The electronic and optical properties of a narrow-band red-emitting nanophosphor K2NaGaF6:Mn4+for warm white light-emitting diodes

Jiang, Chunyan; Brik, M.G.; Li, Lihua; Li, Liyi; Peng, J.; Wu, Jianan; Мolokeev, Maxim S.; Wong, Ka Leung; Peng, Mingying

doi:10.1039/c7tc05098d

Cited by 80 publications

(41 citation statements)

References 52 publications

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“…It is known that the temperature of LED chips could reach to approximately 150°C, thus, the thermal stability plays an important role for phosphor used in LED devices . Temperature‐dependent PL spectra of SrLaGaO 4 :Mn 4+ at 298‐473 K were recorded as shown in Figure A.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO₄:Mn⁴⁺

et al. 2018

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A novel Mn4+‐doped strontium lanthanum gallate red phosphor SrLaGaO4:Mn4+ has been successfully prepared via the conventional solid‐state reaction method. Phase purity, photoluminescence excitation/emission spectra, concentration quenching, decay curves, and temperature‐dependent photoluminescence have been investigated systematically. SrLaGaO4:Mn4+ phosphor exhibits broad excitation band from 250 to 600 nm and emits intense red light centered at 716 nm arising from spin‐forbidden transition, 2E → 4A2 of Mn4+. The optimal dopant concentration of Mn4+ is determined to be 0.2 mol%. Dipole‐dipole interaction is supposed to be the mechanism of concentration quenching. The crystal‐field strength Dq, the Racah parameters B and C, and the nephelauxetic ratio β1 of SrLaGaO4:Mn4+ have been calculated according to its luminescent spectra. Our systematic investigation on this new phosphor can provide a reference for the development of red‐emitting phosphor.

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Section: Resultsmentioning

confidence: 99%

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO₄:Mn⁴⁺

et al. 2018

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“…Therefore, it is possible to use these materials in many optical applications, because these additional energy levels within the band gap substantially modify the host's optical properties. To give just a few examples, we mention recent publications uncovering the potential of the K 2 LiAlF 6 2 or K 2 NaGaF 6 11 elpasolites doped with Mn 4+ for the red phosphors and Cs 2 LiLaBr 6 :Ce 3+ for the scintillation applications 3 . Another neat elpasolite, Cs 2 NaLaI 6 , was reported to have a high light yield, up to 60 000 photons/MeV, showing very high potential for scintillating 12 …”

Section: Introductionmentioning

confidence: 99%

Effects of chemical composition on the structural stability, elastic, vibrational, and electronic properties of Cs₂NaLnX₆ (Ln = La…Lu, X = F, Cl, Br, I) elpasolites

Yang

Yan

et al. 2020

J. Am. Ceram. Soc.

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Elpasolite crystals are very important materials, both from the applied and fundamental points of view. Those elpasolites, which contain rare earth ions with a high atomic number Z, are very much suitable for the low-cost high-performance gamma-ray detection, applications in medicine, food industry, nuclear energy production, processing, and detection of nuclear proliferation. The thermal and structural stabilities are important parameters required for detecting applications, because the performance conditions for such devices are usually very harsh. Since it is widely believed that elpasolites may have even better detection properties, the lack of systematic studies on the elpasolites and thus the unavailability of reliable data on their physical properties and trends in their variation caused by chemical composition considerably hinders search for more efficient new materials. Therefore, to fill in this gap and provide with all essential information about a large number of elpasolites crystals, for the first time, the structural stability, elastic, vibrational, and electronic properties of 60 cubic elpasolite Cs 2 NaLnX 6 (Ln = La, …, Lu, X = F, Cl, Br, I) crystals were consistently calculated in the framework of the same computational approach based on the density functional theory (DFT). Variation of all calculated parameters (such as the lattice constants, elastic constants, Debye temperature, normal vibrational modes frequencies, Mulliken effective charges, bond populations, and band gaps) across the considered groups of crystals was analyzed and several trends, which are important 1490 | WU et al.

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“…Nevertheless, the Eu 2+ ‐doped phosphors are further hindered for indoor plant growth because rare‐earth materials are expensive and the far‐red region in the spectra is insufficient . Alternatively, Mn 4+ with 3d 3 electronic configurations can be excited effectively by blue light and exhibit far‐red emitting due to the spin‐forbidden 2 E → 4 A 2 transition . Many researches on Mn 4+ ‐doped phosphors mainly focus on fluorides and oxides.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] Alternatively, Mn 4+ with 3d 3 electronic configurations can be excited effectively by blue light and exhibit far-red emitting due to the spin-forbidden 2 E → 4 A 2 transition. [13][14][15][16][17][18] Many researches on Mn 4+ -doped phosphors mainly focus on fluorides and oxides. Unfortunately, the development of the Mn 4+ -doped fluoride phosphors are limited in practical application.…”

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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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The electronic and optical properties of a narrow-band red-emitting nanophosphor K₂NaGaF₆:Mn⁴⁺for warm white light-emitting diodes

Abstract: Here, we report a narrow band but efficient red nanophosphor K2NaGaF6:Mn4+for high quality warm white LEDs.

Cited by 80 publications

References 52 publications

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO₄:Mn⁴⁺

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO₄:Mn⁴⁺

Effects of chemical composition on the structural stability, elastic, vibrational, and electronic properties of Cs₂NaLnX₆ (Ln = La…Lu, X = F, Cl, Br, I) elpasolites

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

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The electronic and optical properties of a narrow-band red-emitting nanophosphor K2NaGaF6:Mn4+for warm white light-emitting diodes

Abstract: Here, we report a narrow band but efficient red nanophosphor K2NaGaF6:Mn4+for high quality warm white LEDs.

Cited by 80 publications

References 52 publications

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO4:Mn4+

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO4:Mn4+

Effects of chemical composition on the structural stability, elastic, vibrational, and electronic properties of Cs2NaLnX6 (Ln = La…Lu, X = F, Cl, Br, I) elpasolites

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

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The electronic and optical properties of a narrow-band red-emitting nanophosphor K₂NaGaF₆:Mn⁴⁺for warm white light-emitting diodes

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO₄:Mn⁴⁺

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO₄:Mn⁴⁺

Effects of chemical composition on the structural stability, elastic, vibrational, and electronic properties of Cs₂NaLnX₆ (Ln = La…Lu, X = F, Cl, Br, I) elpasolites

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