CaTiO3:Eu3+ layers coated SiO2 particles: Core-shell structured red phosphors for near-UV white LEDs

被引：30

作者：

Sun, Wenting ^{[2
]}

Gu, Yunxin ^{[2
]}

Zhang, Qinghong ^{[2
]}

Li, Yaogang ^{[1
]}

Wang, Hongzhi ^{[2
]}

机构：

[1] Donghua Univ, Coll Mat Sci & Engn, Engn Res Ctr Adv Glasses Mfg Technol, Shanghai 201620, Peoples R China

[2] Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 493卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Phosphors; Optical properties; Luminescence; Sol-gel processes; LUMINESCENCE PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; SILICA SPHERES; SR; CA; BA;

D O I：

10.1016/j.jallcom.2009.12.155

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：

CaTiO3:Eu3+ layers were coated on non-aggregated, monodisperse and spherical SiO2 particles through sol-gel process which used citric acid as the chelating agent, resulting in the formation of SiO2-CaTiO3:Eu3+ core-shell structured phosphors. The results of X-ray diffraction, scanning electron microscopy and transmission electron microscopy demonstrate that the CaTiO3:Eu3+ phosphor layers were successfully coated on the SiO2 surfaces. The SiO2 template imprinted its morphology to the CaTiO3:Eu3+ layers and decreased the size of these luminescent crystalline grains. It can be observed that these core-shell phosphors exhibit strong red emission dominated by D-5(0) to F-7(2) transition of Eu3+ ions at 616 nm under near-UV excitation (400 nm), and the photoluminescence (PL) intensity can be tuned by the coating number. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：561 / 564

页数：4

共 25 条

[1] Performance Changes of Surface Coated Red Phosphors with Silica Nanoparticles and Silica Nanocomposites [J].