Influence of Mg2+ on luminescence efficiency and charge compensating mechanism in phosphor CaAl12O19:Mn4+

Pan, Yuexiao; Liu, G.K.

doi:10.1016/j.jlumin.2010.11.014

Cited by 78 publications

(23 citation statements)

References 16 publications

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“…12,29 The other group of peaks above 620 nm was attributed to the spin-forbidden 2 E g -4 A 2 transition. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] The zero-photon lines of 2 E g -4 A 2 transition of Mn 4+ cannot be detected at room temperature in our work, which was observed at a temperature below 30 K. 25 The luminescence of KTFM-1 was much weaker than KTFM-2 and KTFM-3 because reaction (2) rather than reaction (5) was dominant when HF was added in the last step. The primary difference between KTFM-2 and KTFM-3 in these experiments might be due to the difference in HF concentrations at the beginning of the reaction (5).…”

Section: Inuence Of Experimental Procedures Starting Materials Andmentioning

confidence: 99%

“…A class of red phosphors with Mn 4+ ions as luminescence centers are alternative candidates with simple synthetic processes and an abundance of starting materials; this is because the phosphors do not include rare earth elements. [12][13][14][15][16][17][18][19][20][21][22][23][24] Mn 4+ doped alkaline aluminates showed promise in white LEDs but the efficiency of their luminescence requires further improvement. [12][13][14] Red phosphors composed of Mn 4+ doped in complex uo-rides A 2 XF 6 :Mn 4+ (A is K or Na; X is Si, Ti, Ge, or Zr) and BaXF 6 :Mn 4+ (X is Si or Ti) show a broad absorption band that overlaps the electroluminescence band of GaN chips.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18][19][20][21][22][23][24] Mn 4+ doped alkaline aluminates showed promise in white LEDs but the efficiency of their luminescence requires further improvement. [12][13][14] Red phosphors composed of Mn 4+ doped in complex uo-rides A 2 XF 6 :Mn 4+ (A is K or Na; X is Si, Ti, Ge, or Zr) and BaXF 6 :Mn 4+ (X is Si or Ti) show a broad absorption band that overlaps the electroluminescence band of GaN chips. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Large Stokes shis and sharp emission peaks indicate that they are more suitable than Eu 2+ -doped nitrides due to their small reabsorption when mixing with phosphor YAG:Ce.…”

Section: Introductionmentioning

confidence: 99%

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Optimized photoluminescence of red phosphor K₂TiF₆:Mn⁴⁺synthesized at room temperature and its formation mechanism

et al. 2015

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A red phosphor K 2 TiF 6 :Mn 4+ (KTFM) has been synthesized by etching Ti(OC 4 H 9 ) 4 in HF solution with KMnO 4 and KF at room temperature for 30 min. The formation mechanism of red phosphor KTFM has been discussed based on detailed experimental results. We studied the influences of synthetic procedure and KMnO 4 concentration on the powder color and intensity of phosphor luminescence. The actual doping concentration of Mn 4+ in the K 2 TiF 6 (KTF) host lattice of the phosphor has been investigated by measuring the concentration of filtrate through ICP-AES analysis. The results showed that about 32.4 mol% of Mn elements was doped into KTF crystals at optimal Mn 4+ concentration (in precursor solution).The presence of HF was found to be essential to doping Mn 4+ into KTF due to the weakly acidic and complexing properties of HF. The red luminescence of Mn 4+ in KTF with a crystal structure matching standard card JCPDs (#28-0825), was first observed in the sample prepared from HF solution concentrations lower than 5 wt%. The dependence of the intensity of the luminescence on HF concentration might be due to the varying of Mn 4+ concentrations in KTF crystals. Higher HF concentration was associated with lower yield, because KTF is soluble in HF at high concentrations.Encapsulation of the red phosphor KTFM with YAG:Ce on a GaN layer produces "warm" white LEDs with color rendering of 86 at 3251 K.

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Section: Inuence Of Experimental Procedures Starting Materials Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimized photoluminescence of red phosphor K₂TiF₆:Mn⁴⁺synthesized at room temperature and its formation mechanism

et al. 2015

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“…Williams [18] reported the emission of Mn 4+ doped magnesium germanate red phosphor in 1947. Later, Kemeny et al [19] [20][21][22][23][24][25][26][27][28]. At present, Mn 4+ -doped phosphors are seldom used in WLEDs, so, in order to meet the requirement for practical application in WLEDs, it is necessary to further study the luminescence properties of Mn 4+ doped novel materials.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Synthesis and luminescence properties of novel red phosphors LiRGe2O6:Mn4+ (R = Al or Ga)

Cao

Luo

Xiong

et al. 2015

Journal of Alloys and Compounds

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“…enhancing the emission intensity of phosphor were also observed for Mn 4? doped CaAl 12 O 19 [28][29][30]. For La 2 LiTaO 6 :Mn 0.003 4?…”

Section: Xrd Characterization Of the Prepared Phosphorsmentioning

confidence: 99%

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

Wang

Yuan

et al. 2014

Appl. Phys. A

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A novel phosphor, Mn 4? doped La 2 LiTaO 6 , was developed by solid-state reaction method. The luminescent spectra and emission efficiencies of La 2 LiTaO 6 :-Mn x 4? (x = 0.001, 0.003, 0.005 and 0.01) were discussed. The effects of co-doped charge compensation ions, M = Mg 2? , Ca 2? , Na ? , were investigated, respectively. The excitation spectra indicated that La 2 LiTaO 6 :Mn 4? could be effectively excited by both NUV light and blue light. The emission spectra of the phosphor exhibit a broadband ranging from 670 to 720 nm with the maximum at about 709 nm in deep red region. The co-doping of Mg 2? could significantly improve the luminescent properties of La 2 LiTaO 6 :Mn 4? . Thus, phosphor La 2 LiTaO 6 :-Mn 4? , Mg 2? can serve as a key component to improve color rendering of blue-chip white-LEDs.

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Influence of Mg2+ on luminescence efficiency and charge compensating mechanism in phosphor CaAl12O19:Mn4+

Cited by 78 publications

References 16 publications

Optimized photoluminescence of red phosphor K₂TiF₆:Mn⁴⁺synthesized at room temperature and its formation mechanism

Optimized photoluminescence of red phosphor K₂TiF₆:Mn⁴⁺synthesized at room temperature and its formation mechanism

Synthesis and luminescence properties of novel red phosphors LiRGe2O6:Mn4+ (R = Al or Ga)

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

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Influence of Mg2+ on luminescence efficiency and charge compensating mechanism in phosphor CaAl12O19:Mn4+

Cited by 78 publications

References 16 publications

Optimized photoluminescence of red phosphor K2TiF6:Mn4+synthesized at room temperature and its formation mechanism

Optimized photoluminescence of red phosphor K2TiF6:Mn4+synthesized at room temperature and its formation mechanism

Synthesis and luminescence properties of novel red phosphors LiRGe2O6:Mn4+ (R = Al or Ga)

Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

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Optimized photoluminescence of red phosphor K₂TiF₆:Mn⁴⁺synthesized at room temperature and its formation mechanism

Optimized photoluminescence of red phosphor K₂TiF₆:Mn⁴⁺synthesized at room temperature and its formation mechanism