γ-辐照对纯Y2SiO5和Eu^3＋：Y2SiO5晶体光谱性能的影响

研究了γ-辐照前后纯Y2SiO5和Eu^3＋掺杂的Y2SiO5晶体吸收光谱的变化，辐照后，未退火和氢气退火的纯Y2SiO5晶体在260-270nm和320nm波段产生了附加吸收峰，分别是由F心和O^-心的吸收引起的；经过空气退火的纯YSO晶体中，由于消除了氧空位，因此辐照后没有出现色心吸收峰。在Eu^3＋；Y2SiO5晶体中，不但有相同的F心和O心吸收峰，而且还有Eu^2＋离子在300nm和390nm的吸收峰。随着辐照剂量的增加，色心附加吸收峰增强。空气退火能减少Eu^3＋：Y2SiO5晶体中的色心，而氢

The absorption spectra of undoped and Eu3+-doped Y2SiO5 single crystals before and after gamma irradiation were studied. Additional absorption peaks at 260～270 nm and 320 nm were observed in irradiated Y2SiO5 crystal with no annealing or hydrogen-annealing, which were respectively caused by F centers and O- centers. Owing to the abserence of oxygen vacancy, there was no absorption peaks of color centers in air-annealed Y2SiO5 crystal. Additional absorption band of Eu2+ ions, which peaked at 300 nm and 390 nm, were produced in irradiated and H2-annealed Eu3+∶Y2SiO5 crystal, except absorption bands of F centers and O- centers. Additional absorption increased with irradiation dose increasing. Air-annealing could decrease the concentration of color centers, and the H2-annealing could increase it.