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为了考察杂质阴离子对Eu2 + 光谱的影响 ,应用光谱方法研究了复合氟化物中氧离子对氟离子的取代与Eu2 + 光谱变化的关系 结果表明 :在KCaF3和BaY2 F8基质中 ,氧的存在产生了Eu2 + 新的发光中心 ,其中一种为正常的Eu2 + 的发射中心 ,即Eu2 + (F- )中心 ,另一种为氧离子对氟离子取代形成的发射中心 ,即Eu2 + (O2 - )中心 ;对于KCaF3基质 ,随还原气氛中H2 含量的增加 ,Eu2 + (O2 - )发射中心强度逐渐降低 ;对于BaY2 F8基质 ,随还原气氛中H2 含量的增加 ,Eu2 + (O2 - )发射中心的激发和发射能量向高能方向移动 由于氧在氟化物基质中结合的牢固 ,即使在完全H2气氛中还原 ,Eu2 + (O2 - )新的发光中心也不能完全消除
In order to investigate the effect of impurity anions on the Eu2 + spectrum, the relationship between fluoride ion substitution and Eu2 + spectra in complex fluoride was studied by spectroscopy. The results show that the presence of oxygen in KCaF3 and BaY2 F8 matrices Eu2 + new luminescent centers, one of them is the emission center of Eu2 + (F-), the other one is the emission center formed by substitution of fluoride ions by fluoride ion, that is Eu2 + (O2-) For the KCaF3 matrix, the emission center intensity of Eu2 + (O2 -) gradually decreases with the increase of H2 content in the reducing atmosphere. For the BaY2 F8 matrix, with the increase of H2 content in the reducing atmosphere, the Eu2 + Excitation and emission energies move in the direction of higher energies Due to the strong binding of oxygen in the fluoride matrix, new luminescent centers of Eu2 + (O2 -) can not be completely eliminated even if reduced in a complete H2 atmosphere