Optical properties of Eu2+-doped strontium borate glasses containing F− and Li+ ions

Huang, Yanlin; Jang, Kiwan; Wang, Xigang; Jiang, Chuanfang

doi:10.1016/s1002-0721(08)60124-6

Cited by 18 publications

(8 citation statements)

References 16 publications

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“…It is well known that the optical transition of the host glass is associated with its band gap, and visible absorption of the Eu 2+ ions doped glasses are determined by the lowest 4f-5d transition of the Eu 2+ ions. By comparison with the reported oxide glass hosts [4,9], the λ abs of the present Eu 2+ ions doped chalcohalide glasses experience an obvious red shift. In particular, further red shift can be observed with the decrease of CsCl content.…”

Section: Methodsmentioning

confidence: 64%

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Luminescence behaviors of the Eu2+ ions in the GeS2-Ga2S3-CsCl chalcohalide glasses

Yan

Liu

Wang

et al. 2011

Journal of Non-Crystalline Solids

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Section: Methodsmentioning

confidence: 64%

“…[1][2][3][4]. The transitions between these energy levels between the 4f 7 and 4f 6 5d configurations of Eu 2+ are dipole allowed giving the emission intensities much stronger than the f-f transitions in the trivalent ions [5].…”

Section: Introductionmentioning

confidence: 99%

Luminescence behaviors of the Eu2+ ions in the GeS2-Ga2S3-CsCl chalcohalide glasses

Yan

Liu

Wang

et al. 2011

Journal of Non-Crystalline Solids

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“…The parallel characteristics lead to the layered structure, what is more, the polarization of boric acid is low, so that Eu 3+ is more stable than Eu 2+ in this structure. 48 Besides, there are some interstitial defects in YAB. Y 3+ can be replaced by Eu 2+ without producing the imbalance of charge, and it is due to that the interstitial defects can be used as the charge compensation (Eu 2+…”

Section: Incomplete Reductionmentioning

confidence: 99%

Coexistence mechanism of Eu²⁺/Eu³⁺ ions in YAl₃(BO₃)₄: Crystal structure, luminescence property, and substitution defects

Liu

Wang

et al. 2019

J Am Ceram Soc

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The coexistence mechanism of Eu 2+ and Eu 3+ ions in YAl 3 (BO 3 ) 4 host under different reducing conditions is investigated and confirmed in great detail, which can be described by three aspects as following. First, Eu 3+ is protected by the layered structure of YAl 3 (BO 3 ) 4 . Second, the number of the interstitial defects ((Al) i˙˙˙, (Y) i˙˙˙) increases with increasing Eu 2+ to maintain the charge balance of the system. And these defects can capture free electrons which are used for the reduction of Eu 3+ . Finally, free holes become more and more with the number of nonequivalent substitution defects (Eu Y ') increasing, which make the 5d electrons of Eu 2+ easily escape to the conduction band and Eu 2+ convert to Eu 3+ . This work will be of great significance to research coexistence of multiple valence ions in the structure of borate and defect motion with nonequivalent substitution.presents polysynthetic twin which is composed of a number of parallel single crystals. The parallel layer structure is beneficial for the movement of electrons and defects. 26 Many possibilities for the luminescence of activators are created since its unique structure. Recently, Prokhorov et al. reported an interesting phenomenon about EuAl 3 (BO 3 ) 4 crystals. The X-ray irradiation can modify the color of the EuAl 3 (BO 3 ) 4 crystal, and annealing of the crystal at 600°C can lead to the restoration of the original color. It was concluded that Eu 2+ ion located at the Eu 3+ site in the EuAl 3 (BO 3 ) 4 crystal lattice. 27 However, when Eu concentration is low, Eu 3+ is always existed in YAB no matter how strong the reduction atmosphere is. Generally, the reasons for the coexistence of multivalent ions are imbalance of the charge, defects, and crystal structure. 28 For further exploration, Eu 2+ /Eu 3+ -doped YAl 3 (BO 3 ) 4 phosphors are synthesized in CO or H 2 atmospheres. The structure and morphological characteristics are studied by the X-ray diffraction (XRD), the field emission scanning electron microscope (SEM), and diameter analyzer. The luminescence properties and luminescence decay curves are investigated in detail. Meanwhile, the energy transfer process and behavior of intrinsic and substitution defects are further analyzed. The model of charge compensation is established. The surface chemical compositions of YAB:Eu are determined by X-ray Photoelectron Spectroscopy (XPS). Moreover, the influence of crystal structure and defect motion on incomplete reduction is also explored.

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“…18 Moreover, F À ions can be doped into the matrices efficiently by substitution of O 2À sites in the crystal lattice due to their similar electronic conguration and nearly same ionic radius. 19,20 In downconversion system, the inuence of uoride on f-f transition of Eu 3+ was investigated, and the results showed that substitution of F À for O 2À might reduce the magnitude of the phonon energy and quenched NR transition processes to enhance the luminescence intensity. 21,22 In addition, Sun et al reported that the replacement of OH À by F À can improve the luminescence intensity signicantly, which may be caused by the decreased uorescence quenching of activator ion.…”

Section: 2mentioning

confidence: 99%

Upconversion luminescence enhancement and temperature sensing behavior of F⁻ co-doped Ba₃Lu₄O₉:Er³⁺/Yb³⁺ phosphors

Liu

Zhou

et al. 2017

RSC Adv.

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A series of Ba 3 Lu 4 O 9 :Er 3+ /Yb 3+ (EYBLO) phosphors co-doped with F À ions were synthesized by a simple solid-state reaction method. The results showed that the primary rhombohedral structure was maintained and the crystal lattice began to shrink when F À ions were introduced into the host matrix to occupy the O 2À site. The agglomerations and the impurities (OH À and CO 2 ) with higher phonon energy on the sample surface could be minimized and the sample crystallinity could be improved. Under 980 nm laser diode excitation, the green and red UC emissions of the EYBLO:0.4F À sample show nearly 5-and 7.5-fold enhancements in contrast to F À -free EYBLO. The upconversion luminescence can be finely tuned from yellow to red light to some extent by increasing F À concentration. Based on pumppower dependence and decay lifetime analysis, the energy level diagram was illustrated and the upconversion energy-transfer mechanism was discussed. The green and red emission enhancements are attributed to the modification of the local crystal field of Er 3+ ions and reduction of crystal site symmetry.The cross-relaxation and back-energy-transfer processes play an important role to enhance the red/ green UC emission intensity ratios. The fluorescence intensity ratio technique was employed to investigate the temperature sensing behavior of the synthesized phosphors. The temperature sensing properties can be enhanced by doping of F À ions, and the maximum sensitivity is found to be 44.57 Â 10 À4 K À1 at 523 K. It is promising to provide an alternative approach for enhancing UC luminescence and the temperature sensitivity in oxide matrixes and then obtain high-quality optical temperature-sensing materials by simply co-doping F À ions.

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Optical properties of Eu2+-doped strontium borate glasses containing F− and Li+ ions

Cited by 18 publications

References 16 publications

Luminescence behaviors of the Eu2+ ions in the GeS2-Ga2S3-CsCl chalcohalide glasses

Luminescence behaviors of the Eu2+ ions in the GeS2-Ga2S3-CsCl chalcohalide glasses

Coexistence mechanism of Eu²⁺/Eu³⁺ ions in YAl₃(BO₃)₄: Crystal structure, luminescence property, and substitution defects

Upconversion luminescence enhancement and temperature sensing behavior of F⁻ co-doped Ba₃Lu₄O₉:Er³⁺/Yb³⁺ phosphors

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Optical properties of Eu2+-doped strontium borate glasses containing F− and Li+ ions

Cited by 18 publications

References 16 publications

Luminescence behaviors of the Eu2+ ions in the GeS2-Ga2S3-CsCl chalcohalide glasses

Luminescence behaviors of the Eu2+ ions in the GeS2-Ga2S3-CsCl chalcohalide glasses

Coexistence mechanism of Eu2+/Eu3+ ions in YAl3(BO3)4: Crystal structure, luminescence property, and substitution defects

Upconversion luminescence enhancement and temperature sensing behavior of F− co-doped Ba3Lu4O9:Er3+/Yb3+ phosphors

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Coexistence mechanism of Eu²⁺/Eu³⁺ ions in YAl₃(BO₃)₄: Crystal structure, luminescence property, and substitution defects

Upconversion luminescence enhancement and temperature sensing behavior of F⁻ co-doped Ba₃Lu₄O₉:Er³⁺/Yb³⁺ phosphors