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CHEN WEI, SONG JIAQING, and SU MIANCENG, 151Eu-MOSSBAUER SPECTRA AND XPS INVESTIGATION OF BaFBr: Eu PHOSPHOR, J. Univ. Sci. Technol. Beijing , 2(1995), No. 2, pp.97-103.
CHEN WEI, SONG JIAQING, and SU MIANCENG, 151Eu-MOSSBAUER SPECTRA AND XPS INVESTIGATION OF BaFBr: Eu PHOSPHOR, J. Univ. Sci. Technol. Beijing , 2(1995), No. 2, pp.97-103.
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BaFBr：Eu发光材料的151Eu穆斯堡尔谱及X射线光电子能谱研究

摘要: 首次报道了BaFBr：Eu发光材料的151Eu穆斯堡尔谱。结果表明fEu2+<f（Eu3+），即<X2>Eu2+><x2>Eu3+，说明声子与Eu2+的作用比声子对Eu3+的作用大。实验结果也证明当温度降低时，f（Eu2+）的增长比f（Eu3+）的增长快，并且发现当温度降低时，Eu2+的相对含量减少，而Eu3+的含量增加.变温实验提供的证据表明Eu2+与Eu3+之间有电子的"跳动"。穆斯堡尔谱的实验结果还与XPS及发光的结果进行了对比和讨论。

 

151Eu-MOSSBAUER SPECTRA AND XPS INVESTIGATION OF BaFBr: Eu PHOSPHOR

Abstract: 151Eu Mossbauer spectra of BaFBr:Eu phosphor are reported for the first time.The results show that f(Eu2+)<f(Eu3+) or <x2>Fu2+><x2>Fu3+,which indicates that the attraction between phonons and Eu2+ is stronger than that between phonons and Eu3+,this may cause a faster increase of f(Eu2+) vs f(Eu3+) when temperature decreases as observed in the experiments.It is also found from Mossbauer investigation that when temperature decreases,the relative content of Eu2+ decreases, while that of Eu3+ increases.The temperature dependent Mossbauer spectra provide evidence for electron exchange or hopping between Eu2+ or Eu3+ sites in BaFBr lattice. The Mossbauer results are discussed and compared with the results of XPS and Photoluminescence studies.

 

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