerably with the CT transition from O2- to Zr4+at 187 nm.
