Ce 4+ -Based Compounds Capable of Photoluminescence by Charge Transfer Excitation under Near-Ultraviolet-Visible Light

Dawei Wen, Hideki Kato, Makoto Kobayashi, Shunsuke Yamamoto, Masaya Mitsuishi, Kotaro Fujii, Masatomo Yashima, Masato Kakihana

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Ce 4+ -based charge transfer phosphor is not common and has been reported mainly in Sr 2 CeO 4 with an excitation band peaking at ∼290 nm, mismatching with the near-ultraviolet light emitting diodes. Herein, we report a new series of Ce 4+ -based compounds Sr 4.4 Ce 2.6 REZnO 12 (RE = Y, La, and Eu) capable of photoluminescence induced by O 2- -Ce 4+ charge transfer excitation under near-ultraviolet-visible light. The crystal structure of Sr 4.4 Ce 2.6 EuZnO 12 was determined by single crystal X-ray diffraction. The RE = La and Y samples were confirmed to be iso-structure compounds of the RE = Eu sample by powder X-ray diffraction. By introducing highly covalent Zn 2+ -O 2- bonds into the framework, the Ce 4+ -O 2- bonds are lengthened due to the effect of the Ce 4+ -O 2- -Zn 2+ stretch. The lengthened Ce 4+ -O 2- bond weakens the repulsion of the electrons between Ce 4+ and O 2- , thereby lowering the charge transfer energy to the visible light region. Incorporation of Eu 3+ into the present compounds realized red emission under near-ultraviolet-visible excitation by the O 2- -Ce 4+ charge transfer followed by energy transfer to Eu 3+ .

Original languageEnglish
Pages (from-to)14524-14531
Number of pages8
JournalInorganic chemistry
Volume57
Issue number23
DOIs
Publication statusPublished - 2018 Dec 3

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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