Synthesis, Structure, and Luminescence Properties of K2Ba7Si16O40:Eu2+ for White Light Emitting Diodes

被引：64

作者：

Lv, Wenzhen ^{[1
,2
]}

Jia, Yongchao ^{[1
,2
]}

Zhao, Qi ^{[1
]}

Lu, Wei ^{[1
]}

Jiao, Mengmeng ^{[1
,2
]}

Shao, Baiqi ^{[1
,2
]}

You, Hongpeng ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 09期

基金：

中国国家自然科学基金;

关键词：

PHOSPHOR; ENERGY; CA; PHOTOLUMINESCENCE; OXYFLUORIDE; EFFICIENT; EDGE; BA;

D O I：

10.1021/jp500662a

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：

In this paper, a novel divalent europium-doped green emitting blue convertible K2Ba7Si16O40:Eu2+ phosphor has been synthesized successfully via high-temperature solid-state reaction. The structure of K2Ba7Si16O40:Eu2+ has been refined on the basis of X-ray powder diffraction by Rietveld refinement method, which consists of two infinite dimensional layers of corner-sharing [SiO4] tetrahedral parallel to (201) linked together through eight-coordinate K and seven- and nine-coordinate Ba atoms. Under excitation of blue light, the K2Ba7Si16O40:Eu2+ phosphor emits a strong green emission band peaking at 500 nm. The concentration quenching mechanism of the Eu2+ ion was discussed and the critical distance was calculated. Furthermore, the phosphor exhibits high quantum efficiency and good thermal stability, indicating that the K2Ba7Si16O40:Eu2+ phosphor can serve as an effective green emitting candidate for blue light down-conversion white light emitting diodes.

引用

页码：4649 / 4655

页数：7

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