Eu2+-activated Ca8 Zn (SiO4) 4Cl2: An intense green emitting phosphor for blue light emitting diodes

Wei Lü; Zhendong Hao; Xia Zhang; Yongfu Liu; Yongshi Luo; Xingyuan Liu; Xiaojun Wang; Jiahua Zhang

doi:10.1149/1.3518763

Eu²⁺-activated Ca₈ Zn (SiO₄) ₄Cl₂: An intense green emitting phosphor for blue light emitting diodes

Wei Lü, Zhendong Hao, Xia Zhang, Yongfu Liu, Yongshi Luo, Xingyuan Liu, Xiaojun Wang, Jiahua Zhang

Biochemistry, Chemistry & Physics

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

We report intense green luminescence upon blue light excitation in Eu ²⁺-activated Ca₈ Zn (SiO₄)₄Cl ₂ prepared by high temperature solid state reaction with nominal composition of (2-x) CaO-xZnO-SiO₂-CaCl₂ (0≤x≤1.1). It is observed that the material phase gradually converts from Ca₃ SiO₄ Cl₂: Eu²⁺ to Ca₈ Zn (SiO ₄)₄ Cl₂: Eu²⁺ followed by improved luminescent properties with increasing x. The two phosphors both emit with a maximum at 505 nm. Significantly, Ca₈ Zn (SiO₄) ₄ Cl₂: Eu²⁺ shows a more intense excitation band in the blue centered at 450 nm. Upon 450 nm excitation, the integrated emission intensity of Ca₈ Zn (SiO₄)₄ Cl ₂: Eu²⁺ is 1.3 times stronger Ca₈ Mg (SiO ₄)₄ Cl₂: Eu²⁺ and nearly the same as Ca₃ Sc₂ Si₃ O₁₂: Ce³⁺ phosphors. Attempts to understand the origins of the intense luminescence are presented on the basis of diffuse reflection spectra and fluorescence decays of Ca₈ Zn (SiO₄)₄ Cl₂: Eu²⁺ in comparison with related phosphors. The present results suggest that Ca ₈ Zn (SiO₄)₄ Cl₂: Eu²⁺ could be a promising green emitting phosphor for excitation by blue light emitting diodes.

Original language	English
Pages (from-to)	H124-H127
Journal	Journal of the Electrochemical Society
Volume	158
Issue number	2
DOIs	https://doi.org/10.1149/1.3518763
State	Published - 2011

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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10.1149/1.3518763

Cite this

@article{887b7ad6248b46acae82c49bc3543825,

title = "Eu2+-activated Ca8 Zn (SiO4) 4Cl2: An intense green emitting phosphor for blue light emitting diodes",

abstract = "We report intense green luminescence upon blue light excitation in Eu 2+-activated Ca8 Zn (SiO4)4Cl 2 prepared by high temperature solid state reaction with nominal composition of (2-x) CaO-xZnO-SiO2-CaCl2 (0≤x≤1.1). It is observed that the material phase gradually converts from Ca3 SiO4 Cl2: Eu2+ to Ca8 Zn (SiO 4)4 Cl2: Eu2+ followed by improved luminescent properties with increasing x. The two phosphors both emit with a maximum at 505 nm. Significantly, Ca8 Zn (SiO4) 4 Cl2: Eu2+ shows a more intense excitation band in the blue centered at 450 nm. Upon 450 nm excitation, the integrated emission intensity of Ca8 Zn (SiO4)4 Cl 2: Eu2+ is 1.3 times stronger Ca8 Mg (SiO 4)4 Cl2: Eu2+ and nearly the same as Ca3 Sc2 Si3 O12: Ce3+ phosphors. Attempts to understand the origins of the intense luminescence are presented on the basis of diffuse reflection spectra and fluorescence decays of Ca8 Zn (SiO4)4 Cl2: Eu2+ in comparison with related phosphors. The present results suggest that Ca 8 Zn (SiO4)4 Cl2: Eu2+ could be a promising green emitting phosphor for excitation by blue light emitting diodes.",

author = "Wei L{\"u} and Zhendong Hao and Xia Zhang and Yongfu Liu and Yongshi Luo and Xingyuan Liu and Xiaojun Wang and Jiahua Zhang",

year = "2011",

doi = "10.1149/1.3518763",

language = "English",

volume = "158",

pages = "H124--H127",

journal = "Journal of the Electrochemical Society",

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TY - JOUR

T1 - Eu2+-activated Ca8 Zn (SiO4) 4Cl2

T2 - An intense green emitting phosphor for blue light emitting diodes

AU - Lü, Wei

AU - Hao, Zhendong

AU - Zhang, Xia

AU - Liu, Yongfu

AU - Luo, Yongshi

AU - Liu, Xingyuan

AU - Wang, Xiaojun

AU - Zhang, Jiahua

PY - 2011

Y1 - 2011

N2 - We report intense green luminescence upon blue light excitation in Eu 2+-activated Ca8 Zn (SiO4)4Cl 2 prepared by high temperature solid state reaction with nominal composition of (2-x) CaO-xZnO-SiO2-CaCl2 (0≤x≤1.1). It is observed that the material phase gradually converts from Ca3 SiO4 Cl2: Eu2+ to Ca8 Zn (SiO 4)4 Cl2: Eu2+ followed by improved luminescent properties with increasing x. The two phosphors both emit with a maximum at 505 nm. Significantly, Ca8 Zn (SiO4) 4 Cl2: Eu2+ shows a more intense excitation band in the blue centered at 450 nm. Upon 450 nm excitation, the integrated emission intensity of Ca8 Zn (SiO4)4 Cl 2: Eu2+ is 1.3 times stronger Ca8 Mg (SiO 4)4 Cl2: Eu2+ and nearly the same as Ca3 Sc2 Si3 O12: Ce3+ phosphors. Attempts to understand the origins of the intense luminescence are presented on the basis of diffuse reflection spectra and fluorescence decays of Ca8 Zn (SiO4)4 Cl2: Eu2+ in comparison with related phosphors. The present results suggest that Ca 8 Zn (SiO4)4 Cl2: Eu2+ could be a promising green emitting phosphor for excitation by blue light emitting diodes.

AB - We report intense green luminescence upon blue light excitation in Eu 2+-activated Ca8 Zn (SiO4)4Cl 2 prepared by high temperature solid state reaction with nominal composition of (2-x) CaO-xZnO-SiO2-CaCl2 (0≤x≤1.1). It is observed that the material phase gradually converts from Ca3 SiO4 Cl2: Eu2+ to Ca8 Zn (SiO 4)4 Cl2: Eu2+ followed by improved luminescent properties with increasing x. The two phosphors both emit with a maximum at 505 nm. Significantly, Ca8 Zn (SiO4) 4 Cl2: Eu2+ shows a more intense excitation band in the blue centered at 450 nm. Upon 450 nm excitation, the integrated emission intensity of Ca8 Zn (SiO4)4 Cl 2: Eu2+ is 1.3 times stronger Ca8 Mg (SiO 4)4 Cl2: Eu2+ and nearly the same as Ca3 Sc2 Si3 O12: Ce3+ phosphors. Attempts to understand the origins of the intense luminescence are presented on the basis of diffuse reflection spectra and fluorescence decays of Ca8 Zn (SiO4)4 Cl2: Eu2+ in comparison with related phosphors. The present results suggest that Ca 8 Zn (SiO4)4 Cl2: Eu2+ could be a promising green emitting phosphor for excitation by blue light emitting diodes.

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