Sr[BeSi2N4]:Eu2+/Ce3+ and Eu[BeSi2N4]: Nontypical Luminescence in Highly Condensed Nitridoberyllosilicates

被引：23

作者：

Strobel, Philipp ^{[1
]}

Weiler, Volker ^{[2
]}

Schmidt, Peter J. ^{[2
]}

Schnick, Wolfgang ^{[1
]}

机构：

[1] Univ Munich LMU, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany

[2] Lumileds Germany GmbH, LPCA, Philipsstr 8, D-52068 Aachen, Germany

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2018年 / 24卷 / 28期

关键词：

beryllates; luminescence; nitrides; nitridosilicates; solid-state structures; CRYSTAL-STRUCTURE; BAND; PHOSPHOR; NITRIDE; NITRIDOSILICATE; EU2+;

D O I：

10.1002/chem.201800912

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

M[BeSi2N4] (M=Sr,Eu), crystallizing in the hexagonal space group P (6) over bar 2c, was synthesized from Sr(NH2)(2), Be3N2, and "Si(NH)(2)" in W crucibles under a N-2 atmosphere in a radio-frequency furnace. The crystal structure was solved from powder X-ray diffraction data by the charge-flipping method (Sr[BeSi2N4]: a=4.86082(2), c=9.42264(4)angstrom, Z=2; Eu[BeSi2N4]: a=4.85848(1), c=9.41615(4)angstrom). M[BeSi2N4] contains a highly condensed rigid network of trigonal planar [BeN3] units that are connected to Si2N7 double tetrahedra by common vertices. M[BeSi2N4] (M=Sr,Eu) are the first examples of nitridoberyllosilicates and are isotypic to the oxoberyllate Sr[Be3O4]. Eu2+-doped Sr[BeSi2N4] and Eu[BeSi2N4] show orange-trapped exciton emission (lambda(em)=605nm, fwhm approximate to 126nm), whereas Ce3+-doped samples of Sr[BeSi2N4] show nontypical yellowish-orange luminescence. Sr[BeSi2N4] has a large band gap of approximate to 4.4eV and shows high chemical and thermal stability. Eu2+-doped beryllates with regular 4f(6)5d(1)4f(7)-emission could be interesting for future application in LEDs upon doping with Eu2+ or Ce3+ due to large band gaps, rigid networks, and chemical and thermal stability.

引用

页码：7243 / 7249

页数：7

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