Tunable photoluminescence of intrinsic oxygen vacancies and Bi3+/Eu3+/Li+ tridoped BaZnOS for application in wLEDs

Luo, J.; Wu, K.T.; Yao, Z.C.; Gong, J.S.; Ni, C.Y.; Xu, M.; Dai, W.B.

doi:10.1016/j.ceramint.2023.08.231

Cited by 8 publications

(1 citation statement)

References 35 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environmental protection, long lifespan, energy saving, etc, this mode with congenital defects is also a bit outdated in the context of the new era because of the following issues: − (i) instable “cool” white photoluminescence (PL) changes with input power, (ii) low color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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Achieving Multicolor Anti‐Counterfeiting via Simultaneous X‐Ray and UV/Blue Excitation in Ca₂YMgScSi₃O₁₂: Mn²⁺

Wang,

Dai,

et al. 2024

Advanced Optical Materials

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Optical materials have attracted much attention in anti‐counterfeiting applications due to their visualization and multi‐emission modes. However, the unit occupancy predestines the material to only monochromatic emission, inhibiting the application of optical materials in advanced information encryption. Here, a green to yellow to deep‐red phosphor is reported in a Mn2+‐activated garnet compound Ca2YMgScSi3O12: Mn2+ (CYMSS: Mn2+), originating from the abundant lattice sites occupying within the crystal structure by Mn2+ ions. Three different photoluminescence (PL) emission bands peaked at 517, 576, and 720 nm from 4T1 (G) → 6A1 (S) are observed, which are attributed to the substitution of [Sc/MgO6] octahedron and [Ca/YO8] dodecahedron sites by Mn2+ ions, respectively. Hence, tunable emissions from green to deep‐red are realized in single Mn2+ doping by switching the excitation source of ultraviolet (UV)/blue and X‐ray, which can be further regulated by varying the Mn2+ concentration. Multi‐position occupying, color‐tunable light‐emitting materials offer the possibility of more advanced optical information encryption.

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Photoluminescence of ceramic Ba2Mg(PO4)2: Ce/Mn/Na/Sr phosphor: Site occupation, energy transfer, charge compensation, and alkaline-earth-metal-ions blending study

Wang,

Ni,

Lei

et al. 2024

Ceramics International

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Tunable photoluminescence of intrinsic oxygen vacancies and Bi3+/Eu3+/Li+ tridoped BaZnOS for application in wLEDs

Cited by 8 publications

References 35 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

Achieving Multicolor Anti‐Counterfeiting via Simultaneous X‐Ray and UV/Blue Excitation in Ca₂YMgScSi₃O₁₂: Mn²⁺

Photoluminescence of ceramic Ba2Mg(PO4)2: Ce/Mn/Na/Sr phosphor: Site occupation, energy transfer, charge compensation, and alkaline-earth-metal-ions blending study

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Tunable photoluminescence of intrinsic oxygen vacancies and Bi3+/Eu3+/Li+ tridoped BaZnOS for application in wLEDs

Cited by 8 publications

References 35 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

Achieving Multicolor Anti‐Counterfeiting via Simultaneous X‐Ray and UV/Blue Excitation in Ca2YMgScSi3O12: Mn2+

Photoluminescence of ceramic Ba2Mg(PO4)2: Ce/Mn/Na/Sr phosphor: Site occupation, energy transfer, charge compensation, and alkaline-earth-metal-ions blending study

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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

Achieving Multicolor Anti‐Counterfeiting via Simultaneous X‐Ray and UV/Blue Excitation in Ca₂YMgScSi₃O₁₂: Mn²⁺