Red-emission over a wide range of wavelengths at various temperatures from tetragonal BaCN2:Eu2+

Yuji Masubuchi, Sayaka Nishitani, Akira Hosono, Yuuki Kitagawa, Jumpei Ueda, Setsuhisa Tanabe, Hisanori Yamane, Mikio Higuchi, Shinichi Kikkawa

    研究成果: Article査読

    14 被引用数 (Scopus)

    抄録

    A new polymorph of BaCN2 was obtained via a simple nitridation reaction of BaCO3 under an NH3 flow at 900 °C. The product was analyzed via single crystal X-ray diffraction and infrared spectroscopy, and it was found to have a tetragonal I4/mcm crystal structure (space group no. 140) with a = 0.60249(4) nm and c = 0.71924(5) nm. In this structure, each Ba2+ cation is situated in the square antiprism of N atoms of NCN2- anionic groups. Eu2+ doped BaCN2 can be excited by irradiation of blue and green light (from 400 to 550 nm), and it generates an intense red emission peak at 660 nm with a quantum efficiency of 42% in response to 465 nm excitation at room temperature. The peak emission wavelength varies over an extremely wide range of temperature, from 640 nm at 500 K to 680 nm at 80 K, and this red-shift with decreasing temperature is attributed to a unit cell shrinkage that results in significant crystal field splitting of the 5d energy levels of the Eu2+ ions.

    本文言語English
    ページ(範囲)6370-6377
    ページ数8
    ジャーナルJournal of Materials Chemistry C
    6
    24
    DOI
    出版ステータスPublished - 2018

    ASJC Scopus subject areas

    • 化学 (全般)
    • 材料化学

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