摘要
用传统的高温固相法及近几年兴起的温和水热法合成了KMgF3 ∶Eu多晶粉末 ,同时用Bridgman Stockbarger法生长了KMgF3 ∶Eu单晶体。对三种方法合成的样品进行比较发现 :水热和单晶样品中 ,除了Eu2 + 的f→f锐线发射外 ,还观察到了 4 2 0nm处的宽带发射 ;这些发射带主要应归属于晶体中存在的色心和氧中心。而且与高温样品相比 ,Eu2 + 在 36 0nm处的线发射强度明显减小 ,原因是发生了Eu2 +
KMgF 3 which was typical cubic perovskite structure, was ideal material for searching for new solid state laser because of its several advantages: good homogenous optics, high thermal stability, low melting point, anisotropy and high optical transparency etc. Due to the broad forbidden band and weak crystal field intensity, KMgF 3 could stabilize low valence rare earth ions, which could be used to further study refine spectra structure of these rare earth ions. Using a traditional high temperature solid state reaction, mild hydrothermal and bridgman stockbarger method, the KMgF 3∶Eu 2+ samples was synthesized. In the hydrothermal and single crystal samples, the 420nm emission peak besides the emission of Eu 2+ at 359 5nm was observed. After the sample was annealed, the emission intensity at 420nm lowered about 30 times than that before annealing, but there still was the weak emission peak at 420nm. We drew a conclusion that the 420nm emission peak resulted from main color center and trace oxygen center. Combining the intensity change of the Eu 2+ emission at 359 5nm in KMgF 3∶Eu 2+ sample annealed before and after, we proved that the energy transfer from Eu 2+ to color centers occurred. In addition, the relative oxygen content in crystal was calculated by means of the absorption spectra data.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2002年第3期243-246,共4页
Chinese Journal of Luminescence
基金
国家重点基础研究发展规划资助项目 (G19980 613 0 6)
国家自然科学基金资助项目 (5 0 0 72 0 3 1)
