A new type of zero thermal quenching red emitting phosphor β-NaYF4:Eu3+ for NUV LEDs

Ling, Shaokun; Liang, Jie; Yan, Yifeng; Luo, Chaolian; Liao, Sen; Huang, Yingheng

doi:10.1016/j.jssc.2022.123099

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…Several explanations for the effect of zero thermal quenching are based on the following points. 58–61 (1) Defect energy levels commonly exist in crystals where activated electrons can be trapped and released through electron capture centers, and the energy is transferred from thermally activated defect energy levels to activated ions, resulting in compensating for the emission loss caused by the temperature increase or even boosting the emission intensity. (2) When the temperature rises, due to thermal perturbation, electrons enter the charge-transfer state (CTS), which is conducive to reducing the non-radiative transition and enhancing the emission intensity of active ions.…”

Section: Resultsmentioning

confidence: 99%

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

Yang

Shao

et al. 2023

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

Yang

Shao

et al. 2023

New J. Chem.

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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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Synthesis, luminescence properties, and thermal decomposition kinetics of NH4GdF4:Eu3+ with an intense negative thermal quenching effect

Wang,

Hou,

Wang

et al. 2024

Ceramics International

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A new type of zero thermal quenching red emitting phosphor β-NaYF4:Eu3+ for NUV LEDs

Cited by 4 publications

References 43 publications

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

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

Synthesis, luminescence properties, and thermal decomposition kinetics of NH4GdF4:Eu3+ with an intense negative thermal quenching effect

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A new type of zero thermal quenching red emitting phosphor β-NaYF4:Eu3+ for NUV LEDs

Cited by 4 publications

References 43 publications

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

Defect-induced zero thermal quenching of a bright red-emitting nonlinear optical material

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

Synthesis, luminescence properties, and thermal decomposition kinetics of NH4GdF4:Eu3+ with an intense negative thermal quenching effect

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