Efficient energy transfer induced tunable emission in Ce3+ and Eu2+ co-doped Ba1.2Ca0.8SiO4 phosphor

Tong, Xubo; Han, Jin; Cheng, Zhe; Wu, Pianpian; Zhang, Xinmin

doi:10.1016/j.jlumin.2019.116670

Cited by 9 publications

(3 citation statements)

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“…The energy difference between bands I and II is 1960 cm –1 and is 2080 cm –1 for bands III and IV. The energy differences are close to the theoretical spin-orbit splitting of Ce 3+ (about 2000 cm –1 ), which indicates that the doped Ce 3+ ions occupy two kinds of crystallographic sites (denoted Ce I and Ce II) . The two PLE spectra show a clear difference.…”

Section: Results and Discussionmentioning

confidence: 95%

“…The energy differences are close to the theoretical spin-orbit splitting of Ce 3+ (about 2000 cm −1 ), which indicates that the doped Ce 3+ ions occupy two kinds of crystallographic sites (denoted Ce I and Ce II). 37 The two PLE spectra show a clear difference. One exhibits an excitation band ranging from 250 to 360 nm (corresponding to Ce I excitation), and the other presents an excitation band ranging from 250 to 400 nm (corresponding to Ce II excitation).…”

Section: ■ Experimental Sectionmentioning

confidence: 97%

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Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce³⁺-, Tb³⁺-, and Mn²⁺-Doped Silicate Phosphors

et al. 2020

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It is unquestionably true that site occupation and energy transfer play important roles in the luminescent properties of optical materials from both practical applications and theoretical research. In this paper, multisite-occupancy-driven multiple energy transfers were used as a straightforward strategy to achieve single-composition white-light emission in Ce3+-, Tb3+-, and Mn2+-doped Ba1.2Ca0.8SiO4 (BCS) phosphors. The Ce3+-, Tb3+-, and Mn2+-doped T-phase orthosilicate BCS samples were synthesized by traditional solid-state reactions. The phase composition was checked via X-ray diffraction (XRD), and the luminescent properties were systematically studied by photoluminescence spectroscopy and fluorescence decay curves. A detailed study on the efficient and multiple energy transfers of Ce I → Mn2+, Ce II → Tb3+, and Ce II → Tb3+ → Mn2+ was carried out. Satisfactorily, the selected phosphor exhibits a high internal quantum efficiency (QE) of 81% and good thermal stability. In addition, an evident negative thermal quenching phenomenon, i.e., the emission intensity increases with increasing temperature, is provided. Moreover, the mechanism of negative thermal quenching was proposed. On the basis of these excellent luminescence properties, a white LED with color-rendering index (R a = 89) was fabricated by integrating the phosphor on an n-UV 365 nm chip. These results show that the materials present potential application in the field of phosphor-converted white LEDs.

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Section: Results and Discussionmentioning

confidence: 95%

Section: ■ Experimental Sectionmentioning

confidence: 97%

Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce³⁺-, Tb³⁺-, and Mn²⁺-Doped Silicate Phosphors

et al. 2020

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“…It is well known that the 5d → 4f transition energy of Ce 3+ is slightly higher than that of Eu 2+ based on the energy level of the rare-earth ions when Ce 3+ and Eu 2+ are in the same crystal environment . Therefore, there is usually energy transfer from Ce 3+ to Eu 2+ , whether in oxides, nitrides, fluorides, nitrogen oxides, phosphates, borates, silicates, or in most aluminate and aluminosilicate . In these host materials, when Ce 3+ and Eu 2+ are codoped, the Forster resonant energy transfer may perhaps occur, and a necessary condition for the realization of the energy transfer process is the existence of a sufficient spectral overlap between the emission of the donor and the absorption of the acceptor, and a suitable distance between the donor and the acceptor .…”

Section: Introductionmentioning

confidence: 99%

Luminescence and Energy Transfer of Color-Tunable Y₂Mg₂Al₂Si₂O₁₂:Eu²⁺,Ce³⁺ Phosphors

Zhang

Zheng

et al. 2021

Inorg. Chem.

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Color-tunable phosphors can be obtained through codoping strategies and energy transfer regulation. Ce 3+ and Eu 2+ are the most common and effective activator ions used in phosphor materials. However, the energy transfer from Eu 2+ to Ce 3+ is rarely reported. In this work, Y 2 Mg 2 Al 2 Si 2 O 12 (YMAS):Eu 2+ ,Ce 3+ phosphors were successfully synthesized, which was confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Rietveld refinement, scanning electron microscopy (SEM) and element mapping images, and spectral information. The luminescent color of YMAS:Eu 2+ ,Ce 3+ phosphors could be tuned from blue to cyan to light green to yellow-green and finally to green-yellow, which was achieved by adjusting the energy transfer between different dopants. The energy transfer from Eu 2+ to Ce 3+ was confirmed by photoluminescence spectra and fluorescence decay curves. Within the experimental gradient, the energy transfer efficiency could reach up to 48%. At 373 K, the Y 1.99 Mg 1.99 Al 2 Si 2 O 12 :0.01Eu 2+ ,0.01Ce 3+ (YMAS:0.01Eu 2+ ,0.01Ce 3+ ) phosphor exhibited a total integral emission loss of only 8%, and the emission peak intensity decreased to 95%, indicating the excellent thermal stability. The white light-emitting diode (WLED) fabricated by the YMAS:0.01Eu 2+ ,0.01Ce 3+ phosphor has the same level correlated color temperature (CCT = 5841 K), greatly improved color rendering index (R a = 87.8), and higher quality white light color (CIE = (0.3258, 0.3214)) than the WLED made by the YMAS:0.01Eu 2+ phosphor, indicating that the performance of the phosphor was significantly improved by introducing Ce 3+ . This work provides an effective guide for the design and development of highly efficient color-tunable phosphors involving energy transfer from Eu 2+ to Ce 3+ in some specific materials, such as garnet structures.

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Novel orange-red emitting Sm3+-doped Bi4Sr3Te5O19 phosphors with high color purity for white light-emitting diodes

Song

2020

J Mater Sci: Mater Electron

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Efficient energy transfer induced tunable emission in Ce3+ and Eu2+ co-doped Ba1.2Ca0.8SiO4 phosphor

Cited by 9 publications

References 46 publications

Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce³⁺-, Tb³⁺-, and Mn²⁺-Doped Silicate Phosphors

Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce³⁺-, Tb³⁺-, and Mn²⁺-Doped Silicate Phosphors

Luminescence and Energy Transfer of Color-Tunable Y₂Mg₂Al₂Si₂O₁₂:Eu²⁺,Ce³⁺ Phosphors

Novel orange-red emitting Sm3+-doped Bi4Sr3Te5O19 phosphors with high color purity for white light-emitting diodes

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Efficient energy transfer induced tunable emission in Ce3+ and Eu2+ co-doped Ba1.2Ca0.8SiO4 phosphor

Cited by 9 publications

References 46 publications

Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce3+-, Tb3+-, and Mn2+-Doped Silicate Phosphors

Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce3+-, Tb3+-, and Mn2+-Doped Silicate Phosphors

Luminescence and Energy Transfer of Color-Tunable Y2Mg2Al2Si2O12:Eu2+,Ce3+ Phosphors

Novel orange-red emitting Sm3+-doped Bi4Sr3Te5O19 phosphors with high color purity for white light-emitting diodes

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Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce³⁺-, Tb³⁺-, and Mn²⁺-Doped Silicate Phosphors

Multisite-Occupancy-Driven Efficient Multiple Energy Transfer: A Straightforward Strategy to Achieve Single-Composition White-Light Emission in Ce³⁺-, Tb³⁺-, and Mn²⁺-Doped Silicate Phosphors

Luminescence and Energy Transfer of Color-Tunable Y₂Mg₂Al₂Si₂O₁₂:Eu²⁺,Ce³⁺ Phosphors