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题名: Synthesis and luminescence properties of highly uniform spherical SiO2@SrSi2O2N2:Eu2+ core-shell structured phosphors
作者: Tang, Jia-Ye1;  Yang, Xiu-Fang1;  Zhan, Cheng1;  Hao, Lu-Yuan1;  Xu, Xin1;  Zhang, Wen-Hua2
刊名: JOURNAL OF MATERIALS CHEMISTRY
发表日期: 2012-01-14
DOI: 10.1039/c1jm12958a
卷: 22, 期:2, 页:488-494
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: The novel SiO2@SrSi2O2N2:Eu2+ core-shell structured oxynitride phosphors were synthesized by an interfacial reaction mechanism for the first time. First, SrCO3:Eu3+ layers were deposited on monodispersed and spherical SiO2 templates through the urea homogeneous precipitation methods to fabricate the SiO2@SrCO3:Eu3+ precursor particles; then the precursor particles were coated with H3BO3, which will be transformed to a protective h-BN film to prevent the agglomeration of the SiO2 templates at high temperature; at last, the SiO2@SrSi2O2N2:Eu2+ core-shell structured phosphors were synthesized through a gas reduction and nitridation method at 1350 degrees C under a NH3 gas flow. A uniform dense shell composed of nano-sized (similar to 20 nm) SrSi2O2N2:Eu2+ grains tightly adhered to the surface of the SiO2 cores. X-Ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), high resolution transition electron microscopy (HR-TEM) as well as photoluminescence (PL) spectra were used to characterize the samples. The results indicate that the obtained submicron SiO2@SrSi2O2N2:Eu2+ phosphors consist of the outer h-BN film, the middle SrSi2O2N2:Eu2+ shell, and amorphous SiO2 cores and exhibit narrow particle size distribution, perfectly spherical morphology and non-aggregation. Under the excitation of UV and blue light, the phosphors show strong green emission due to the 4r(6)d-4f(7) transition of Eu2+. This study opens new possibilities to facilely synthesize highly stable spherical (oxo)nitridosilicate phosphors with monodispersity and improved luminescence properties for display and lighting devices.
关键词[WOS]: SOL-GEL PROCESS ;  HEXAGONAL BORON-NITRIDE ;  LIGHT-EMITTING-DIODES ;  PHOTOLUMINESCENCE PROPERTIES ;  OPTICAL-PROPERTIES ;  ENERGY-TRANSFER ;  SILICA SPHERES ;  RED PHOSPHOR ;  WHITE LEDS ;  PARTICLES
语种: 英语
WOS记录号: WOS:000299020000031
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143006
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Univ Sci & Technol China, Chinese Acad Sci Key Lab Mat Energy Convers, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian, Peoples R China

Recommended Citation:
Tang, Jia-Ye,Yang, Xiu-Fang,Zhan, Cheng,et al. Synthesis and luminescence properties of highly uniform spherical SiO2@SrSi2O2N2:Eu2+ core-shell structured phosphors[J]. JOURNAL OF MATERIALS CHEMISTRY,2012,22(2):488-494.
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