The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED

Luo, Xixian; Cao, Weixiao; Sun, Fang-Wen

doi:10.1007/s11434-008-0392-4

Cited by 38 publications

(22 citation statements)

References 53 publications

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“…Among the technological strategies for obtaining W-LEDs, phosphor-converted white LEDs (pcW-LEDs) have become the most attractive strategy [1][2][3][4]. In this strategy white LED generated through pumping one phosphor emitting blue and yellow light under near-ultraviolet excitation is particularly promising.…”

Section: Introductionmentioning

confidence: 99%

Effects of RE3+ (RE = La, Ce, Pr, Sm, Dy, Ho, Er, and Tm) on the luminescence of Sr2MgSiO5:Eu2+ phosphors

et al. 2011

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Sr 2 MgSiO 5 :Eu 2+ phosphors were synthesized through a high temperature solid state reaction method. The phase and luminescence properties of the samples were characterized by X-ray diffraction (XRD) and a luminescence spectrometer. The effects of RE 3+ (RE = La, Ce, Pr, Sm, Dy, Ho, Er, and Tm) on the luminescent properties of the samples were studied. The results show that the luminescence spectrum of Sr 2 MgSiO 5 :Eu 2+ is a broad band composed of two emission peaks, at 460 and at 530 nm under near-ultraviolet excitation. Rare earth ions Re 3+ (RE = La, Ce, Pr, Sm, Dy, Ho, Er, and Tm) have great influence on the emission of Sr 2 MgSiO 5 :Eu 2+ phosphors. The La 3+ ion in Sr 2 MgSiO 5 :Eu 2+ phosphors greatly enhances the emission at 460 and 530 nm.

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Section: Introductionmentioning

confidence: 99%

Effects of RE3+ (RE = La, Ce, Pr, Sm, Dy, Ho, Er, and Tm) on the luminescence of Sr2MgSiO5:Eu2+ phosphors

et al. 2011

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“…The maximum radiative quantum efficiency was achieved at a Si doping concentration of 20 mol%. BaZr(BO 3 ) 2 :Eu 3+ , charge transfer state, peak-peak ratio, Judd-Ofelt theory Citation: Zhang Z P, Li G M, Zhang X S, et al Structural investigation and luminescent properties of BaZr(BO 3 ) 2 :Eu 3+ phosphors containing Si.In recent years, many researchers have focused on improving the luminescence properties of traditional materials [1-3] and preparing new luminescent phosphors with high performance [4,5]. Xing et al [3] reported an enhancement of the luminescent intensity of Gd 2 O 2 S:Tb phosphors through the use of a new synthetic method.…”

mentioning

confidence: 99%

“…In recent years, many researchers have focused on improving the luminescence properties of traditional materials [1-3] and preparing new luminescent phosphors with high performance [4,5]. Xing et al [3] reported an enhancement of the luminescent intensity of Gd 2 O 2 S:Tb phosphors through the use of a new synthetic method.…”

mentioning

confidence: 99%

“…Xing et al [3] reported an enhancement of the luminescent intensity of Gd 2 O 2 S:Tb phosphors through the use of a new synthetic method. Luo et al [5] reviewed the recent progress in alkaline earth silicate host luminescent materials with broad excitation bands for phosphor-converted white light emitting diodes. Borate-based systems have the advantages of low synthesis temperature, high UV transparency and good thermal stability.…”

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confidence: 99%

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Structural investigation and luminescent properties of BaZr(BO3)2:Eu3+ phosphors containing Si

Zhang

et al. 2010

Chin. Sci. Bull.

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Si 4+ -doped BaZr(BO 3 ) 2 :Eu 3+ phosphors are prepared by a conventional solid-state reaction. The influence of Si 4+ addition on the charge transfer state of Eu 3+ -O 2-and photoluminescence (PL) properties of BaZr(BO 3 ) 2 :Eu 3+ are discussed. Room temperature PL spectra indicated that efficient emission is obtained by Si doping. Increased values for the peak-peak ratio (PPR) of BaZr(BO 3 ) 2 :Eu 3+ at higher Si doping concentrations implied that the Eu 3+ ion is located in a more asymmetric environment in BaZr 0.8 Si 0.2 (BO 3 ) 2 :Eu 3+ than in the undoped samples. The Judd-Ofelt parameters Ω λ (λ=2,4) were calculated from the PL data, giving results that were consistent with those from the PPR. The maximum radiative quantum efficiency was achieved at a Si doping concentration of 20 mol%. BaZr(BO 3 ) 2 :Eu 3+ , charge transfer state, peak-peak ratio, Judd-Ofelt theory Citation: Zhang Z P, Li G M, Zhang X S, et al. Structural investigation and luminescent properties of BaZr(BO 3 ) 2 :Eu 3+ phosphors containing Si.In recent years, many researchers have focused on improving the luminescence properties of traditional materials [1-3] and preparing new luminescent phosphors with high performance [4,5]. Xing et al. [3] reported an enhancement of the luminescent intensity of Gd 2 O 2 S:Tb phosphors through the use of a new synthetic method. Luo et al.[5] reviewed the recent progress in alkaline earth silicate host luminescent materials with broad excitation bands for phosphor-converted white light emitting diodes. Borate-based systems have the advantages of low synthesis temperature, high UV transparency and good thermal stability. Eu 3+ is commonly adopted as an activator in commercial red phosphors [1,2]. There are two main radiative transitions that occur in the 4f levels of Eu 3+ . The emission centered at 591 nm is caused by a magnetic dipole transition of 5 D 0 -7 F 1 and

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“…Li et al [4] synthesized Sr 3 SiO 5 :Eu 2+ phosphor for white LED by high temperature solid-state reaction. Moreover, Luo et al [5] reviewed the recent progress in alkaline earth silicate host luminescent materials with broad excitation bands for phosphor-converted white LED. The research achievements mentioned above provide important references for actual application of phosphors.…”

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confidence: 99%

Preparation and characterization of monodisperse spherical particles of X-ray nano-phosphors based on Gd2O2S:Tb

et al. 2009

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Citation: Xing M M, Cao W H, Pang T, et al. Preparation and characterization of monodisperse spherical particles of X-ray nano-phosphors based on Gd 2 O 2 S:Tb.Monodisperse spherical Gd 2 O 2 S:Tb nanoparticles have been prepared using an improved homogeneous precipitation method combined with solid-gas sulfuration technology. The effects of Tb 3+ -doped concentration on luminescent intensity and color purity of samples were investigated, and the optimal Tb 3+ -doped concentration was determined. Under the excitation of X-ray, the obtained sample shows excellent luminescent properties, and its luminescent intensity is increased by about 50% under lower sulfuration temperature compared with that of the Gd 2 O 2 S:Tb nanoparticles prepared by complex precipitation method.rare earth oxysulfide, X-ray phosphor, nanoparticlePhosphor is a material that emits light after absorbing external energy (such as ultraviolet, X-ray and cathode ray). This kind of material has been widely applied in the fields of illumination, display, X-ray detection, etc. However, with the development of science and technology, lots of conventional phosphors have been unable to meet the requirements of current applications. In recent years, researchers have focused their work on the improvement of the luminescence property of traditional phosphors and preparation of new luminescent material with high performance, and they have made some achievements. For example, Xiong et al. [1] studied the influences of Ag and Mg dopants on the thermoluminescence (TL) of Li 2 B 4 O 7 (LBO):Cu phosphor, and the results indicate that proper concentrations of Ag and Mg can enhance the TL of LBO:Cu. Hu et al. [2,3] prepared Eu, Tb co-doped and Eu, Dy co-doped SiO 2 materials, and found that both of them are excellent tricolor fluorescence systems. Li et al. [4] synthesized Sr 3 SiO 5 :Eu 2+ phosphor for white LED by high temperature solid-state reaction. Moreover, Luo et al. [5] reviewed the recent progress in alkaline earth silicate host luminescent materials with broad excitation bands for phosphor-converted white LED. The research achievements mentioned above provide important references for actual application of phosphors. However, it is a pity that there are few investigations on X-ray phosphors.The rare earth oxysulfide phosphors have been widely used for X-ray display devices, because of their excellent X-ray-to-light conversion efficiency and color purity [6,7] . Among them, the Gd 2 O 2 S:Tb is considered as one of the most efficient X-ray phosphors [8] , and has been applied to the majority of the X-ray imaging systems such as the X-ray intensifying screen and the CCDbased X-ray detector [9] . In order to further improve the resolution of display devices to enhance the level of detection, the phosphors with higher quality are required. The quality of the phosphors is related to the luminescence efficiency, particle size, morphology and particle size distribution. It is well-known that monodisperse spherical particles are the most suitable ones for makin...

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The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED

Cited by 38 publications

References 53 publications

Effects of RE3+ (RE = La, Ce, Pr, Sm, Dy, Ho, Er, and Tm) on the luminescence of Sr2MgSiO5:Eu2+ phosphors

Effects of RE3+ (RE = La, Ce, Pr, Sm, Dy, Ho, Er, and Tm) on the luminescence of Sr2MgSiO5:Eu2+ phosphors

Structural investigation and luminescent properties of BaZr(BO3)2:Eu3+ phosphors containing Si

Preparation and characterization of monodisperse spherical particles of X-ray nano-phosphors based on Gd2O2S:Tb

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