Quantitative luminescence switching in CePO4:Tb by redox reactions

Mami Kitsuda, Shinobu Fujihara

研究成果: Article査読

57 被引用数 (Scopus)

抄録

Luminescence-switching behaviors of CePO4:Tb3+ upon redox reactions were examined using KMnO4 and l(+)-ascorbic acid as an oxidant and a reductant, respectively. Powdery nanorod-like CePO 4:Tb3+ particles were synthesized by liquid-phase reactions of rare-earth ions and phosphate ions in aqueous solutions at low temperatures. According to X-ray diffractometry, X-ray photoelectron spectroscopy, and transmission electron microscopy, the oxidizing treatment of CePO4:Tb3+ was found to bring about partial oxidation of Ce3+ to Ce4+ and a small degree of structural damage in the particle surface, which could be recovered by the subsequent reducing treatment. Photoluminescence (PL) intensity of CePO4:Tb3+ due to 5D47FJ (J = 3-6) electronic transitions of Tb3+ was decreased with increasing KMnO4 concentration in an exponential manner, resulting from excitation cutoff by an intervalence Ce3+ → Ce4+ charge transfer and emission cutoff by a Ce3+ absorption red-shifted to the visible region. Reversely, PL intensity was increased also in the exponential manner by increasing the l(+)-ascorbic acid concentration in reducing the previously oxidized CePO4:Tb3+, thereby achieving the quantitative, repetitive luminescence switching. Our results demonstrate that the luminescence switching is regarded as a surface phenomenon without a whole change of structure and valence in the CePO4:Tb 3+ material.

本文言語English
ページ(範囲)8808-8815
ページ数8
ジャーナルJournal of Physical Chemistry C
115
17
DOI
出版ステータスPublished - 2011 5月 5

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー一般
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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