Shape-controlled synthesis of phosphor K2SiF6:Mn4+nanorods and their luminescence properties

Li, Xiaoqing; Su, Xiangming; Liu, Ping; Liu, Jie; Yao, Zhiling; Chen, Jiajun; Yao, Hui; Yu, Xibin; Zhan, Ming

doi:10.1039/c4ce01907e

Cited by 47 publications

(29 citation statements)

References 24 publications

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“…Mn 4+ ‐doped fluorides exhibit superior luminescence performance with ideal chromaticity ordinations and ease of operation. A series of red phosphors A 2 X F 6 :Mn 4+ and A 3 Y F 6 :Mn 4+ ( A is one type of alkaline ions, such as K, Na, Rb, or Cs; X is Si, Ge, or Zr; Y is Al or Ga) have been obtained by simple synthetic processes at room temperature . The two cations of alkali metals in these host lattice are the same.…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism and optimized luminescence of Mn⁴⁺‐doped unequal dual‐alkaline hexafluorosilicate Li_0.5Na_1.5SiF₆

et al. 2018

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A novel red phosphor Li0.5Na1.5SiF6:Mn4+ (LNSF:Mn) based on the unequal dual‐alkaline hexafluorosilicate with superior optical performances has been synthesized via ion‐exchange between [MnF6]2− and [SiF6]2− at room temperature. The composition and the crystal structure of the as‐obtained phosphor LNSF:Mn were determined by energy‐dispersive x‐ray spectroscopy (EDS) and x‐ray diffraction (XRD), respectively. The formation mechanism of the red phosphor LNSF:Mn has been discussed in detail. The phosphor LNSF:Mn exhibits good chromaticity properties and a quantum yield (QY) of 96.1%, which are better than the identified fluorosilicate phosphors Na2SiF6:Mn4+ (NSF:Mn) and K2SiF6:Mn4+ (KSF:Mn). A broad and intense absorption in the blue and a bright emission in red‐shifted wavelengths make the phosphor LNSF:Mn a desired candidate for applications in warm white light‐emitting diodes.

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Section: Introductionmentioning

confidence: 99%

Formation mechanism and optimized luminescence of Mn⁴⁺‐doped unequal dual‐alkaline hexafluorosilicate Li_0.5Na_1.5SiF₆

et al. 2018

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“…[13][14][15][16][17][18][19][20][21] For example, in our previous work, 20 we hydrothermally synthesized BaGeF 6 :Mn 4+ red phosphor and investigated its potential application in WLED devices. K 2 XF 6 :Mn 4+ and BaXF 6 :Mn 4+ have been prepared by many methods, including co-precipitation method, hydrothermal method and wet chemical etching method.…”

Section: Introductionmentioning

confidence: 99%

Red-emitting phosphors Na₂XF₆:Mn⁴⁺(X = Si, Ge, Ti) with high colour-purity for warm white-light-emitting diodes

et al. 2015

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Red-emitting phosphors Na 2 XF 6 :Mn 4+ (X ¼ Si, Ge, Ti) were synthesized by a simple co-precipitation method. The crystal structure, morphology and composition of as-prepared phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometer (EDS) and atomic absorption spectroscopy (AAS). Their optical properties were investigated by photo-luminescent spectra (PL), diffuse reflectance spectra (DRS), and the luminescence decay curves. These phosphors exhibit broad excitation band in blue regions and intense emission in red regions with high color-purity. The sample Na 2 SiF 6 :Mn 4+ shares bright red emission under blue light excitation, and its CIE coordinates are x ¼ 0.684, y ¼ 0.315, which are close to the NTSC (National Television Standard Committee) standard values for red (x ¼ 0.67, y ¼ 0.33). The white-light-emitting diodes (WLEDs) fabricated with this phosphor emits intense warm white-light with lower color temperature (3930 K) and higher color rendering index (92.3). The above results indicated that red phosphor Na 2 SiF 6 :Mn 4+ maybe serve as a red-emitting phosphor for application in warm WLEDs.

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“…Red phosphors composed of Mn 4+ activated complex fluorides show a broad absorption band that overlapped with the electroluminescence (EL) band of InGaN chip . The problem of reabsorption can be resolved by mixing Mn 4+ activated complex fluorides and phosphor YAG:Ce to WLEDs because of the larger stokes shift of Mn 4+ ‐activated complex fluorides (there is no overlapping between their excitation and emission spectra).…”

Section: Introductionmentioning

confidence: 99%

“…Red phosphor Cs 2 TiF 6 :Mn 4+ as a novel red phosphor on a large scale was obtained through cation exchange method at ambient temperature . The morphology of red phosphors K 2 SiF 6 :Mn 4+ nanoparticles could be modulated by changing the molar ration of potassium oleate and SiO 2 spheres/KMnO 4 used in a liquid‐solid solution route at room temperature . In some cases, starting materials such as expensive metals Ti, Ge, and Zr are used and the mechanism of formation responsible for forming Mn 4+ activated complex fluorides red phosphor is unclear …”

Section: Introductionmentioning

confidence: 99%

Optimized photoluminescence of red phosphor Na₂SnF₆:Mn⁴⁺ as red phosphor in the application in “warm” white LEDs

Pan

Chen

et al. 2017

J Am Ceram Soc

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The Mn4+ activated fluostannate Na2SnF6 red phosphor was synthesized from starting materials metallic tin shots, NaF, and K2MnF6 in HF solution at room temperature by a two‐step method. The formation mechanism responsible for preparing Na2SnF6:Mn4+ (NSF:Mn) has been investigated. The influences of synthetic parameters: such as concentrations of HF and K2MnF6 in reaction system, reaction time, and temperature on crystallinity, microstructure, and luminescence intensity of NSF:Mn have been investigated based on detailed experimental results. The actual doping concentration of Mn4+ in the NSF:Mn host lattice is less than 0.12 mol%. The most of K2MnF6 is decomposed in HF solution especially in hydrothermal system at elevated temperatures. The color of the as‐prepared NSF:Mn samples changes from orange to white when the temperature is higher than 120°C, which indicates the lower concentration of luminescence centers in the crystals. A series of “warm” white light‐emitting diodes with color rendering index (CRI) higher than 88 and correlated color temperatures between 3146 and 5172 K were obtained by encapsulating the as‐prepared red phosphors NSF:Mn with yellow one Y3Al5O12:Ce3+ (YAG:Ce) on 450 nm blue InGaN chips. The advantage of the synthetic strategy to obtain NSF:Mn can be extended to developing Mn4+‐doped red phosphors from low‐costing metals at room temperature for large‐scale industrial applications.

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Shape-controlled synthesis of phosphor K₂SiF₆:Mn⁴⁺nanorods and their luminescence properties

Abstract: A red phosphor K2SiF6:Mn4+ nanorod is successfully prepared through an efficient one-step method at room temperature for 30 min. Under UV excitation, K2SiF6:Mn4+ nanorods show better red emission corresponding to the characteristic lines of Mn4+ compared to bulk materials.

Cited by 47 publications

References 24 publications

Formation mechanism and optimized luminescence of Mn⁴⁺‐doped unequal dual‐alkaline hexafluorosilicate Li_0.5Na_1.5SiF₆

Formation mechanism and optimized luminescence of Mn⁴⁺‐doped unequal dual‐alkaline hexafluorosilicate Li_0.5Na_1.5SiF₆

Red-emitting phosphors Na₂XF₆:Mn⁴⁺(X = Si, Ge, Ti) with high colour-purity for warm white-light-emitting diodes

Optimized photoluminescence of red phosphor Na₂SnF₆:Mn⁴⁺ as red phosphor in the application in “warm” white LEDs

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Shape-controlled synthesis of phosphor K2SiF6:Mn4+nanorods and their luminescence properties

Abstract: A red phosphor K2SiF6:Mn4+ nanorod is successfully prepared through an efficient one-step method at room temperature for 30 min. Under UV excitation, K2SiF6:Mn4+ nanorods show better red emission corresponding to the characteristic lines of Mn4+ compared to bulk materials.

Cited by 47 publications

References 24 publications

Formation mechanism and optimized luminescence of Mn4+‐doped unequal dual‐alkaline hexafluorosilicate Li0.5Na1.5SiF6

Formation mechanism and optimized luminescence of Mn4+‐doped unequal dual‐alkaline hexafluorosilicate Li0.5Na1.5SiF6

Red-emitting phosphors Na2XF6:Mn4+(X = Si, Ge, Ti) with high colour-purity for warm white-light-emitting diodes

Optimized photoluminescence of red phosphor Na2SnF6:Mn4+ as red phosphor in the application in “warm” white LEDs

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Shape-controlled synthesis of phosphor K₂SiF₆:Mn⁴⁺nanorods and their luminescence properties

Formation mechanism and optimized luminescence of Mn⁴⁺‐doped unequal dual‐alkaline hexafluorosilicate Li_0.5Na_1.5SiF₆

Formation mechanism and optimized luminescence of Mn⁴⁺‐doped unequal dual‐alkaline hexafluorosilicate Li_0.5Na_1.5SiF₆

Red-emitting phosphors Na₂XF₆:Mn⁴⁺(X = Si, Ge, Ti) with high colour-purity for warm white-light-emitting diodes

Optimized photoluminescence of red phosphor Na₂SnF₆:Mn⁴⁺ as red phosphor in the application in “warm” white LEDs