Bright white-light upconversion from core-shell nanocrystals through interfacial energy transfer

Tao, Lili; Long, Yan; Lou, Yajun; Li, Yonghui; Zhao, Yu; Zhou, Bo; Li, Jingbo

doi:10.1016/j.dyepig.2018.02.044

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…Because the 1 S 0 → 3 P 1 transition of Bi 3+ (260 nm) is more intense than the CTB (230 nm), the 260 nm is the most efficient excitation wavelength for (Y 0.95-x Eu 0.05 Bi x )BO 3 spheres. Under excitation at 260 nm, the emission spectra show emission peaks at~592 nm, 610 and~627 nm,~650 and~673 nm, and~694 and~708 nm, which are assigned to the typical 5 D 0 → 7 F J (J = 1,2,3,4) transition of Eu 3+ ions respectively [26] (Figure 4(b)). Because activator Eu 3+ occupies the Y 3+ site in hexagonal structure with the point symmetry of S 6 , the magnetic dipole 5 D 0 → 7 F 1 transition of Eu 3+ at 592 nm takes the dominate role, rather than the forced electric dipole 5 D 0 → 7 F 2 transition of Eu 3+ ions at~610 and~627 nm [12][13][14][15][16].…”

Section: Morphology and Phase Structurementioning

confidence: 99%

“…The shortened lifetime of Bi 3+ emission at higher Eu content (Figure 7(b) and Figure S2) confirms the energy transfer process from Bi 3+ to Tb 3+ and Eu 3+ . In the absence of concentration quenching, the efficiency (η ET ) of the Bi 3+ → "Eu 3+ and Tb 3+ " energy transfer can be calculated from the fluorescence lifetime with η ET = 1-τ/τ 0 , where τ and τ 0 are the fluorescence lifetime of the Bi 3+ emission in the presence and absence of the acceptor [18,26]. The η TE value, calculated from Figure 7(b), gradually increases from 2% for y = 0.01 to 63% for y = 0.09.…”

Section: Luminescence Behavior Of (Y Tb Eu Bi)bo 3 Spheresmentioning

confidence: 99%

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Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO₃ to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

Zhu

Fan

Liu

et al. 2020

Journal of Asian Ceramic Societies

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To prevent counterfeiting, a lot of advanced security technologies have been developed, including luminescent printing. Therefore, the pigments with advanced security features are urgently pursued for luminescence printing-based anti-counterfeiting technology.Here, micron-sized spheres of hexagonal-structured and color-tunable emitting (Y, Tb, Eu, Bi)BO 3 have been rapidly synthesized by microwave processing, followed by a proper annealing. Incorporation of Bi 3+ greatly enhances the emission intensity of Eu 3 + and of Tb 3+ . Under the excitation at 260 nm, the spheres exhibit UV emission at 330 nm ( 3 P 1 → 1 S 0 transition of Bi 3+ ), green emission at 546 nm ( 5 D 4 → 7 F 5 transition of Tb 3+ ) and orange-red emission at 592 nm ( 5 D 0 → 7 F 1 transition of Eu 3+ ), mainly due to the three energy transfer processes of Bi 3+ →Tb 3+ , Bi 3+ →Eu 3+ , and Tb 3+ →Eu 3+ . However, under the excitation at 230 nm, the Tb 3+ →Eu 3+ energy transfer contributes to the orange-red emission of Eu 3+ and the green emission of Tb 3+ , in the absence of Bi 3+ emission. The maximum energy transfer efficiency of Bi 3+ → "Eu 3+ and Tb 3+ " and Tb 3+ → Eu 3+ is 63% and 50% for (Y 0.883 Tb 0.02 Eu 0.09 Bi 0.007 )BO 3 . The (Y 0.963 Tb 0.02 Eu 0.01 Bi 0.007 )BO 3 spheres exhibit a distinct excitation-dependent luminescence behavior. Facile switching the excitation wavelength from 260 nm to 230 nm yields emission color changing from orange to green yellow, which possesses the advanced security feature.

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Section: Morphology and Phase Structurementioning

confidence: 99%

Section: Luminescence Behavior Of (Y Tb Eu Bi)bo 3 Spheresmentioning

confidence: 99%

Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO₃ to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

Zhu

Fan

Liu

et al. 2020

Journal of Asian Ceramic Societies

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“…However, current researches mainly focus on the occurrence level of the IET phenomenon in core−shell structure, and the objects that are usually compared either do not have the core−shell structure or there is no occurrence of IET phenomenon. 35 In addition, in these reports, some of them doped sensitizer ions into the shell and activator ions into the core, and some of them doped sensitizer ions into the core and activator ions into the shell, 36 and so far, there has been no comparative study on the two cases.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of SiO₂:Tb³⁺@Gd₂O₃:Eu³⁺ and Its Inverted Tb³⁺-Eu³⁺ Core–Shell Phosphors

Xie,

Liu,

Yang

et al. 2024

Inorg. Chem.

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How to effectively improve energy transfer efficiency and luminous intensity inspired us to synthesize a series of SiO2:x%Tb3+@Gd2O3:y%Eu3+ samples, study their luminescence properties and interfacial energy transfer (IET), and compare with SiO2:x%Eu3+@Gd2O3:y%Tb3+. The results show that SiO2:x%Tb3+@Gd2O3:y%Eu3+ can exhibit adjustable multicolor luminescence from red to green at different concentrations of Eu3+ and Tb3+ or under different excitation wavelengths, and there exists efficient IET from Tb3+ to Eu3+ in SiO2:x%Tb3+@Gd2O3:y%Eu3+ and SiO2:x%Eu3+@Gd2O3:y%Tb3+, which improves the energy transfer efficiency and luminous intensity. In addition, the luminescence properties are different between SiO2:3%Tb3+@Gd2O3:3%Eu3+ and SiO2:3%Eu3+@Gd2O3:3%Tb3+, and the energy transfer efficiency of Tb3+ → Eu3+ in SiO2:3%Tb3+@Gd2O3:3%Eu3+ is obviously higher than that in SiO2:3%Eu3+@Gd2O3:3%Tb3+. The present study not only developed a kind of multicolor luminescent phosphor but also offered an important new strategy for improving the energy transfer efficiency and luminescent intensity.

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“…Zhou et al achieved upconversion of photons and accurate control of donor–acceptor interactions via interfacial energy transfer . Tao et al applied the interfacial energy transfer method to core–shell structures and proved a new white light emission upconversion strategy . Zhou et al realized enhancing multiphoton upconversion by interfacial energy transfer in multilayered nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

“…20 Tao et al applied the interfacial energy transfer method to core−shell structures and proved a new white light emission upconversion strategy. 21 multilayered nanoparticles. 22 Wang et al synthesized hollow double-shelled TiO 2 :x%Eu 3+ @SiO 2 :y%Tb 3+ nanospheres and analyzed the mechanism of interfacial energy transfer.…”

Section: Introductionmentioning

confidence: 99%

SiO₂:Tb³⁺@Lu₂O₃:Eu³⁺ Core–Shell Phosphors: Interfacial Energy Transfer for Enhanced Multicolor Luminescence

et al. 2021

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Uniform and well-dispersed SiO2:x%Tb3+@Lu2O3:y%Eu3+ core–shell spherical phosphors were synthesized via a solvothermal method followed by a subsequent calcination process. The structure, phase composition, and morphology of the samples were studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that the Lu2O3:Eu3+ layer was evenly coated on the surface of SiO2:Tb3+ spheres and the shell thickness was about 45–65 nm. The PL spectra and fluorescence lifetimes of the samples were further studied. It was proved that the multicolor luminescence of the samples could be realized by changing the doping concentration ratio of Eu3+ or by changing the excitation wavelengths. Compared with SiO2@Lu2O3:3%Tb3+,6%Eu3+, SiO2:3%Tb3+@Lu2O3:6%Eu3+ showed stronger luminescence intensity, longer fluorescence lifetime, and higher energy transfer efficiency, which was attributed to the effective interfacial energy transfer, and the interfacial energy transfer mechanism from Tb3+ to Eu3+ was a dipole–dipole interaction mechanism. The XPS results indicated that the sample contained a high content of Si–O–Lu bonds, which proved that there was a strong interaction between the SiO2 core and the Lu2O3 shell, making the interfacial energy transfer possible. These results provided a new idea for luminescence enhancement and multicolor luminescence.

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Bright white-light upconversion from core-shell nanocrystals through interfacial energy transfer

Cited by 16 publications

References 24 publications

Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO₃ to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO₃ to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

A Comparative Study of SiO₂:Tb³⁺@Gd₂O₃:Eu³⁺ and Its Inverted Tb³⁺-Eu³⁺ Core–Shell Phosphors

SiO₂:Tb³⁺@Lu₂O₃:Eu³⁺ Core–Shell Phosphors: Interfacial Energy Transfer for Enhanced Multicolor Luminescence

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Bright white-light upconversion from core-shell nanocrystals through interfacial energy transfer

Cited by 16 publications

References 24 publications

Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO3 to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO3 to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

A Comparative Study of SiO2:Tb3+@Gd2O3:Eu3+ and Its Inverted Tb3+-Eu3+ Core–Shell Phosphors

SiO2:Tb3+@Lu2O3:Eu3+ Core–Shell Phosphors: Interfacial Energy Transfer for Enhanced Multicolor Luminescence

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Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO₃ to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

Implanting bismuth in color-tunable emitting microspheres of (Y, Tb, Eu)BO₃ to generate excitation-dependent and greatly enhanced luminescence for anti-counterfeiting applications

A Comparative Study of SiO₂:Tb³⁺@Gd₂O₃:Eu³⁺ and Its Inverted Tb³⁺-Eu³⁺ Core–Shell Phosphors

SiO₂:Tb³⁺@Lu₂O₃:Eu³⁺ Core–Shell Phosphors: Interfacial Energy Transfer for Enhanced Multicolor Luminescence