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Red-emission over a wide range of wavelengths at various temperatures from tetragonal BaCN2:Eu2+
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) |
URI: | http://hdl.handle.net/2115/74809 |
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)
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Submitter: 鱒渕 友治
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