A multi-centre activated single-phase white light phosphor with high efficiency for near-UV based WLEDs

Zhang, Ziwang; Yang, Nan; Li, Zhuo; Chen, Jun; Chen, Pin; Xu, Ya‐Qiong; Shi, Jianxin; Wu, Mingmei

doi:10.1039/d3qi00685a

Cited by 35 publications

(4 citation statements)

References 48 publications

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“…The calculation models were built from the crystal structure. The optical band gap of the phosphor can be determined using the Kubelka-Munk theory, which converts the absorption spectrum of the phosphor into a function [22,23]:…”

Section: Methodsmentioning

confidence: 99%

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

Hu,

Zhang,

et al. 2024

Luminescence

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Recently, long persistent phosphors (LPPs) have attracted significant attention as promising candidates for biomedical applications. However, the serious decrease in luminescence intensity in tissue still remains a major challenge. Therefore, exploring more competitive LPPs and achieving reproducible tissue imaging is crucial. In this study, a new series of near‐infrared (NIR) phosphors La3Ga5Sn1‐xO14:xCr3+ (x = 0.005–0.05) were synthesized using a high‐temperature solid‐state method. The as‐synthesized samples were characterized using X‐ray diffraction, diffuse/photoluminescence spectroscopy, fluorescence decay curves, and thermoluminescence spectroscopy. Upon excitation with ultraviolet light, strong emission bands were observed in the range 600–1200 nm with an optimal doping concentration of x = 0.02 mol. Moreover, La3Ga5SnO14:Cr3+ exhibits persistent luminescence due to the presence of suitable energy traps, which prompted the phosphor to emit NIR light even after the removal of the excitation source.

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Section: Methodsmentioning

confidence: 99%

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

Hu,

Zhang,

et al. 2024

Luminescence

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“…However, multiple metal ions co-doping may suffer from emission overlap or energy transfer, leading to a lack of multiple emissions. [13] Fortunately, organicinorganic metal halides (OIMHs), possessing a chemical formula of A x B y X z (A = organic cation, B = metal, X = halogen), offer wide structural regulation on organic cation for tunable emission, compared with all-inorganic metal halides. [14] Additionally, halogen regulation efficiently alters the optical absorption and emission properties of OIMHs.…”

Section: Introductionmentioning

confidence: 99%

Multisite Fine‐Tuning in Hybrid Cadmium Halides Enables Wide Range Emissions for Anti‐Counterfeiting

Zhang,

Jin,

Lin

et al. 2024

Angewandte Chemie

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Achieving tunable emissions spanning the spectrum, from blue to near‐infrared (NIR) light, within a single component is a formidable challenge with significant implication, particularly in tailoring multicolor luminescence for anti‐counterfeiting purposes. In this study, we demonstrate a broad spectrum of emissions, covering blue to red and extending into NIR light in [BPy]2CdX4:xSb3+ (BPy = Butylpyridinium; X = Cl, Br; x = 0 to 0.08) through precise multisite structural fine‐tuning. Notably, the multicolor emissions from [BPy]2CdBr4:Sb3+ manifest a distinctive pattern, transitioning from blue to yellow in tandem with the host [BPy]2CdBr4 and further extending from yellow to NIR with its homologous [BPy]2CdCl4:Sb3+, resulting in the simultaneous presence of intersecting and independent emission colors. Detailed modulation of chemical composition enables partial luminescence switching, facilitating the creation of diverse patterns with multicolor luminescence by employing [BPy]2CdX4:xSb3+ as phosphors. This study for the first time successfully implements several groups of tunable emission colors in a single matrix via multisite fine‐tuning. Such an effective strategy not only develops the specific relationships between tunable emissions and adjustable compositions, but also introduces a cost‐effective and straightforward approach toachievingunique, high‐level, plentiful‐color and multiple‐information‐storage labels for advanced anti‐counterfeiting applications.

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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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A multi-centre activated single-phase white light phosphor with high efficiency for near-UV based WLEDs

Abstract: Single-phase white light phosphors for phosphor-converted white light-emitting diodes (pc-WLEDs) have become a hot spot and attracted considerable attention. However, the unsatisfactory luminous efficiency and colour rendering index of this...

Cited by 35 publications

References 48 publications

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

Multisite Fine‐Tuning in Hybrid Cadmium Halides Enables Wide Range Emissions for Anti‐Counterfeiting

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

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A multi-centre activated single-phase white light phosphor with high efficiency for near-UV based WLEDs

Abstract: Single-phase white light phosphors for phosphor-converted white light-emitting diodes (pc-WLEDs) have become a hot spot and attracted considerable attention. However, the unsatisfactory luminous efficiency and colour rendering index of this...

Cited by 35 publications

References 48 publications

Broadband near‐infrared (NIR) emitting Cr3+‐doped La3Ga5SnO14 phosphor with long persistent and photostimulated persistent luminescence

Broadband near‐infrared (NIR) emitting Cr3+‐doped La3Ga5SnO14 phosphor with long persistent and photostimulated persistent luminescence

Multisite Fine‐Tuning in Hybrid Cadmium Halides Enables Wide Range Emissions for Anti‐Counterfeiting

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

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Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

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