Photoluminescent properties of Eu-doped MAl2Si2O8 aluminosilicates phosphors

Dai, Wubin; Zhou, Jia; Zhang, Z.H.; Wang, S.L.; Xu, Man

doi:10.1016/j.jallcom.2018.06.260

Cited by 17 publications

(4 citation statements)

References 24 publications

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“…The phosphor obtained via the solid-phase reaction exhibits irregularly shaped particles with sizes several microns in diameter (Figure a). This morphology is helpful for application in the SSL as it can realize high packing density and low light scattering losses. − EDS is also performed to examine the presence of elements and their distributions (Figure b), where it confirms that the phosphor is exclusively made up of the elements Ca, Y, Ga, B, Dy, Sm, La, and O. Importantly, these elements are distributed uniformly across the entire particle without aggregation and phase separation.…”

Section: Resultsmentioning

confidence: 93%

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: Resultsmentioning

confidence: 93%

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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“…4c). In order to clarity its source, the crystal field strength ( D q ) of each site could be considered qualitatively via eqn (5): D q = Ze 2 r 4 /6 R 5 ,in which the Z , e , r and R are the anion charge, electron charge, the radius of the d wave function and the bond length, 32 respectively. Clearly, D q is inversely proportional to R under the same condition.…”

Section: Resultsmentioning

confidence: 99%

“…in which the Z, e, r and R are the anion charge, electron charge, the radius of the d wave function and the bond length, 32 respectively. Clearly, D q is inversely proportional to R under the same condition.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Stable color-tunable Ca₃Y(GaO)₃(BO₃)₄:Bi³⁺/Tb³⁺/Eu³⁺ phosphors for application in n-UV-pumped wLEDs

Xia,

Zheng,

Yue

et al. 2024

Dalton Trans.

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“…In particular, the special rigid structure facilitates self-reduction and allows the coexistence of heterovalent Eu 2+/3+ , e.g., Lu 2 MgA l4 SiO 12 :Eu 2+/3+ , CaBPO 5 :Eu 2+/3+ , Ba 5 SiO 4 C l6 :Eu 2+/3+ , Ca 12 Al 14 O 32 F 2 :Eu 2+/3+ , and MAl 2 Si 2 O 8 :Eu 2+/3+ . Numerous authors have suggested that the host alkaline vacancies are the primary electron source for the self-reduction of Eu 3+ . , Pan et al used an antidefect engineering strategy by introducing alkali metals to remove vacancy defects to develop high-efficiency phosphors . Han et al reported defect-induced self-activated Ba 3 BPO 7 phosphor luminescence properties and a possible mechanism .…”

Section: Introductionmentioning

confidence: 99%

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Wang,

Su,

Mei

et al. 2023

Inorg. Chem.

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The self-reduction mechanism in pyrophosphate phosphors is currently explained through nonequivalent substitution for charge compensation. Nevertheless, the impact of oxygen vacancies on the self-reduction enhancement requires further investigation. Herein, heterovalent Ba1–x Zn1–y P2O7:xEu2+/3+, yMg phosphors with rigid structures were prepared through conventional solid-phase technology in air. The cation substitution strategy leads to different chemistry electronegativity and adjustable crystal field environments and creates vacancy defects. Crystal structure and component analysis indicate the gradual phase segregation change from BaZnP2O7 to BaMgP2O7 with increasing Mg2+ content. The CIE coordinates that are tuned from (0.514, 0.334) to (0.326, 0.152) and realize color-tunable emission from red-orange to blue-violet can be used as multicolor functional materials. Besides, the phosphor demonstrates its maximum S a of 0.4725% K–1 (498 K) and S r of 1.376% K–1 (423 K). These results demonstrate that the phosphors have the potential for contactless optical temperature measurement and anticounterfeiting. This work not only investigates the self-reduction of the Eu3+ → Eu2+ phenomenon but also provides a supplementary explanation and data support to complete the effect of the oxygen vacancy on self-reduction.

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Photoluminescent properties of Eu-doped MAl2Si2O8 aluminosilicates phosphors

Cited by 17 publications

References 24 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

Stable color-tunable Ca₃Y(GaO)₃(BO₃)₄:Bi³⁺/Tb³⁺/Eu³⁺ phosphors for application in n-UV-pumped wLEDs

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

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Photoluminescent properties of Eu-doped MAl2Si2O8 aluminosilicates phosphors

Cited by 17 publications

References 24 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

Stable color-tunable Ca3Y(GaO)3(BO3)4:Bi3+/Tb3+/Eu3+ phosphors for application in n-UV-pumped wLEDs

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

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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

Stable color-tunable Ca₃Y(GaO)₃(BO₃)₄:Bi³⁺/Tb³⁺/Eu³⁺ phosphors for application in n-UV-pumped wLEDs