Facile synthesis, novel structure, and tunable luminescence properties of K6Bi13(PO4)15:Dy3+,Eu3+ phosphors for ultraviolet converted white light-emitting diodes

Kong, Hanxiao; Jia, Guang; Zhang, Ning; Meng, Zhaoxin; Li, Huilin; Zhang, Cuimiao

doi:10.1016/j.ceramint.2023.03.065

Cited by 12 publications

(2 citation statements)

References 41 publications

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“…The electric multipole interaction can be divided into several types, and the concentration quenching mechanism can be further determined by Dexter theory lg ( I x ) = C − Q 3 lg ( x ) where C is a fixed value, I and x are the luminescence intensity and doping amount after quenching, and Q is the electrical multistage constant. When Q = 6, 8, and 10, the corresponding quenching mechanisms are dipole–dipole (d–d), dipole–quadrupole (d–q), and quadrupole–quadrupole (q–q) interactions . As shown in Figure S2, at λ em = 481 and 581 nm, the fitting slopes of log( x ) and log( I / x ) are −1.89 and −1.35, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…When Q = 6, 8, and 10, the corresponding quenching mechanisms are dipole−dipole (d−d), dipole− quadrupole (d−q), and quadrupole−quadrupole (q−q) interactions. 35 As shown in Figure S2, at λ em = 481 and 581 nm, the fitting slopes of log(x) and log(I/x) are −1.89 and −1.35, respectively. Accordingly, the Q values are 5.67 and 4.05, which are close to 6.…”

Section: Photoluminescence Propertiesmentioning

confidence: 86%

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Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Zhou,

Chen,

Jiang

et al. 2024

Inorg. Chem.

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A series of Ca 3 Al 2 Ge 3 O 12 : xDy 3+ , yEu 3+ phosphors were successfully prepared by the high-temperature solid-phase method. The phase and morphology of the phosphors were studied by means of Rietveld refinement and scanning electron microscopy. The results show that the phase is pure, and the crystal structure is the Ia3̅ d space group. In the Ca 3 Al 2 Ge 3 O 12 : xDy 3+ phosphors, using 380 nm excitation, phosphors showed blue ( 4 F 9/2 → 6 H 15/2 ) and yellow ( 4 F 9/2 → 6 H 13/2 ) emission peaks at 481 and 581 nm, respectively. In Ca 3 Al 2 Ge 3 O 12 : xDy 3+ , yEu 3+ phosphors, the energy transfer was inferred by the spectrum overlap of Dy 3+ and Eu 3+ , and the lifetime attenuation was analyzed from the perspective of dynamics; finally, the band gap structure of the phosphors was analyzed by combining diffuse reflection spectra with the first principle, and the energy transfer mechanism and luminescence mechanism were elaborated by combining theory and practice. The transition from blue white light to red light can be achieved by tuning the range of y in Ca 3 Al 2 Ge 3 O 12 : 0.015Dy 3+ , yEu 3+ . Wherein, when y = 0.07, phosphors, the chromaticity coordinate of warm white CIE is (0.3932, 0.3203), the color temperature is 3093 K, and the warm white light is synthesized. The thermal stability of the synthesized warm white phosphors is 90.1% (423 K), the thermal sensing factors are S amax = 5.51 × 10 −4 K −1 (303 K) and S rmax = 0.0359% K −1 (303 K), and the actual quantum efficiency is IQE = 52.48%. These results prove that Ca 3 Al 2 Ge 3 O 12 : Dy 3+ , Eu 3+ have good application prospects as singlecomponent warm w-LED devices.

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Section: Resultsmentioning

confidence: 99%

Section: Photoluminescence Propertiesmentioning

confidence: 86%

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Zhou,

Chen,

Jiang

et al. 2024

Inorg. Chem.

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Achieving the Anomalous Far‐Red Emission of Eu³⁺ by Tailoring Distorted Square Antiprism Symmetry in Potassium‐Bismuth‐Phosphates

Zhang,

Yang,

et al. 2024

Laser & Photonics Reviews

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Eu3+ doped phosphors with efficient and intense 5D0‐7F4 far‐red luminescence hold significant potential in daily and agricultural illuminations. However, Eu3+ ions typically emit orange/red luminescence from 5D0‐7F1,2 transitions, and the development of high‐quality Eu3+ doped far‐red phosphors is still lacking and challenging. Herein, two potassium‐bismuth‐phosphate phosphors are developed to manipulate the coordination geometry from octahedron to distorted square antiprism, achieving intense 5D0‐7F4 far‐red emission with a high quantum efficiency of 90.5%. Specifically, formation energy calculations and transient spectral measurements reveal that Eu3+ occupies distorted square antiprism symmetric site in K6Bi13(PO4)15:Eu3+, resulting in intense 5D0‐7F4 far‐red emission. Conversely, the octahedral symmetry generates weak 5D0‐7F4 emission in K5Bi(P2O7)2:Eu3+. Moreover, K6Bi13(PO4)15:0.08Eu3+ (90%@423 K) exhibits better thermal stability compared to K5Bi(P2O7)2:0.2Eu3+ (83%@423 K). Spectral analyses and Debye temperature calculations exclude contributions from charge transfer band and structural rigidity, and elevated thermal stability is attributed to suppressed energy migration to quenching centers facilitated by smaller Eu3+ doping level in K6Bi13(PO4)15:0.08Eu3+. Finally, excellent photoelectric properties of white‐LEDs and plant growth lighting by utilizing the representative K6Bi13(PO4)15:0.08Eu3+ as red/far‐red components indicate its application potentiality. This work provides a feasible method for constructing efficient Eu3+ doped far‐red phosphors.

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Investigation on Luminescence Properties of Dy3+ Ions Doped NaBaB9O15 Phosphors for Optoelectronic Applications

Parthibaraj,

Vijayakumar,

Padhi

et al. 2024

J Fluoresc

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Facile synthesis, novel structure, and tunable luminescence properties of K6Bi13(PO4)15:Dy3+,Eu3+ phosphors for ultraviolet converted white light-emitting diodes

Cited by 12 publications

References 41 publications

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Achieving the Anomalous Far‐Red Emission of Eu³⁺ by Tailoring Distorted Square Antiprism Symmetry in Potassium‐Bismuth‐Phosphates

Investigation on Luminescence Properties of Dy3+ Ions Doped NaBaB9O15 Phosphors for Optoelectronic Applications

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Facile synthesis, novel structure, and tunable luminescence properties of K6Bi13(PO4)15:Dy3+,Eu3+ phosphors for ultraviolet converted white light-emitting diodes

Cited by 12 publications

References 41 publications

Garnet Structure-Activated Warm White Light Phosphors Ca3Al2Ge3O12: Dy3+, Eu3+ with Ultrahigh Thermal Stability and Tunable Luminescence

Garnet Structure-Activated Warm White Light Phosphors Ca3Al2Ge3O12: Dy3+, Eu3+ with Ultrahigh Thermal Stability and Tunable Luminescence

Achieving the Anomalous Far‐Red Emission of Eu3+ by Tailoring Distorted Square Antiprism Symmetry in Potassium‐Bismuth‐Phosphates

Investigation on Luminescence Properties of Dy3+ Ions Doped NaBaB9O15 Phosphors for Optoelectronic Applications

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Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Achieving the Anomalous Far‐Red Emission of Eu³⁺ by Tailoring Distorted Square Antiprism Symmetry in Potassium‐Bismuth‐Phosphates