Novel luminescence enhancement and splitting of excitation and emission bands of Na2SiF6:Mn4+,Li+ phosphors induced by Li+ co-doping

Liu, Youmiao; Li, Yuelan; Meng, Jianming; Liang, Weifeng; Huang, Wenjing; Liao, Sen; Huang, Yingheng; Zhang, Huaxin

doi:10.1016/j.jlumin.2019.116770

Cited by 23 publications

(13 citation statements)

References 52 publications

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“…Although the cation exchange method has been shown to be efficient in doping Mn 4+ into the microsized fluoride powder hosts, 28,38 the same way to dope Mn 4+ into the millimetersized fluoride single crystals is not a plain sailing. After immersing the Na 2 SiF 6 crystals into the K 2 MnF 6 -contained HF solution for longer than 10 min, red luminescence from the solids can be gradually observed under 365 nm UV irradiation (Video S1).…”

Section: Resultsmentioning

confidence: 99%

“…The K 2 TiF 6 powder was mixed with a small volume of HF solution dissolved with K 2 MnF 6 , and after stirring for 20 min, K 2 TiF 6 :Mn 4+ with uniform distribution of Mn 4+ and size of tens of microns were obtained. In 2020, Zhang et al 28 used the cation exchange method to synthesize the Na 2 SiF 6 :Mn 4+ phosphor (particle size, ~1 μm). We thus also attempt to employ this method to dope Mn 4+ into the Na 2 SiF 6 single crystals.…”

Section: Resultsmentioning

confidence: 99%

“…Among the so‐far reported fluorides, the Mn 4+ 2 E g → 4 A 2 g transition in Na 2 SiF 6 emits the shortest wavelength peaking at 627 nm with an intense zero phonon line (ZPL) emission 24 . To date, there are 12 reports on Na 2 SiF 6 :Mn 4+ and its derivates (such as KNaSiF 6 :Mn 4+ ) 25‐36 . However, the growth of single‐crystal Na 2 SiF 6 :Mn 4+ has not reported yet.…”

Section: Introductionmentioning

confidence: 99%

“…24 To date, there are 12 reports on Na 2 SiF 6 :Mn 4+ and its derivates (such as KNaSiF 6 :Mn 4+ ). [25][26][27][28][29][30][31][32][33][34][35][36] (30.0%−32.0% solution, GR, Aladdin) were used as raw chemicals. A quasi-saturated Na 2 SiF 6 transparent solution (0.10 mol/L, 80 ml) was prepared in a plastic centrifugal tube (100 ml) by dissolving one of the sodium-bearing precursors with H 2 SiF 6 at 90°C (water bath) and held at this temperature for 10 min.…”

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confidence: 99%

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Solution growth of millimeter‐scale Na₂SiF₆ single crystals for Mn⁴⁺‐doping as red phosphor

Wang

Zhang

et al. 2021

J Am Ceram Soc

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Nowadays, the phosphor-converted white light-emitting diodes (LEDs) are pursuing better color rendering and lower correlated color temperature, by adding a red-emitting phosphor into the "blue LED + yellow-emitting garnet phosphor" system. Both Eu 2+ and Mn 4+ have been utilized as the blueto-red converting ions. Typically, the CaAlSiN 3 :Eu 2+ and (Ca, Sr) 2 Si 5 N 8 :Eu 2+ nitrides and the K 2 SiF 6 :Mn 4+ fluoride have been commercially employed in white LEDs for indoor lighting and wide-gamut displays. 1,2 The red phosphors activated by Mn 4+ show advantage over those activated by Eu 2+

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Solution growth of millimeter‐scale Na₂SiF₆ single crystals for Mn⁴⁺‐doping as red phosphor

Wang

Zhang

et al. 2021

J Am Ceram Soc

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“…Among them, antimonite with a double perovskite structure can serve as a candidate host because of appropriate physical and chemical stability. Alkali metal ions (Li + , Na + , and K + ) as appropriate flux or charge compensators can enhance the luminous efficiency of phosphors 17–20 . In this article, a series of far‐red‐emitting SISO: x Mn 4+ , M (M = Li + , Na + , and K + ) phosphors with a good luminescence performance were synthesized.…”

Section: Introductionmentioning

confidence: 99%

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

et al. 2021

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High‐efficiency and far‐red light phosphors based on Mn4+‐doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+‐doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+‐activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far‐red‐emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn4+ samples showed a far‐red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far‐red‐phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn4+ and SISO:0.006Mn4+, 0.006Li+ phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors‐based plant growth light‐emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.

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Analysis of Optical Temperature Sensing Performance of Alkali Metal Doped Na_0.5Gd_0.5TiO₃: Yb, Er Based on Judd‐Ofelt Theory and First Principles Calculations

Yuan,

Wang,

Tang

et al. 2024

Advanced Optical Materials

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In alkali metal‐doped optical temperature measurement materials, the influence of the electronegativity difference of alkali metal ions on optical temperature measurement performance is rarely reported. This study investigates and analyzes the performance of optical temperature measurement of Na0.5Gd0.5TiO3: Yb, Er doped with Li+ and K+ ions, utilizing the Judd‐Ofelt theory and the first‐principles method. The results reveal that the sensitivities increase with the increase of atomic number of doped alkali metal ions. The reason is that a difference in ionic radius between the dopant and the replaced ion decreases the symmetry of the crystal field and increases the value of Ω2. The doping K+ with low electronegativity leads to an increase in the s orbital electron density of rare earth ions, thereby repelling the d orbital electrons, reducing the d electron density, and decreasing the value of Ω6. Based on the Judd‐Ofelt theory, a combination of a large Ω2 and a small Ω6 is expected to enhance the absolute sensitivity of optical temperature‐measuring materials doped with rare earth ions. Therefore, it can be concluded that doping an ion with low electronegativity and a significant radius difference from the substitution site is beneficial for enhancing the optical temperature sensitivity.

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Novel luminescence enhancement and splitting of excitation and emission bands of Na2SiF6:Mn4+,Li+ phosphors induced by Li+ co-doping

Cited by 23 publications

References 52 publications

Solution growth of millimeter‐scale Na₂SiF₆ single crystals for Mn⁴⁺‐doping as red phosphor

Solution growth of millimeter‐scale Na₂SiF₆ single crystals for Mn⁴⁺‐doping as red phosphor

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

Analysis of Optical Temperature Sensing Performance of Alkali Metal Doped Na_0.5Gd_0.5TiO₃: Yb, Er Based on Judd‐Ofelt Theory and First Principles Calculations

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Novel luminescence enhancement and splitting of excitation and emission bands of Na2SiF6:Mn4+,Li+ phosphors induced by Li+ co-doping

Cited by 23 publications

References 52 publications

Solution growth of millimeter‐scale Na2SiF6 single crystals for Mn4+‐doping as red phosphor

Solution growth of millimeter‐scale Na2SiF6 single crystals for Mn4+‐doping as red phosphor

An efficient far‐red emission Sr2InSbO6:Mn4+, M (M = Li+, Na+, and K+) phosphors for plant cultivation LEDs

Analysis of Optical Temperature Sensing Performance of Alkali Metal Doped Na0.5Gd0.5TiO3: Yb, Er Based on Judd‐Ofelt Theory and First Principles Calculations

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Product

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Solution growth of millimeter‐scale Na₂SiF₆ single crystals for Mn⁴⁺‐doping as red phosphor

Solution growth of millimeter‐scale Na₂SiF₆ single crystals for Mn⁴⁺‐doping as red phosphor

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

Analysis of Optical Temperature Sensing Performance of Alkali Metal Doped Na_0.5Gd_0.5TiO₃: Yb, Er Based on Judd‐Ofelt Theory and First Principles Calculations