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

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Title: Red-emission over a wide range of wavelengths at various temperatures from tetragonal BaCN2:Eu2+
Authors: Masubuchi, Yuji Browse this author →KAKEN DB
Nishitani, Sayaka Browse this author
Hosono, Akira Browse this author
Kitagawa, Yuuki Browse this author
Ueda, Jumpei Browse this author
Tanabe, Setsuhisa Browse this author
Yamane, Hisanori Browse this author
Higuchi, Mikio Browse this author
Kikkawa, Shinichi Browse this author
Issue Date: 28-Jun-2018
Publisher: Royal Society of Chemistry
Journal Title: Journal of materials chemistry C
Volume: 6
Issue: 24
Start Page: 6370
End Page: 6377
Publisher DOI: 10.1039/c8tc01289j
Abstract: A new polymorph of BaCN2 was obtained via a simple nitridation reaction of BaCO3 under an NH3 flow at 900 1C. 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 NCN(2-)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.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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