Spectral tunability of K2Lu(WO4)(PO4): Dy3+, Eu3+ phosphors and remote luminescent layers for high-quality white light

Zhao, Herui; Zhang, Yanjie; Yang, Shiwei; Ye, Chunwen; He, Cong; Song, Yaqi; Wang, Yuxin; Lin, Bojun; Yu, Jingjie

doi:10.1016/j.ceramint.2023.12.178

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…Till now, the mainstream on the market of the fourth generation of the solid-state lighting (SSL) source is the phosphor-converted white light-emitting-diodes (pc- w LEDs), fabricated by the combination of yellow phosphor YAG: Ce ((Y 1– x Gd x ) 3 (Al 1– y Ga y ) 5 O 12 : Ce 3+ ) and a blue GaN-based LED chip. − Although in this way it gives huge reformation on illumination to potentially substitute for the conventional and high-energy consuming incandescent/fluorescence lamps owing to its good merits of high efficiency, environmental protection, long lifespan, energy saving, etc, this mode with congenital defects is also a bit outdated in the context of the new era because of the following issues: − (i) instable “cool” white photoluminescence (PL) changes with input power, (ii) low color rendering index (CRI), and high color correlated temperature (CCT) with low reproducibility due to strong dependence of the amount of yellow phosphor used and the two blue/yellow colors mixing, and (iii) excessive blue light from the LED chip could damage the human eyes. Therefore, further in-depth research to obtain better solutions in the field of pc- w LEDs for actual and large-scale implementation is currently a hot topic of study.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca₃Y(GaO)₃(BO₃)₄: Dy³⁺/Sm³⁺/La³⁺ for n-UV wLEDs

Xia,

Li,

et al. 2024

Crystal Growth & Design

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In the process of studying newfangled phosphor-converted white-light-emitting diodes (pc-wLEDs), some basic and important objectives of phosphor, i.e., high chemical/thermal stability, color rendering index (CRI), and low correlated color temperature (CCT), should pass muster simultaneously. Herein, for the first time, a series of photoluminescence (PL) color-tunable single-phase Ca3Y(GaO)3(BO3)4: Dy3+/Sm3+/La3+ (CYGB: Dy/Sm/La) phosphors with good dispersivity, crystallinity, and size uniformity have been designed and synthesized via a facile solid-state reaction method. Structurally, based on XRD and Rietveld refinements, the tendentious occupations of Dy/Sm/La on the Y3+ site with a 9-coordinated number (CN) over other cationic sites are in line with the facts that the ionic radius and charge difference of Dy/Sm/La are much closer to Y3+ in 9-CN than Y3+ in 7-CN and Ca2+ in both 9- and 7-CN. Spectrally, thanks to the “cool” white PL from 4f–4f transitions of Dy and red-emitting from Sm, polychromatic PL including “warm” white light with high efficiency could be realized in CYGB: Dy/Sm via the regulation of doping content and energy transfer (ET). Intriguingly, the “abnormal” phenomena of zero-thermal-quenching in the range from room temperature (RT) to 573 K were observed, probably owing to the synergistic effects of electron–phonon coupling, ET, and structural defects. Moreover, by tridoping La3+ to legitimately adjust the site environments, the PL of both Dy/Sm could be further tuned because they all include hypersensitive transitions that are closely related to the crystal field environment. Finally, as a proof-of-concept fabrication, the pc-wLED assembled by a combination of the composition-optimized CYGB: Dy/Sm/La and an n-UV LED chip via remote “capping” packaging shows attractive performances, indicating its potential as an efficient phosphor for n-UV wLEDs.

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Section: Introductionmentioning

confidence: 99%

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca₃Y(GaO)₃(BO₃)₄: Dy³⁺/Sm³⁺/La³⁺ for n-UV wLEDs

Xia,

Li,

et al. 2024

Crystal Growth & Design

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Structural and Photoluminescence Characteristics of a Novel Single‐Phase White‐Emitting Phosphor SrBi₂Nb₂O₉:Dy³⁺

Yang,

Cui,

Zhang

et al. 2024

Physica Status Solidi (b)

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A group of white light‐emitting phosphors SrBi2Nb2O9:xDy3+ (SBN:xDy3+) are prepared by high‐temperature solid reaction. The crystal phase, morphology, and photoluminescence (PL) characteristics of the prepared SBN:xDy3+ are analyzed. The X‐ray diffraction results prove that the synthesized samples are pure phase, in which the shift of the main peak depicted that crystal interplanar distance decreases after Dy3+ replacing Bi3+. The scanning electron microscope results show that the average crystal size of the sample is ≈1–10 μm. Energy dispersive X‐ray spectroscopy shows that the ratio of element composition of the SBN:xDy3+ is similar to the theoretical calculation. The PL excitation illustrates the excitation peaks mainly exist at 389, 399, 426, and 450 nm due to the transitions of Dy3+. For PL, the emission peaks of samples with different doping concentrations are centered at 479 and 573 nm. The ratio of yellow intensity to blue intensity indicates that Dy3+ is located at a high symmetry site, which has the possibility to produce suitable white light. The Commission Internationale de l’Eclairage coordinates of the SBN:xDy3+ are located near the standard white light coordinate. All these results prove that SrBi2Nb2O9:xDy3+ can be a potential material in the white light application.

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Warm white light phosphors Sc2W3O12: Dy3+, Eu3+ with ultrahigh thermal stability and tunable luminescence

Pei,

Yan,

Liu

et al. 2025

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Spectral tunability of K2Lu(WO4)(PO4): Dy3+, Eu3+ phosphors and remote luminescent layers for high-quality white light

Cited by 5 publications

References 34 publications

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca₃Y(GaO)₃(BO₃)₄: Dy³⁺/Sm³⁺/La³⁺ for n-UV wLEDs

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca₃Y(GaO)₃(BO₃)₄: Dy³⁺/Sm³⁺/La³⁺ for n-UV wLEDs

Structural and Photoluminescence Characteristics of a Novel Single‐Phase White‐Emitting Phosphor SrBi₂Nb₂O₉:Dy³⁺

Warm white light phosphors Sc2W3O12: Dy3+, Eu3+ with ultrahigh thermal stability and tunable luminescence

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Spectral tunability of K2Lu(WO4)(PO4): Dy3+, Eu3+ phosphors and remote luminescent layers for high-quality white light

Cited by 5 publications

References 34 publications

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca3Y(GaO)3(BO3)4: Dy3+/Sm3+/La3+ for n-UV wLEDs

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca3Y(GaO)3(BO3)4: Dy3+/Sm3+/La3+ for n-UV wLEDs

Structural and Photoluminescence Characteristics of a Novel Single‐Phase White‐Emitting Phosphor SrBi2Nb2O9:Dy3+

Warm white light phosphors Sc2W3O12: Dy3+, Eu3+ with ultrahigh thermal stability and tunable luminescence

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Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca₃Y(GaO)₃(BO₃)₄: Dy³⁺/Sm³⁺/La³⁺ for n-UV wLEDs

Crystal Structure, Photoluminescence, and “Abnormal” High Stability of Ca₃Y(GaO)₃(BO₃)₄: Dy³⁺/Sm³⁺/La³⁺ for n-UV wLEDs

Structural and Photoluminescence Characteristics of a Novel Single‐Phase White‐Emitting Phosphor SrBi₂Nb₂O₉:Dy³⁺