Strong red emission in Bi3+ and Mn4+ codoped Mg3.5Ge1.25O6 phosphors applied in optical agriculture

Huang, Qiying; Ye, Weihao; Hu, Gang; Liu, Xiaotang

doi:10.1016/j.jlumin.2019.01.047

Cited by 12 publications

(7 citation statements)

References 56 publications

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“…Furthermore, it is found that the Bi 3+ emission positions as the Y/Gd ratios change did not change in the (Y,Gd)VO4:Bi 3+ ,Eu 3+ [45][46]. In some already-reported cases, the Bi 3+ ion is also reported to serve as a role of "sensitizer" to improve the luminescence intensity of RE (e.g., Eu 3+ [2,[45][46], Tb 3+ [47], Tm 3+ [48] etc) and non-RE (e.g., Mn 4+ [49][50] etc) ions. With temporal fluorescence change like in the (Y,Gd)VO4:Bi 3+ ,Eu 3+ [45][46], the anti-counterfeiting applications are proposed.…”

Section: Introductionmentioning

confidence: 88%

Tuning the Bi³⁺-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScV_xP_1−xO₄:Bi³⁺ (0 ≤ x ≤ 1) solid solution

et al. 2019

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Section: Introductionmentioning

confidence: 88%

Tuning the Bi³⁺-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScV_xP_1−xO₄:Bi³⁺ (0 ≤ x ≤ 1) solid solution

et al. 2019

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“…Huang et al intensified the deep-red emission of Mg 14 Ge 5 O 24 : Mn 4+ by Bi 3+ coactivation, 13 which sensitized Mn 4+ ions effectively. Liang octahedrons, and it introduced some resonance effects due to the multiple luminescence centers.…”

Section: Introductionmentioning

confidence: 99%

“…Huang et al intensified the deep-red emission of Mg 14 Ge 5 O 24 : Mn 4+ by Bi 3+ coactivation, which sensitized Mn 4+ ions effectively. Liang et al boosted the deep-red emission of this phosphor by 2.49 times via substituting Ti 4+ and Sn 4+ in the Ge 4+ octahedrons, and it introduced some resonance effects due to the multiple luminescence centers .…”

Section: Introductionmentioning

confidence: 99%

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Kuttiat

Abraham

Kunti

et al. 2023

ACS Appl. Mater. Interfaces

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Red emission from Mn4+-containing oxides inspired the development of high color rendering and cost-effective white-light-emitting diodes (WLEDs). Aiming at this fact, a series of new crystallographic site modified (Mg, Ba)3M2GeO8: Mn4+ (M = Al, Ga) compositions were developed with strong deep-red emission in the reaction to UV and blue lights. The Mg3Al2GeO8 host is composed of three phases: orthorhombic-Mg3Ga2GeO8, orthorhombic-Mg2GeO4, and cubic-MgAl2O4. However, Mg3Ga2GeO8 secured an orthorhombic crystal structure. Interestingly, Mg3Al2GeO8: Mn4+ showed a 13-fold more intense emission than Mg3Ga2GeO8: Mn4+ since Mn4+ occupancy was preferable to [AlO6] sites compared to [GaO6]. The coexisting phases of MgAl2O4 and Mg2GeO4 in Mg3Al2GeO8: Mn4+ contributed to Mn4+ luminescence by providing additional [AlO6] and [MgO6] octahedrons for Mn4+ occupancy. Further, these sites reduced the natural reduction probability of Mn4+ to Mn2+ in [AlO4] tetrahedrons, which was confirmed using cathodoluminescence analysis for the first time. A cationic substitution strategy was employed on Mg3M2GeO8: Mn4+ to improve the luminescence, and Mg3–x Ba x M2GeO8: Mn4+ (M = Al, Ga) phosphors were synthesized. Partial substitution of larger Ba2+ ions in Mg2+ sites caused structural distortions and generated a new Ba impurity phase, which improved the photoluminescence. Compositionally tuned Mg2.73Ba0.27Al1.993GeO8: 0.005Mn4+ exhibited a 35-fold higher emission than that of Mg3Ga1.993GeO8: 0.005Mn4+. Additionally, this could retain 70% of its ambient emission intensity at 453 K. A warm WLED with a correlated color temperature (CCT) of 3730 K and a CRI of 89 was fabricated by combining the optimized red component with Y3Al5O12: Ce3+ and 410 nm blue LED. By tuning the ratio of blue (BaMgAl10O17: Eu2+), green (Ce0.63Tb0.37MgAl11O19), and red (Mg2.73Ba0.27Al2GeO8: 0.005Mn4+) phosphors, another WLED was developed using a 280 nm UV-LED chip. This showed natural white emission with a CRI of 79 and a CCT of 5306 K. Meanwhile, three red LEDs were also fabricated using the Mg2.73Ba0.27Al1.993GeO8: 0.005Mn4+ phosphor with commercial sources. These could be potential pc-LEDs for plant growth applications.

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“…Substituting in the germanate phases is not limited to Mn 4+ since the larger cationic sites can accommodate lanthanides − or Bi 3+ . For example, langasite-type Na 2 CaGe 6 O 14 shows thermal-sensitizing phosphorescence when doped with Pr 3+ .…”

Section: Introductionmentioning

confidence: 99%

“…21−23 Substituting in the germanate phases is not limited to Mn 4+ since the larger cationic sites can accommodate lantha-nides 24−26 or Bi 3+ . 27 For example, langasite 28 -type Na 2 CaGe 6 O 14 shows thermal-sensitizing phosphorescence when doped with Pr 3+ . 24 Noncentrosymmetric Na 2 CaGe 6 O 14 , which crystallizes with the P321 space group, is also interesting due to its piezoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Phosphorescence in Mn⁴⁺-DopedR⁺/R²⁺Germanates (R⁺= Na⁺or K⁺,R²⁺= Sr²⁺)

Новиков

Zhang

et al. 2022

Inorg. Chem.

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Single crystals of three new compounds, Na0.36Sr0.82Ge4O9 (1, proposed composition), Na2SrGe6O14 (2), and K2SrGe8O18 (3), were obtained and characterized using single-crystal X-ray diffraction. Their structures contain three-dimensional (3D) anionic frameworks built from GeO4 and GeO6 polyhedra. The presence of octahedral Ge4+ sites makes the new phases suitable for Mn4+ substitution to obtain red-emitting phosphors with a potential application for light conversion. Photoluminescence properties of Mn4+-substituted Na2SrGe6O14 (2) and K2SrGe8O18 (3) samples were studied over a range of temperatures, and red light photoluminescence associated with the electronic transitions of tetravalent manganese was observed. The Na2SrGe6O14 (2) phase was also substituted with Pr3+ on the mixed Na–Sr site similar to the previously studied Na2CaGe6O14:Pr3+. The red emission peak of the Pr3+ activator occurs at a shorter wavelength (610 nm) compared to that of Mn4+ (662–663 nm). Additionally, second harmonic generation (SHG) data were collected for the noncentrosymmetric Na2SrGe6O14 (2) phase, indicating weak SHG activity. Diffuse reflectance spectroscopy and density of states calculations were performed to estimate the band gap values for pristine Na2SrGe6O14 (2) and K2SrGe8O18 (3) phases.

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Strong red emission in Bi3+ and Mn4+ codoped Mg3.5Ge1.25O6 phosphors applied in optical agriculture

Cited by 12 publications

References 56 publications

Tuning the Bi³⁺-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScV_xP_1−xO₄:Bi³⁺ (0 ≤ x ≤ 1) solid solution

Tuning the Bi³⁺-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScV_xP_1−xO₄:Bi³⁺ (0 ≤ x ≤ 1) solid solution

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Phosphorescence in Mn⁴⁺-DopedR⁺/R²⁺Germanates (R⁺= Na⁺or K⁺,R²⁺= Sr²⁺)

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Strong red emission in Bi3+ and Mn4+ codoped Mg3.5Ge1.25O6 phosphors applied in optical agriculture

Cited by 12 publications

References 56 publications

Tuning the Bi3+-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScVxP1−xO4:Bi3+ (0 ≤ x ≤ 1) solid solution

Tuning the Bi3+-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScVxP1−xO4:Bi3+ (0 ≤ x ≤ 1) solid solution

Enriching the Deep-Red Emission in (Mg, Ba)3M2GeO8: Mn4+ (M = Al, Ga) Compositions for Light-Emitting Diodes

Phosphorescence in Mn4+-DopedR+/R2+Germanates (R+= Na+or K+,R2+= Sr2+)

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Tuning the Bi³⁺-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScV_xP_1−xO₄:Bi³⁺ (0 ≤ x ≤ 1) solid solution

Tuning the Bi³⁺-photoemission color over the entire visible region by manipulating secondary cations modulation in the ScV_xP_1−xO₄:Bi³⁺ (0 ≤ x ≤ 1) solid solution

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Phosphorescence in Mn⁴⁺-DopedR⁺/R²⁺Germanates (R⁺= Na⁺or K⁺,R²⁺= Sr²⁺)