Cation vacancy repair for the enhancement of orange-yellow luminescence in Sr9Mg1.5−xKx(PO4)7:Eu2+ phosphors

Yu, Liping; Yan, Huifang; Fan, Y.; Zhang, Jinhui; Ma, Zhongyun; Zhou, Wenli; Chen, Yan; Pan, Fengjuan; Lian, Shixun

doi:10.1039/c8tc01756e

Cited by 43 publications

(33 citation statements)

References 42 publications

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“…The lifetime of C 14− x AZ 6− y O: Mn 4+ phosphor is enhanced by the construction of Ca 2+ and Zn 2+ vacancies, which corresponds to the change trend of luminescence intensity. It can be further proved that the luminous intensity is enhanced due to the charge compensation mechanism by reducing the possibility of non‐radioactive energy transition among Mn 4+ …”

Section: Resultsmentioning

confidence: 98%

“…The above evidences suggest that engineering Ca 2+ or Zn 2+ vacancies can improve the luminescence intensity of C 14− x AZ 6− y O: Mn 4+ phosphors. As for the factors, engineering cation vacancies can reduce the negative effects of the charge imbalance and then enhance the luminescence intensity of C 14− x AZ 6− y O: Mn 4+ phosphors …”

Section: Resultsmentioning

confidence: 99%

“…As for the factors, engineering cation vacancies can reduce the negative effects of the charge imbalance and then enhance the luminescence intensity of C 14−x AZ 6−y O: Mn 4+ phosphors. 27 The luminescence kinetic behavior of phosphors can be directly reflected by the fluorescence lifetime decay curves. In Figure 5, the decay curves are given for CAZO: 0.15Mn 4+ , CAZ 5.7 O: 0.15Mn 4+ , C 13.7 AZO: 0.15Mn 4+ samples monitored at 715 nm and excited at 470 nm under room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Whereas, in Ca 14 Al 10 Zn 6 O 35 : Mn 4+ phosphors, replacing Al 3+ with Mn 4+ will lead to the charge imbalance, which will have negative effects on the luminescence properties. According to the previous report, there are many ways to balance charge, among which the vacancy engineering is an effective method to enhance the luminescence intensity of phosphors . Therefore, we tend to improve the optical properties in Ca 14 Al 10 Zn 6 O 35 : Mn 4+ phosphors by engineering Ca 2+ and Zn 2+ vacancies based on the charge compensation mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…According to the previous report, there are many ways to balance charge, [24][25][26] among which the vacancy engineering is an effective method to enhance the luminescence intensity of phosphors. 27 Therefore, we tend to improve the optical properties in Ca 14 Al 10 Zn 6 O 35 : Mn 4+ phosphors by engineering Ca 2+ and Zn 2+ vacancies based on the charge compensation mechanism.…”

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confidence: 99%

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Engineering cation vacancies to improve the luminescence properties of Ca₁₄Al₁₀Zn₆O₃₅: Mn⁴⁺ phosphors for LED plant lamp

et al. 2019

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In the recent years, Mn4+‐doped phosphors for indoor plant cultivation have received extensive concern owing to the far‐red emission that can match well with the absorption spectra of plant pigments. Whereas, many Mn4+‐doped phosphors still face some challenges such as poor light efficiency and low thermal stability. It is an effective way to resolve these problems via cation vacancies engineering. Herein, the Ca14−xAl10Zn6−yO35: Mn4+ phosphors are successfully synthesized by combustion method. The luminescence intensity of Ca14−xAl10Zn6−yO35: Mn4+ phosphor is enhanced through engineering Ca2+ and Zn2+ vacancies according to the charge compensation mechanism. The optimal content of each Ca2+ and Zn2+ vacancy is equal to be 0.3. Furthermore, the defect formation is accompanied with lattice distortion, which plays a vital role in driving the excited phonon traps to reduce the energy loss by non‐radiation transitions. Therefore, the thermal stability of Ca14−xAl10Zn6−yO35: Mn4+ phosphor is also improved via engineering cation vacancies. In addition, the Ca14−xAl10Zn6−yO35: Mn4+ phosphors can be effectively excited by blue light and it exhibits far‐red emission due to the Mn4+ spin‐forbidden 2E → 4A2 transition. The results suggest that the Ca14−xAl10Zn6−yO35: Mn4+ phosphors can have a tremendous potential in indoor plant cultivation.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Engineering cation vacancies to improve the luminescence properties of Ca₁₄Al₁₀Zn₆O₃₅: Mn⁴⁺ phosphors for LED plant lamp

et al. 2019

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Eu(II)‐Activated Silicates for UV Light‐Emitting Diodes Tuning into Warm White Light

et al. 2020

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White‐light‐emitting diodes (WLEDs) are the main white light source for general lighting due to high‐luminous efficacy (>150 lm W−1), long lifespan (5 × 104 h), and environmentally friendly properties. Despite the current maturity and reliability of the solid state‐lighting field, the control of the correlated color temperature (CCT) tuning is still a challenge, arising from the lack of red emission color in the current design of commercial WLEDs. Moreover, as this aspect is often associated with dysregulations of the human circadian rhythm, the need for novel WLEDs is of enlarged societal relevance. In this scope, herein, warm WLED prototypes are fabricated by coating near‐UV‐emitting LEDs with a mixture of the yellow‐emitting polyphasic Sr2SiO4:Eu(II) (S2S) and the blue‐emitting BaMgAl10O17:Eu(II) (BAM) phosphors dispersed in poly(methyl methacrylate). As the amount of S2S increases in the phosphor mixture, the CCT values of the WLEDs decrease from 6500 K (ideal for daylight application) to 4000 K (ideal for night light application), with a luminous efficacy of radiation of 404 lm W−1, among the best figures of merit for WLEDs. Furthermore, all the WLED devices also display a desirable color rendering index (CRI > 75), comparable with the commercial WLED, independent on the operating voltage.

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Novel Double Light‐Color (Blue and Red) Phosphor Sr₉Ca(Li, Na, K)(PO₄)₇:Eu²⁺ Excited By NUV Light for Outdoor Plant Cultivation

Yang,

Liu,

Wang

et al. 2024

Adv Materials Technologies

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Through the conventional high‐temperature state reaction, a series of Sr9Ca(Li, Na, K)(PO4)7:Eu2+ phosphors are successfully synthesized. The luminescence of these phosphors can be bifurcated into two distinct regions: blue and red. Upon calculation of their Stokes shifts and comparison of their magnitudes, it is inferred that the blue and red emissions are triggered by the integration of Eu2+ into the Ca2+ and Sr2+ sites, respectively. The disorder of Sr9Ca1.5(PO4)7 phosphors in which Ca2+ is substituted by Li+, Na+, and K+ ions is confirmed by Raman spectroscopy. Among the synthesized phosphors, Sr9CaNa(PO4)7:0.03Eu2+ demonstrates an emission that aligns with the spectral range required for plant growth, suggesting its potential application in plant cultivation. An exploration is carried out to assess the impact of a light‐conversion film, which is fabricated by embedding the phosphor within the PDMS matrix. The study focuses on Chlorella, a unicellular algal species, to determine the enhancement in growth rates attributable to the light‐conversion properties of the film. Chlorella cultures subject to placement of a film containing 5% phosphor exhibited a 9.21% improvement in growth over those placed on a whiteboard, and a 27.69% increase relative to the control group. These results suggest that the light‐conversion film substantially benefits the proliferation of Chlorella.

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Cation vacancy repair for the enhancement of orange-yellow luminescence in Sr₉Mg_1.5−xK_x(PO₄)₇:Eu²⁺ phosphors

Abstract: A cation vacancy repair strategy successfully improves the photoluminescence of the Sr9Mg1.5(PO4)7:Eu2+ phosphor by K substituting Mg and Mg-vacancies.

Cited by 43 publications

References 42 publications

Engineering cation vacancies to improve the luminescence properties of Ca₁₄Al₁₀Zn₆O₃₅: Mn⁴⁺ phosphors for LED plant lamp

Engineering cation vacancies to improve the luminescence properties of Ca₁₄Al₁₀Zn₆O₃₅: Mn⁴⁺ phosphors for LED plant lamp

Eu(II)‐Activated Silicates for UV Light‐Emitting Diodes Tuning into Warm White Light

Novel Double Light‐Color (Blue and Red) Phosphor Sr₉Ca(Li, Na, K)(PO₄)₇:Eu²⁺ Excited By NUV Light for Outdoor Plant Cultivation

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Cation vacancy repair for the enhancement of orange-yellow luminescence in Sr9Mg1.5−xKx(PO4)7:Eu2+ phosphors

Abstract: A cation vacancy repair strategy successfully improves the photoluminescence of the Sr9Mg1.5(PO4)7:Eu2+ phosphor by K substituting Mg and Mg-vacancies.

Cited by 43 publications

References 42 publications

Engineering cation vacancies to improve the luminescence properties of Ca14Al10Zn6O35: Mn4+ phosphors for LED plant lamp

Engineering cation vacancies to improve the luminescence properties of Ca14Al10Zn6O35: Mn4+ phosphors for LED plant lamp

Eu(II)‐Activated Silicates for UV Light‐Emitting Diodes Tuning into Warm White Light

Novel Double Light‐Color (Blue and Red) Phosphor Sr9Ca(Li, Na, K)(PO4)7:Eu2+ Excited By NUV Light for Outdoor Plant Cultivation

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Product

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Cation vacancy repair for the enhancement of orange-yellow luminescence in Sr₉Mg_1.5−xK_x(PO₄)₇:Eu²⁺ phosphors

Engineering cation vacancies to improve the luminescence properties of Ca₁₄Al₁₀Zn₆O₃₅: Mn⁴⁺ phosphors for LED plant lamp

Engineering cation vacancies to improve the luminescence properties of Ca₁₄Al₁₀Zn₆O₃₅: Mn⁴⁺ phosphors for LED plant lamp

Novel Double Light‐Color (Blue and Red) Phosphor Sr₉Ca(Li, Na, K)(PO₄)₇:Eu²⁺ Excited By NUV Light for Outdoor Plant Cultivation