5d Levels of rare-earth ions in oxynitride/nitride phosphors: To what extent is the idea covalency reliable?

被引：38

作者：

Mikami, Masayoshi ^{[1
]}

Kijima, Naoto ^{[1
]}

机构：

[1] Mitsubishi Chem Grp Sci & Technol Res Ctr Inc, Aoba Ku, Yokohama, Kanagawa 2278502, Japan

来源：

OPTICAL MATERIALS | 2010年 / 33卷 / 02期

关键词：

White LED; Phosphor; Covalency; Polarizability; Dielectric constant; INORGANIC-COMPOUNDS; LUMINESCENCE; TRANSITION; EU2+;

D O I：

10.1016/j.optmat.2010.07.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It is often said that promising phosphors for white-LEDs are Ce3+/Eu2+-doped multinary oxynitrides/nitrides, mainly because they are more covalent than conventional oxide phosphors so as to be effectively excited by blue or near-ultra-violet light. In this paper, detailed discussions are given to clarify factors affecting 5d levels of the rare-earth ions in nitride/oxynitride phosphors by examining some examples: LaSi3N5:Ce (blue phosphor)/La3Si6N11:Ce (yellow phosphor) and BaSi2O2N2:Eu (bluish green phosphor)/Ba3Si6O9N4:Eu (bluish green phosphor)/Ba3Si6O12N2:Eu (green phosphor). It is stressed that dielectric constant/refractive index (as an indicator of polarizability of ligand) along with coordinate bond length should be examined rather than covalency to grasp the trend of 4f-5d transitions. For this purpose, some useful rules-of-thumb are addressed. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：145 / 148

页数：4

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