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Citation: LI Xia, XU Jianyi, WANG Ruifen, ZHANG Yin. Preparation and Luminescent Properties of Sr_(1-1.5x)Mo_0.8Si_0.2O_3.8:Eu_x³⁺ Powder for LED Application[J]. Chinese Journal of Applied Chemistry, ;2011, 28(12): 1393-1396. doi: 10.3724/SP.J.1095.2011.00721 shu

Preparation and Luminescent Properties of Sr_(1-1.5x)Mo_0.8Si_0.2O_3.8:Eu_x³⁺ Powder for LED Application

1.
School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010

Corresponding author: LI Xia,
Received Date: 6 December 2010
Available Online: 23 March 2011
Fund Project: 内蒙古科技大学创新基金项目(2009NC070) (2009NC070)

Red phosphors Sr_(1-1.5x)Mo_0.8Si_0.2O_3.8:Eu_x³⁺(x=0.1,0.2,0.3,0.4,0.5) used for LED were synthesized by high temperature solid state method.XRD,fluorescence excitation and emission spectra were used for analysis the phase composition and luminescent properties of the materials.The XRD result of sample x=0.1 is consistent with JCPDS-Card No.08-0482(SrMoO₄).As luminescence center,Eu³⁺ takes the position of Sr²⁺.With the increase of Eu³⁺ concentration,which represents the concentration of Eu³⁺,the emission intensities of ⁵D₀-⁷F₁ magnetic dipole transition at 593 nm and ⁵D₀-⁷F₂ transition at 614 nm were converted.When x ≤0.4,the magnetic dipole transition ⁵D₀-⁷F₁ dominates emitting with an orange light.For x=0.5,the electric dipole transition ⁵D₀-⁷F₂ dominates emitting with red light.The excessive doped Eu³⁺ ion in the lattice could not enter into SrMoO₄ site,but only exist in lattice vacancy formed defect,which made Eu³⁺ in unsymmetrical lattice site.It is lead to promote the electric dipole ⁵D₀-⁷F₂ transitions and reduce the magnetic dipole ⁵D₀-⁷F₁ transitions.Therefore,phosphors with different emitting color can be obtained by adjusting the content of activator.In Eu³⁺ doped strontium silicon molybdate system,under excitation at 614 nm,the wide bands at 368 nm and the absorption band at 467 nm corresponded to absorption of the host matrix and the ⁷F₀-⁵D₂ transitions,respectively.The extra activator Eu³⁺ at lattice gap(x=0.5) promote the absorption bands 3 times more than that for x=0.4.The material can produce tunable orange-red color,and its excitation wavelength can match with UV LED chips very well.
- white light LED,
- Sr_(1-1.5x)Mo_0.8Si_0.2O_3.8:Eu_x³⁺,
- luminescence properties
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Preparation and Luminescent Properties of Sr(1-1.5x)Mo0.8Si0.2O3.8:Eux3+ Powder for LED Application

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通讯作者: 陈斌, bchen63@163.com

Preparation and Luminescent Properties of Sr_(1-1.5x)Mo_0.8Si_0.2O_3.8:Eu_x³⁺ Powder for LED Application