“…Therefore, the effective resonance-type energy transfer from Eu 2+ to Mn 2+ is expected. This type of energy transfer is quite common and has been observed in several Eu 2+ - and Mn 2+ -coactivated phosphors such as CaCl 2 :Eu,Mn, KBr:Eu,Mn, BaMg 2 Si 2 O 7 :Eu,Mn, and Ba 3 MgSi 2 O 8 :Eu,Mn, respectively. 4 Spectral overlap between the PL spectrum of (Ca 0.99 Eu 0.01 )Al 2 Si 2 O 8 (solid line) and PLE spectrum of (Ca 0.75 Mn 0.25 )Al 2 Si 2 O 8 (dashed line).…”
Section: Resultsmentioning
confidence: 75%
“…Therefore, the effective resonance-type energy transfer from Eu 2+ to Mn 2+ is expected. This type of energy transfer is quite common and has been observed in several Eu 2+ -and Mn 2+ -coactivated phosphors such as CaCl 2 : Eu,Mn, 2 KBr:Eu,Mn, 6 BaMg 2 Si 2 O 7 :Eu,Mn, 4 and Ba 3 MgSi 2 O 8 : Eu,Mn, 7 respectively.…”
Section: Resultsmentioning
confidence: 76%
“…4 Rubio et al 5 proposed an ionic radius criterion to predict paring between two impurity dopant ions in alkali halide host matrice, which may provide a reasonable basis for selecting appropriate impurity dopant ions for developing efficient phosphor materials. Furthermore, the Eu 2+ fMn 2+ energy transfer mechanism in KBr:Eu 2+ ,Mn 2+ phosphor was described by Mendez et al 6 who proposed the possible formation of small Eu 2+ -Mn 2+ clusters in the KBr lattice. Mendez et al also indicated that the Eu 2+ f Mn 2+ energy transfer can be explained by assuming that a dipole-quadrupole or exchange (superexchange) interaction mechanism is active in the Eu 2+ -Mn 2+ cluster formation.…”
Section: Introductionmentioning
confidence: 96%
“…Furthermore, the Eu 2+ →Mn 2+ energy transfer mechanism in KBr:Eu 2+ ,Mn 2+ phosphor was described by Mendez et al . who proposed the possible formation of small Eu 2+ −Mn 2+ clusters in the KBr lattice. Mendez et al also indicated that the Eu 2+ → Mn 2+ energy transfer can be explained by assuming that a dipole−quadrupole or exchange (superexchange) interaction mechanism is active in the Eu 2+ −Mn 2+ cluster formation …”
Section: Introductionmentioning
confidence: 99%
“…Mendez et al also indicated that the Eu 2+ f Mn 2+ energy transfer can be explained by assuming that a dipole-quadrupole or exchange (superexchange) interaction mechanism is active in the Eu 2+ -Mn 2+ cluster formation. 6 Very recently, Kim et al reported that Ba 3 MgSi 2 O 8 :Eu,Mn can be used as a phosphor for fabrication of a warm whitelight emitting diode. 7 They concluded that with optimal excitation wavelength at 375 nm Ba 3 MgSi 2 O 8 :Eu,Mn was observed to show three emission bands centered at 442 nm (from Eu 2+ and with decay time of 0.32 µsec), 505 nm (from Eu 2+ and with decay time of 0.64 µsec), and 620 nm (from Mn 2+ and with a decay time of 750 µsec) 7 , respectively.…”
A series of Eu 2+ -and Mn 2+ -coactivated CaAl 2 Si 2 O 8 phosphors have been synthesized at 1400 °C under a reduced atmosphere and their luminescence properties have been investigated as a function of activator and coactivator concentrations. We have discovered that energy transfers from Eu 2+ to Mn 2+ by directly observing significant overlap of the excitation spectrum of Mn 2+ and the emission spectrum of Eu 2+ as well as the systematic relative decline and growth of emission bands of Eu 2+ and Mn 2+ , respectively. The critical distance and average separation of Eu 2+ and Mn 2+ have also been calculated. By utilizing the principle of energy transfer, we have also demonstrated that with appropriate tuning of activator content CaAl 2 Si 2 O 8 :Eu 2+ ,Mn 2+ phosphors exhibit great potential to act as a phosphor for white-light ultraviolet light-emitting diodes (UVLEDs).
“…Therefore, the effective resonance-type energy transfer from Eu 2+ to Mn 2+ is expected. This type of energy transfer is quite common and has been observed in several Eu 2+ - and Mn 2+ -coactivated phosphors such as CaCl 2 :Eu,Mn, KBr:Eu,Mn, BaMg 2 Si 2 O 7 :Eu,Mn, and Ba 3 MgSi 2 O 8 :Eu,Mn, respectively. 4 Spectral overlap between the PL spectrum of (Ca 0.99 Eu 0.01 )Al 2 Si 2 O 8 (solid line) and PLE spectrum of (Ca 0.75 Mn 0.25 )Al 2 Si 2 O 8 (dashed line).…”
Section: Resultsmentioning
confidence: 75%
“…Therefore, the effective resonance-type energy transfer from Eu 2+ to Mn 2+ is expected. This type of energy transfer is quite common and has been observed in several Eu 2+ -and Mn 2+ -coactivated phosphors such as CaCl 2 : Eu,Mn, 2 KBr:Eu,Mn, 6 BaMg 2 Si 2 O 7 :Eu,Mn, 4 and Ba 3 MgSi 2 O 8 : Eu,Mn, 7 respectively.…”
Section: Resultsmentioning
confidence: 76%
“…4 Rubio et al 5 proposed an ionic radius criterion to predict paring between two impurity dopant ions in alkali halide host matrice, which may provide a reasonable basis for selecting appropriate impurity dopant ions for developing efficient phosphor materials. Furthermore, the Eu 2+ fMn 2+ energy transfer mechanism in KBr:Eu 2+ ,Mn 2+ phosphor was described by Mendez et al 6 who proposed the possible formation of small Eu 2+ -Mn 2+ clusters in the KBr lattice. Mendez et al also indicated that the Eu 2+ f Mn 2+ energy transfer can be explained by assuming that a dipole-quadrupole or exchange (superexchange) interaction mechanism is active in the Eu 2+ -Mn 2+ cluster formation.…”
Section: Introductionmentioning
confidence: 96%
“…Furthermore, the Eu 2+ →Mn 2+ energy transfer mechanism in KBr:Eu 2+ ,Mn 2+ phosphor was described by Mendez et al . who proposed the possible formation of small Eu 2+ −Mn 2+ clusters in the KBr lattice. Mendez et al also indicated that the Eu 2+ → Mn 2+ energy transfer can be explained by assuming that a dipole−quadrupole or exchange (superexchange) interaction mechanism is active in the Eu 2+ −Mn 2+ cluster formation …”
Section: Introductionmentioning
confidence: 99%
“…Mendez et al also indicated that the Eu 2+ f Mn 2+ energy transfer can be explained by assuming that a dipole-quadrupole or exchange (superexchange) interaction mechanism is active in the Eu 2+ -Mn 2+ cluster formation. 6 Very recently, Kim et al reported that Ba 3 MgSi 2 O 8 :Eu,Mn can be used as a phosphor for fabrication of a warm whitelight emitting diode. 7 They concluded that with optimal excitation wavelength at 375 nm Ba 3 MgSi 2 O 8 :Eu,Mn was observed to show three emission bands centered at 442 nm (from Eu 2+ and with decay time of 0.32 µsec), 505 nm (from Eu 2+ and with decay time of 0.64 µsec), and 620 nm (from Mn 2+ and with a decay time of 750 µsec) 7 , respectively.…”
A series of Eu 2+ -and Mn 2+ -coactivated CaAl 2 Si 2 O 8 phosphors have been synthesized at 1400 °C under a reduced atmosphere and their luminescence properties have been investigated as a function of activator and coactivator concentrations. We have discovered that energy transfers from Eu 2+ to Mn 2+ by directly observing significant overlap of the excitation spectrum of Mn 2+ and the emission spectrum of Eu 2+ as well as the systematic relative decline and growth of emission bands of Eu 2+ and Mn 2+ , respectively. The critical distance and average separation of Eu 2+ and Mn 2+ have also been calculated. By utilizing the principle of energy transfer, we have also demonstrated that with appropriate tuning of activator content CaAl 2 Si 2 O 8 :Eu 2+ ,Mn 2+ phosphors exhibit great potential to act as a phosphor for white-light ultraviolet light-emitting diodes (UVLEDs).
A series of M 2 SiO 4 -based phosphors (M: alkalineearth metal), (Ba,Ca) 2 SiO 4 : xEu, yMn, and zDy were synthesized by the solid-state reaction method. The XRD results showed all diffraction peaks of samples comply well with the T-phase (Ba,Ca) 2 SiO 4 , JCPDS#36-1449. Moreover, there were no obvious shifting of peaks or other impurity phases detected except that only higher levels of activator Eu-ion doping or Dy 3+ co-doping among the current doping levels. The excitation spectrum of all samples shows a broad band and implies that these phosphors can be excited by the range UV region to 500 nm and may be recommended for white LEDs. The strong emission peaks observed in the red region, excited by 360 or 421 nm, corresponding to the 4 T-6 A forbidden transition of Mn 2+ ions and weak peak of the blue to green broad emission bands observed at 466 nm is due to f-d transitions of Eu 2+ ions. Also, it was proved that Dy 3+ co-doping in different concentrations enhances the photoluminescence intensities.
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