Intrinsic imperfect and zero thermal quenching property for a novel β-NaYF4:Eu3+,Tb3+ red-light emitting phosphor for NUV LEDs

Ling, Shaokun; Qin, Xiaoyan; chen, Chang; Meng, Kai; Yan, Yifeng; Ming, Junyun; Liao, Sen; Huang, Yingheng; Hou, Lei

doi:10.1016/j.jallcom.2023.168923

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…The Eu 3+ and Yb 3+ are incorporated into the matrix. In our previous studies, − we found that the down-conversion luminescent ions: Sm 3+ , Dy 3+ , and Tb 3+ lead to a decrease of thermal luminescent stability of Eu 3+ , despite the existence of an energy transfer effect. Therefore, we tried to utilize upconversion ion Yb 3+ to improve the ZTQ property of Eu 3+ in this study.…”

Section: Introductionmentioning

confidence: 85%

Design of Eu³⁺-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Ling,

Wang,

Qin

et al. 2024

Inorg. Chem.

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Although being applied in various fields, white light emitting diodes (WLEDs) still have drawbacks that urgently need to be conquered: the luminescent intensity of commercial phosphors sharply decreases at working temperature. In this study, we calculated the forming energy of defects and confirmed that the V Na defect state can stably exist in β-NaGdF 4 , by density functional theory (DFT) calculation. Furthermore, we predicted that the V Na vacancies would provide a zero thermal quenching (ZTQ) property for the β-NaGdF 4based red-light phosphor. Then, a series of β-NaGdF 4 :xEu 3+ and β-NaGdF 4 :0.25Eu 3+ ,yYb 3+ red-light phosphors were synthesized by the hydrothermal method. We found that β-NaGdF 4 :0.25Eu 3+ and β-NaGdF 4 :0.25Eu 3+ ,0.005Yb 3+ phosphors possess ZTQ properties at a temperature range between 303−483 K and 303−523 K, respectively. The thermoluminescence (TL) spectra were employed to calculate the depth and density of the V Na vacancies in β-NaGdF 4 :0.25Eu 3+ and β-NaGdF 4 :0.25Eu 3+ ,0.005Yb 3+ . Combining the DFT calculation with characterization results of TL spectra, it is concluded that electrons stored in V Na vacancies are excited to the exited state of Eu 3+ to compensate for the loss of Eu 3+ luminescent intensity. This will lead to an increase of luminescent intensity at high temperatures and facilitate the samples to improve ZTQ properties. WLEDs were obtained with CRI = 83.0, 81.6 and CCT = 5393, 5149 K, respectively, when phosphors of β-NaGdF 4 :0.25Eu 3+ and β-NaGdF 4 :0.25Eu 3+ ,0.005Yb 3+ were utilized as the red-light source. These results indicate that these two phosphors may become reliable red-light sources with high antithermal quenching properties for WLEDs.

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Section: Introductionmentioning

confidence: 85%

Design of Eu³⁺-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Ling,

Wang,

Qin

et al. 2024

Inorg. Chem.

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“…For some examples, please refer to the cited literature. [3][4][5][6][7][8][9][10] In this important research area, our group has focused on the Tb 3+ →Eu 3+ energy transfer in Tb-based crystalline materials, i.e. in conditions where the Tb 3+ -Tb 3+ energy migration is present.…”

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confidence: 99%

Excited State Dynamics of Undoped and Eu³⁺-doped TbAl₃(BO₃)₄ Crystals

Ruggieri¹,

Ceccon²,

Bettinelli³

et al. 2023

ECS J. Solid State Sci. Technol.

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The room-temperature luminescence spectra and emission decay curves of undoped and Eu3+-doped TbAl3(BO3)4 crystals, grown using the flux growth technique, are presented and discussed. The experimental results show that excitation of the Tb3+ levels gives rise to 5D0 emission from the Eu3+ ion, and therefore non-radiative energy transfer is operative involving the two ions. Analysis of the experimental data indicates that the excitation of the Tb3+ donor ion gives rise to diffusion limited migration of the energy in the 5D4 level of the Tb3+ subset of cations, followed by the energy transfer process populating the 5D0 level of Eu3+. Upon increasing the concentration of the Eu3+ acceptor, the mainly green emission intensity and the decay time of the 5D4 level decrease, while the red emission of 5D0 becomes dominant. The experimental data are interpreted on the basis of the trigonal huntite-type structure of the double borate crystals under investigation.

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Unraveling the Remarkable Influence of Square Antiprism Geometry on Highly Efficient Far‐Red Emission of Eu³⁺ in Borotellurate Phosphors for Versatile Utilizations

Li,

Niu,

Liu

et al. 2024

Laser & Photonics Reviews

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Eu3+‐activated red‐emitting inorganic phosphors have been favored highly for their classical 5D0→7FJ (J = 0, 1, 2, 3, 4) emissions. However, the fatal drawbacks of poor luminous efficacy and weak 5D0→7F4 transition persist, resulting in the ongoing challenge of achieving far‐red emission. This research reports series of highly efficient far‐red phosphors LnTeBO5 (Ln = La3+, Y3+, Gd3+):Eu3+ with anomalously strong 5D0→7F4 transition, resulting from the distorted square antiprism [Ln/EuO8]. Both the luminous efficacy and thermal stability can be greatly enhanced via the simple composition variation. [Ln/EuO8] square antiprism‐triggered 5D0→7F2,4 transitions are elucidated in depth, acquiring ultra‐high luminous efficacy (IQE = 95%, EQE = 40%, and AE = 42%) and near‐zero thermal quenching (99%@150°C and 98%@200°C). Subsequently, the versatile utilizations in indoor lighting, plant growth lighting, and security ink are illustrated. This finding establishes a deep understanding for constructing high‐quality far‐red phosphors via the Eu3+‐centered structural units of square antiprism.

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Intrinsic imperfect and zero thermal quenching property for a novel β-NaYF4:Eu3+,Tb3+ red-light emitting phosphor for NUV LEDs

Cited by 5 publications

References 49 publications

Design of Eu³⁺-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Design of Eu³⁺-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Excited State Dynamics of Undoped and Eu³⁺-doped TbAl₃(BO₃)₄ Crystals

Unraveling the Remarkable Influence of Square Antiprism Geometry on Highly Efficient Far‐Red Emission of Eu³⁺ in Borotellurate Phosphors for Versatile Utilizations

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Intrinsic imperfect and zero thermal quenching property for a novel β-NaYF4:Eu3+,Tb3+ red-light emitting phosphor for NUV LEDs

Cited by 5 publications

References 49 publications

Design of Eu3+-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Design of Eu3+-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Excited State Dynamics of Undoped and Eu3+-doped TbAl3(BO3)4 Crystals

Unraveling the Remarkable Influence of Square Antiprism Geometry on Highly Efficient Far‐Red Emission of Eu3+ in Borotellurate Phosphors for Versatile Utilizations

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Product

Resources

About

Design of Eu³⁺-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Design of Eu³⁺-Doped Fluoride Phosphor with Zero Thermal Quenching Property Based on Density Functional Theory

Excited State Dynamics of Undoped and Eu³⁺-doped TbAl₃(BO₃)₄ Crystals

Unraveling the Remarkable Influence of Square Antiprism Geometry on Highly Efficient Far‐Red Emission of Eu³⁺ in Borotellurate Phosphors for Versatile Utilizations