Persistent spectral hole burning of rare-earth ions doped in sol-gel glasses

摘要

Abstract: We demonstrate a sol-gel method for preparing Eu$+3$PLU$/ and Sm$+2$PLU$/ ions-doped glasses exhibiting persistent spectral hole burning at high temperature. Glasses having the composition of Eu$+3$PLU$/ or Sm$+2$PLU$/-doped Al$- 2$/O$-3$/-SiO$-2$/ have been prepared by the hydrolysis of metal alkoxides and heating at 800$DGR@C in air or hydrogen gas atmosphere, respectively. The persistent spectral hole burning is measured within the $+7$/F$-0$/-$+5$/D$-0$/ transition band. For the glasses containing OH bonds, the hole is formed by the photoinduced rearrangement of the OH bonds surrounding the Eu$+3$PLU$/ or Sm$+2$PLU$/ ions, and is thermally refilled and erased above approximately 200 K. On the other hand, the glasses heated in hydrogen gas show the hole spectra above approximately 200 K. The hole depth is independent of the temperature and is approximately 7 and 15% of the total intensity at room temperature for the Eu$+3$PLU$/ and Sm$+2$PLU$/ ions-doped glasses, respectively. The proposed mechanism is the electron transfer between the rare-earth ions and the defect centers related with Al$+3$PLU$/ ions in glass network.!12