@article{0d46a2d907e34c8994739b1d2ca5134b,
title = "Atomic structure of luminescent centers in high-efficiency Ce-doped w-AlN single crystal",
abstract = "Rare-earth doped wurtzite-type aluminum nitride (w-AlN) has great potential for high-efficiency electroluminescent applications over a wide wavelength range. However, because of their large atomic size, it has been difficult to stably dope individual rare-earth atoms into the w-AlN host lattice. Here we use a reactive flux method under high pressure and high temperature to obtain cerium (Ce) doped w-AlN single crystals with pink-colored luminescence. In order to elucidate the atomic structure of the luminescent centers, we directly observe individual Ce dopants in w-AlN using annular dark-field scanning transmission electron microscopy. We find that Ce is incorporated as single, isolated atoms inside the w-AlN lattice occupying Al substitutional sites. This new synthesis method represents a new alternative strategy for doping size-mismatched functional atoms into wide band-gap materials.",
author = "Ryo Ishikawa and Lupini, {Andrew R.} and Fumiyasu Oba and Findlay, {Scott D.} and Naoya Shibata and Takashi Taniguchi and Kenji Watanabe and Hiroyuki Hayashi and Toshifumi Sakai and Isao Tanaka and Yuichi Ikuhara and Pennycook, {Stephen J.}",
note = "Funding Information: This research was supported by a Grant-in-Aid for Scientific Research on Innovative Areas, {\textquoteleft}{\textquoteleft}Nano Informatics{\textquoteright}{\textquoteright} (Grant Nos. 25106003, 25106005, and 25106006) from JSPS, and {\textquoteleft}{\textquoteleft}Funding Program for World-Leading Innovation R&D on Science and Technology (FIRST Program).{\textquoteright}{\textquoteright} A part of this research was conducted in {\textquoteleft}{\textquoteleft}Research Hub for Advanced Nano Characterization, The University of Tokyo,{\textquoteright}{\textquoteright} supported under {\textquoteleft}{\textquoteleft}Nanotechnology Platform{\textquoteright}{\textquoteright} (Project No. 12024046) by MEXT, Japan. R.I. acknowledges support from JSPS Postdoctoral Fellowship for Research Abroad. A.R.L. and S.J.P. acknowledge support by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division. F.O. acknowledges support from MEXT Elements Strategy Initiative to Form Core Research Center. S.D.F acknowledges support under the Discovery Projects funding scheme of the Australian Research Council (Projects No DP110101570). N.S. acknowledges support from JSPS KAKENHI (Grant No. 23686093). The XANES measurements were carried out under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2007G194). Computing resources of ACCMS at Kyoto University were used for the first-principles calculations.",
year = "2014",
month = jan,
day = "21",
doi = "10.1038/srep03778",
language = "English",
volume = "4",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
}