Investigation of thermoluminescence in Li2B4O7 phosphors doped with Cu, Ag and Mg

Xiong, Zhengye; Tang, Qiang; Zhang, Chunxiang

doi:10.1007/s11433-007-0020-3

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…The results, as shown in Figure 6(a), are similar to that illustrated in ref. [10]. The curves show that the maximum TL response is around 380 nm and can be deconvoluted by 3 Gauss peaks (λ 1 = 425 nm, 1 ν = 23530 cm −1 ; λ 2 = 381 nm, 2 ν =26250 cm −1 ; λ 3 = 354 nm, 3 ν = 28250 cm −1 ) (Figure 6(b)).…”

Section: Tl Spectramentioning

confidence: 94%

“…The emission spec- trum of lithium tetraborate doped with Cu is around 360 nm [2] and the emission spectrum of LBO:Cu,In is around 420 nm [7,8] . This effect is caused by the preparation procedures or such factors as metalline impurity which can change the relative intensity among the 3 peaks [10] . Components of the 3 peaks in the spectra of Li 2 B 4 O 7 :Cu, Ag,P phosphors are reported in ref.…”

Section: Tl Spectramentioning

confidence: 99%

“…We have studied Li 2 B 4 O 7 phosphors doped with Cu and In [8,9] , and Li 2 B 4 O 7 phosphors doped with Cu, Ag and Mg [10] . We extended our work to Li 2 B 4 O 7 :Cu,Ag,P phosphors, and found the shape of TL glow curve and TL spectra are different from the results in ref.…”

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Thermoluminescence characteristics of Li2B4O7:Cu,Ag,P

2007

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Section: Tl Spectramentioning

confidence: 94%

Section: Tl Spectramentioning

confidence: 99%

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Thermoluminescence characteristics of Li2B4O7:Cu,Ag,P

2007

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“…Modifying the structure of the host lattice by introducing hetero-cations may effectively improve the luminescent intensity of a phosphor [7][8][9][10][11][12]. For example, Li et al [7] studied the influence of Ba 2+ and Ca 2+ impurities on the cathodoluminescent spectrum of Sr 5 (PO 4 ) 3 Cl:Eu 2+ .…”

mentioning

confidence: 99%

“…For example, Li et al [7] studied the influence of Ba 2+ and Ca 2+ impurities on the cathodoluminescent spectrum of Sr 5 (PO 4 ) 3 Cl:Eu 2+ . Xiong et al [8] found that appropriate concentrations of Ag and Mg can enhance the thermoluminescence of Li 2 B 4 O 7 :Cu. In this paper, we report a significant shift and increase in the excitation intensity of the charge transfer band in BaZr(BO 3 ) 2 :Eu 3+ phosphors after Si 4+ doping.…”

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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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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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Investigation of thermoluminescence in Li2B4O7 phosphors doped with Cu, Ag and Mg

Cited by 17 publications

References 11 publications

Thermoluminescence characteristics of Li2B4O7:Cu,Ag,P

Thermoluminescence characteristics of Li2B4O7:Cu,Ag,P

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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