The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

Deng, Tingting; Song, Enhai; Sun, Jiayi; Wang, L. Y.; Deng, Yaomin; Ye, Shi; Wang, J.; Zhang, Q. Y.

doi:10.1039/c7tc00011a

Cited by 145 publications

(48 citation statements)

References 51 publications

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“…The excitation and emission spectra, and the decay curves of the red phosphor LNSF:Mn measured at 78 and 298 K are shown in Figure . The two excitation bands peaking at 370 and 470 nm in the excitation spectra monitored at 620 nm are due to the 4 A 2g → 4 T 1g and 4 A 2g → 4 T 2g transitions of Mn 4+ according to the Tanabe‐Sugano diagram for Mn 4+ , which are consistent with the reported results of other Mn 4+ activated fluoride compounds . The maximum excitation band locating in blue region indicates that the red phosphor LNSF:Mn shows great promise in GaN based WLEDs.…”

Section: Resultssupporting

confidence: 87%

“…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%

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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: Resultssupporting

confidence: 87%

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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“…It can be seen that the emission intensity is almost the same in the temperature range from 300 K to 375 K and then drops sharply with the temperature above 400 K. At 425 K (150 C), it remains 88.8% of the initial intensity at 300 K. Similar thermal quenching behavior of Mn 4+ ion in uoride phosphors had been reported for several times. 49,56,57 We determine the activation energy (E a ) of K 2 LiGaF 6 :Mn 4+ for thermal quenching using eqn (1).…”

Section: +mentioning

confidence: 99%

Photoluminescence properties of a novel red fluoride K₂LiGaF₆:Mn⁴⁺nanophosphor

Zhu

Liu

et al. 2017

RSC Adv.

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Red K 2 LiGaF 6 :Mn 4+ phosphors have been synthesized by the facile cation-exchange method. To optimize the optical properties, the phosphors were synthesized by using different reaction conditions. The highest luminescence intensity was increased 3.6 times for the Mn concentration of 1%, reaction temperature of 20 C, and reaction time of 1 h. Replacement of the trivalent Al by Ga resulted in K 2 LiGaF 6 :Mn 4+ having better photoluminescence properties than K 2 LiAlF 6 :Mn 4+ . Furthermore, the studies of the temperaturedependent emission intensity of the phosphors confirmed their good thermal stability, making them promising red phosphor candidates for white light-emitting diodes.

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“…In addition, the absorption band from 350 to 400 nm originates from the 7 F 0 → 5 D 4 / 5 L 6 transitions of Eu 3+ . The optical indirect band gaps of LaScO 3 :Bi 3+ ,Tb 3+ ,Eu 3+ are calculated by following equation:

\begin{matrix} {(][, F ()(, R) h ν)}^{1 / 2} = A (h ν - E_{normalg}) \\ F (R) = {(1 - R)}^{2} true/ 2 R \end{matrix}

where E g is the optical band gap, F ( R ) is the absorption, and R is the reflectance (%) coefficient, hv represents the photon energy, respectively. Figure B shows the plots of [ F ( R ) hv ] 1/2 vs photo energy E g in the LaScO 3 :Bi 3+ ,Tb 3+ ,Eu 3+ phosphors.…”

Section: Resultsmentioning

confidence: 99%

Tunable color emission in LaScO₃:Bi³⁺,Tb³⁺,Eu³⁺ phosphor

et al. 2020

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LaScO3:xBi3+,yTb3+,zEu3+ (x = 0 − 0.04, y = 0 − 0.05, z = 0 − 0.05) phosphors were prepared via high‐temperature solid‐state reaction. Phase identification and crystal structures of the LaScO3:xBi3+,yTb3+,zEu3+ phosphors were investigated by X‐ray diffraction (XRD). Crystal structure of phosphors was analyzed by Rietveld refinement and transmission electron microscopy (TEM). The luminescent performance of these trichromatic phosphors is investigated by diffuse reflection spectra and photoluminescence. The phenomenon of energy transfer from Bi3+ and Tb3+ to Eu3+ in LaScO3:xBi3+,yTb3+,zEu3+ phosphors was investigated. By changing the ratio of x, y, and z, trichromatic can be obtained in the LaScO3 host, including red, green, and blue emission with peak centered at 613, 544, and 428 nm, respectively. Therefore, two kinds of white light‐emitting phosphors were obtained, LaScO3:0.02Bi3+,0.05Tb3+,zEu3+ and LaScO3:0.02Bi3+,0.03Eu3+,yTb3+. The energy transfer was characterized by decay times of the LaScO3:xBi3+, yTb3+, zEu3+ phosphors. Moreover absolute internal QY and CIE chromatic coordinates are shown. The potential optical thermometry application of LaScO3:Bi3+,Eu3+ was based on the temperature sensitivity of the fluorescence intensity ratio (FIR). The maximum Sa and Sr are 0.118 K−1 (at 473.15 K) and 0.795% K−1 (at 448.15 K), respectively. Hence, the LaScO3:Bi3+,Eu3+ phosphor is a good material for optical temperature sensing.

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The design and preparation of the thermally stable, Mn⁴⁺ ion activated, narrow band, red emitting fluoride Na₃GaF₆:Mn⁴⁺ for warm WLED applications

Abstract: Herein, a new red phosphor Na3GaF6:Mn4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature.

Cited by 145 publications

References 51 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

Photoluminescence properties of a novel red fluoride K₂LiGaF₆:Mn⁴⁺nanophosphor

Tunable color emission in LaScO₃:Bi³⁺,Tb³⁺,Eu³⁺ phosphor

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The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

Abstract: Herein, a new red phosphor Na3GaF6:Mn4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature.

Cited by 145 publications

References 51 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

Photoluminescence properties of a novel red fluoride K2LiGaF6:Mn4+nanophosphor

Tunable color emission in LaScO3:Bi3+,Tb3+,Eu3+ phosphor

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The design and preparation of the thermally stable, Mn⁴⁺ ion activated, narrow band, red emitting fluoride Na₃GaF₆:Mn⁴⁺ for warm WLED applications

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

Photoluminescence properties of a novel red fluoride K₂LiGaF₆:Mn⁴⁺nanophosphor

Tunable color emission in LaScO₃:Bi³⁺,Tb³⁺,Eu³⁺ phosphor