Synthesis and luminescence properties of double perovskite Ba2MgGe2O7:Mn4+ deep red phosphor

Lu, Zuizhi; Fu, Anjie; Gao, Fangfang; Zhang, Xiaoshan; Zhou, Liya

doi:10.1016/j.jlumin.2018.06.061

Cited by 43 publications

(13 citation statements)

References 34 publications

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“…Besides, the quantum yield (QY) of the three samples was measured at room temperature under 450 nm excitation, averaged to be 36.8% (Figure S8). The QY is higher or comparable to those reported for other Mn 4+ -doped oxides (12.2% for SrLaScO 4 :Mn 4+ , 14.3% for Ba 2 MgGeO 7 :Mn 4+ , 16.1% for BaLaZnTaO 6 :Mn 4+ , 20.2% for Ba 2 LaSbO 6 :Mn 4+ , 29% for SrLaAlO 4 :Mn 4+ , 29.2% for Ba 2 YNbO 6 :Mn 4+ , 32.3% for Li 2 MgZrO 4 :Mn 4+ , 33% for Ca 2 GdTaO 6 :Mn 4+ , 36.3% for Li 2 Mg 3 SnO 6 :Mn 4+ , 37% for Ca 2 LuTaO 6 :Mn 4+ , 38.9% for Ca 2 GdSbO 6 :Mn 4+ , 39.1% for Ca 2 LuSbO 6 :Mn 4+ , 42.3% for Li 2 SnO 3 :Mn 4+ phosphor). It is left as an open question that whether it is possible to prepare the MgAl 2 O 4 :Mn 4+ phosphor free from anti-site defects and impurity Mn 3+/2+ valence state, in which case the Δ E a and QY may be further improved.…”

Section: Resultssupporting

confidence: 74%

Section: ( ) ( )mentioning

confidence: 96%

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Microsized Red Luminescent MgAl₂O₄:Mn⁴⁺ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Wang

et al. 2020

Inorg. Chem.

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A single-crystalline defect-less phosphor is desired for efficient luminescence of the therein doped optical activators. In this paper, microsized MgAl2O4:Mn4+ single-crystal phosphors with bright red luminescence were grown in molten LiCl salt at 950 °C, for application in blue LED pumped white lighting. By comparing the phosphor formation from various Mg2+- and Al3+-bearing sources, both the template-formation and the dissolution-diffusion processes were evidenced to account for the formation of the microsized MgAl2O4:Mn4+ crystallites. Using nano γ-Al2O3 as the Al3+-bearing precursor, the uniform MgAl2O4:Mn4+ microcrystallites with a {111} planes-exposed tetragonal bipyramid morphology were obtained. The photoluminescence property was studied at various temperatures, and Mg ↔ Al anti-site disorder induced luminescence broadening was discussed. The Mn4+ 2Eg → 4A2g transition in MgAl2O4 shows a quite short luminescence wavelength peaking at 651 nm and ultrabroadband emission extending to 850 nm. The luminescence is relatively robust against thermal effect with relatively high thermal quenching temperature of 400 K and activation energy of 0.23 eV. Employing the red-emitting MgAl2O4:Mn4+ crystallites, blue LED pumped white lighting prototypes were fabricated which simulate the solar-like spectrum and show neutral to warm white.

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Section: Resultssupporting

confidence: 74%

Section: ( ) ( )mentioning

confidence: 96%

Microsized Red Luminescent MgAl₂O₄:Mn⁴⁺ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Wang

et al. 2020

Inorg. Chem.

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“…However, the PL intensity of SGA:0.1%Mn 4+ sample gradually decreased with increasing temperature, which was due to thermal quenching. 65 Fig. 7(b) shows the normalized PL intensity as a function of temperature.…”

Section: Resultsmentioning

confidence: 99%

Novel far-red-emitting SrGdAlO₄:Mn⁴⁺ phosphors with excellent responsiveness to phytochrome P_FR for plant growth lighting

et al. 2018

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“…With the further increase in Ba 2+ ions' concentration to x = 0.1 and above, the XRD peaks of Mg impurity-phase o-MGO (at 2θ = 22.6 and 35.1°) and o-MGG (at 2θ = 36°) are observed to decrease gradually. Eventually, a new peak at 2θ = 28.7°, attributed to t-BMG, 24,25 is generated with the Ba 2+ doping, which becomes prominent when the Ba 2+ ions' concentration reached x = 0.10. According to Ozturk, the major structure could tolerate the size mismatch between Ba 2+ and Mg 2+ up to a certain limit of Ba 2+ substitution into the Mg 2+ sites.…”

Section: Effect Of Ba 2+mentioning

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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Synthesis and luminescence properties of double perovskite Ba2MgGe2O7:Mn4+ deep red phosphor

Cited by 43 publications

References 34 publications

Microsized Red Luminescent MgAl₂O₄:Mn⁴⁺ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Microsized Red Luminescent MgAl₂O₄:Mn⁴⁺ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Novel far-red-emitting SrGdAlO₄:Mn⁴⁺ phosphors with excellent responsiveness to phytochrome P_FR for plant growth lighting

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

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Synthesis and luminescence properties of double perovskite Ba2MgGe2O7:Mn4+ deep red phosphor

Cited by 43 publications

References 34 publications

Microsized Red Luminescent MgAl2O4:Mn4+ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Microsized Red Luminescent MgAl2O4:Mn4+ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Novel far-red-emitting SrGdAlO4:Mn4+ phosphors with excellent responsiveness to phytochrome PFR for plant growth lighting

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

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Product

Resources

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Microsized Red Luminescent MgAl₂O₄:Mn⁴⁺ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Microsized Red Luminescent MgAl₂O₄:Mn⁴⁺ Single-Crystal Phosphor Grown in Molten Salt for White LEDs

Novel far-red-emitting SrGdAlO₄:Mn⁴⁺ phosphors with excellent responsiveness to phytochrome P_FR for plant growth lighting

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