Photoluminescence Properties of Double Perovskite Tantalates Activated with Mn4+, AE2LaTaO6:Mn4+ (AE = Ca, Sr, and Ba)

被引：39

作者：

Takeda, Yohei ^{[1
]}

Kato, Hideki ^{[1
]}

Kobayashi, Makoto ^{[1
]}

Nozawa, Shunsuke ^{[2
]}

Kobayashi, Hisayoshi ^{[3
]}

Kakihana, Masato ^{[1
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[2] High Energy Accelerator Res Org, Inst Mat Struct Sci, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

[3] Kyoto Inst Technol, Grad Sch Sci & Technol, Dept Chem & Mat Technol, Sakyo Ku, Kyoto 6068585, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 34期

关键词：

RED-EMITTING PHOSPHOR; LUMINESCENCE PROPERTIES; CONVERSION PHOSPHORS; LIGHT; EMISSION; SUBSTITUTION; STRATEGY; LEDS;

D O I：

10.1021/acs.jpcc.7b06280

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Tetravalent manganese is known as one of the candidate luminous centers to obtain red emission. There are still unclear factors in Mn4+-activated oxide phosphors to achieve intense emission. In this paper, we studied the photoluminescence properties of double perovskite-type tantalates AE(2)LaTaO(6) (AE = Ca, Sr, and Ba) activated with Mn4+. All AE(2)LaTaO(6):Mn exhibited Mn4+-emission in the deep red region under excitation by near ultraviolet-green light (300-570 nm) at room temperature. Co-substitution of Mg2+, Al3+, and Ti4+ compensates unbalanced charge caused by oxygen defects, resulting in the enhancement of Mn4(+-)emission. The present cosubstitution effect is different from the usual cosubstitution, such as the replacement of two Al3+ by Mn4+ and Mg2+, taking into consideration the charge balance between cations. Theoretical calculation of band structures based on density functional theory suggests the presence of two kinds of quenching schemes in AE(2)LaTaO(6):Mn, photoionization and electron transfer from valence band to t(2g) orbitals of Mn.

引用

页码：18837 / 18844

页数：8

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