Structural evolution induced preferential occupancy of designated cation sites by Eu2+ in M5(Si3O9)2 (M = Sr, Ba, Y, Mn) phosphors

Yi. Wei; Chun Che Lin; Zewei Quan; Maxim S. Molokeev; Victor V. Atuchin; Ting-Shan Chan; Yujun Liang; Jun Lin; Guogang Li

doi:10.1039/C6RA11681G

Structural evolution induced preferential occupancy of designated cation sites by Eu²⁺ in M₅(Si₃O₉)₂ (M = Sr, Ba, Y, Mn) phosphors†

Yi. Wei,‡^a Chun Che Lin,‡*^c Zewei Quan,^d Maxim S. Molokeev,

^ef Victor V. Atuchin,^ghi Ting-Shan Chan,^j Yujun Liang,^a Jun Lin*^b and Guogang Li*^a

Author affiliations

* Corresponding authors

^a Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China
E-mail: ggli8312@gmail.com

^b State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: jlin@ciac.ac.cn

^c Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
E-mail: cclin0530@gmail.com

^d Department of Chemistry, South University of Science and Technology of China, Shenzhen, Guangdong 518055, P. R. China

^e Laboratory of Crystal Physics, Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia

^f Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia

^g Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia

^h Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia

ⁱ Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, 2 Pirogov Str., Novosibirsk 630090, Russia

^j National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan

Abstract

In this paper, we present new insight into a changing Eu²⁺ crystallographic site preference in Eu-doped M₅(Si₃O₉)₂ (M = Sr, Ba, Y, Mn), which is related to the structural variation induced by M cation substitutions. The effect of the local structural geometry on the luminescence properties of Eu²⁺ is revealed. By substitution of Ba²⁺ for Sr²⁺, the lattice expansion is restricted to specific cation sites, resulting in the abrupt blue shifted emission of Eu²⁺ ions. The abnormal blue shift on replacing Sr²⁺ with Mn²⁺ is attributed to the preferential 6-fold coordination for Mn²⁺ that moves the Eu²⁺ ions to other sites. The results elucidate the mechanisms of emission band adjustment by local site coordination change and it can be potentially extended to crystals which properties are sensitive to local lattice variations.

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Structural evolution induced preferential occupancy of designated cation sites by Eu²⁺ in M₅(Si₃O₉)₂ (M = Sr, Ba, Y, Mn) phosphors†

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Structural evolution induced preferential occupancy of designated cation sites by Eu²⁺ in M₅(Si₃O₉)₂ (M = Sr, Ba, Y, Mn) phosphors

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