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Issue 24, 2018
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Red-emission over a wide range of wavelengths at various temperatures from tetragonal BaCN2:Eu2+

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Abstract

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.

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

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Publication details

The article was received on 16 Mar 2018, accepted on 24 Apr 2018 and first published on 25 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC01289J
Citation: J. Mater. Chem. C, 2018,6, 6370-6377
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    Red-emission over a wide range of wavelengths at various temperatures from tetragonal BaCN2:Eu2+

    Y. Masubuchi, S. Nishitani, A. Hosono, Y. Kitagawa, J. Ueda, S. Tanabe, H. Yamane, M. Higuchi and S. Kikkawa, J. Mater. Chem. C, 2018, 6, 6370
    DOI: 10.1039/C8TC01289J

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