Development of Tb 3+ activated gadolinium aluminate garnet (Gd 3 Al 5 O 12 ) as highly efficient green-emitting phosphors

Teng, Xinying; Li, Jinkai; Duan, Guangbin; Liu, Zongming

doi:10.1016/j.jlumin.2016.06.029

Cited by 38 publications

(12 citation statements)

References 26 publications

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“…The internal quantum efficiency (IQE) is one of the crucial parameters of phosphors, and it can be determined by the following expression: IQE = ∫ L S /(∫ E R – ∫ E S ), where ∫ L S , ∫ E R , and ∫ E S represent the fluorescence integral intensities of the emission spectrum, background, and excitation spectrum, respectively. Under 269 nm excitation, the corresponding IQE value for LZGM 0.010 phosphor equals 81.67% (Figure S4), which is slightly higher than several previously reported green-emitting phosphors, such as YAG:Tb 3+ (IQE: 80.63%) and LuAG:Tb 3+ (IQE: 78.93%) …”

Section: Resultsmentioning

confidence: 58%

“…Under 269 nm excitation, the corresponding IQE value for LZGM 0.010 phosphor equals 81.67% (Figure S4), which is slightly higher than several previously reported greenemitting phosphors, such as YAG:Tb 3+ (IQE: 80.63%) and LuAG:Tb 3+ (IQE: 78.93%). 47 After removing the excitation source, the evident longpersistent luminescence can be observed from Mn-doped phosphors. Figure S5a shows the LPL decay curves of a series of LZGM x (x = 0.001−0.025) phosphors, and the afterglow spectra of the LZGM 0.004 sample at different delay times were recorded, as given in Figure S5b.…”

Section: ••mentioning

confidence: 99%

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Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Zhang

Zheng

et al. 2021

Inorg. Chem.

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Mechanoluminescent materials have shown great application potential in the fields of stress detection, anticounterfeiting, and optical storage; however, its development is hindered by the unclear mechanism. Different from the mainstream exploration of new mechanoluminescent materials in noncentrosymmetric structures, a centrosymmetric mechanoluminescent material Li 2 ZnGeO 4 :Mn 2+ is synthesized by a standard hightemperature solid-state reaction in an ambient atmosphere. Combined with the Rietveld refinement, photoluminescence, electron spin resonance, and X-ray photoelectron spectroscopy, it is proved that the increase in oxygen vacancies is accompanied by the self-reduction process from Mn 4+ to Mn 2+ , and the mechanism of mechanoluminescence is clarified through the afterglow and thermoluminescence spectra. The carriers trapped by the shallow traps participate in the mechanoluminescence process through the tunneling effect, while the carriers trapped by the deep traps take part in the mechanoluminescence process via conduction band or tunneling. A signature anti-counterfeiting application is designed using the new mechanoluminescent material Li 2 ZnGeO 4 :0.004Mn 2+ . Utilizing the afterglow characteristics of Li 2 ZnGeO 4 :xMn 2+ phosphors, we designed an intelligent longpersistent luminescence quick response code (QR-code) and visualized information encoding/decoding model, which provides a fast, simple, and effective method for information encryption, transformation, and dynamic anti-counterfeiting. This study not only analyzes the self-reduction and mechanoluminescence processes in detail but also breaks the limitation of crystal symmetry and provides a new strategy for the exploration of novel mechanoluminescent materials.

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Section: Resultsmentioning

confidence: 58%

Section: ••mentioning

confidence: 99%

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Zhang

Zheng

et al. 2021

Inorg. Chem.

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“…This technique usually requires a uniform mixture of materials or severe grinding and high temperature, which may have a negative impact on the microstructure of the resulting material. At present, it has been reported that GAP was prepared by coprecipitation and sol-gel method, but there is no relevant literature report on the hydrothermal solid-phase method [7][8][9][10]. Because hydrothermal method is to promote the chemical reaction of metal salt in sealed pressure vessel by high temperature and high pressure, the product has the advantages of high purity, complete grain development, uniform composition and simple process.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer

Zhong²,

Dai

et al. 2020

Mater. Res. Express

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Gadolinium aluminate (GdAlO 3 , GAP) nano whiskers were synthesized by the hydrothermal-solid state method, Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and thermogravimetry-differential thermal analysis (TG-DTA) were employed to analyze the phase change and the nucleation mechanism of GAP during calcing process. The results show that the precursor of GAP prepared by hydrothermal is (NH 4 ) x GdAl(OH) y (NO 3 ) z ·nH2O. When the calcination temperature is higher than 900°C, the precursor recrystallizes, forming the needle shape GAP under the synergistic effect factors. The best preparation conditions are as follows: ammonia water as mineralizer, pH=9, calcination temperature 1100°C and holding time 3 h.

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“…[4][5][6][7][8] The Ga 3+ /Ce 3+ or Mg 2+ /Si 4+ /Ce 3+ co-doped (Gd, Y)AG solid solution is chosen in this study due to the following main reasons: (1) the large radius of Gd 3+ ions (1.053 Å)causes the GdAG phase to demonstrate a high temperature instability. [9][10][11][12] A smaller radius of Y 3+ ions (1.019 Å) doping in GdAG phase achieves the lattice stability; (2) the yellow phosphors need to be further improved. The Ga 3+ /Ce 3+ or Mg 2+ /Si 4+ /Ce 3+ co-doped (Gd, Y)AG phosphors with controllable color emission effectively reduced the production blue light composition in white LEDs is too high, and its properties of blue light components, [13][14][15][16] and its fluorescence properties can be significantly improved; (3) replacing Al 3+ with Ga 3+ or Mg 2+ /Si 4+ ions in (Gd, Y)AG results in the changes of crystal coordination field, which realizes the adjustable fluorescence performance of (Gd, Y)AG based phosphors.…”

Section: Introductionmentioning

confidence: 99%

Study on Design, Synthesis and Controlled Color Emission of (Gd,Y)AG: Ce3+ Based Phosphors Through Replacing Al3+ Partly

Ma¹,

Liu²,

Li³

et al. 2020

ES Mater. Manuf.

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Owing to its excellent yellow light emission, the (Gd,Y)AG:Ce 3+ based phosphors have been widely studied. In this paper, the (Gd,Y)3(Al1-xGax)5O12:Ce 3+ (x=0.1-0.8) and (Gd,Y)3(Al1-2yMgySiy)5O12:Ce 3+ (y=0.05-0.4) phosphors were successfully prepared by coprecipitation and high temperature solid phase method, respectively. The lattice stabilization, microstructure and fluorescence properties were systematically investigated. With increasing the concentration of Ga 3+ , the emission peaks of (Gd,Y)3Al5O12:Ga 3+ /Ce 3+ phosphors displayed a blue-shift from ~575 nm (yellow) to ~549 nm (yellow-green), and the decay time was decreased gradually. However, the emission peaks of (Gd,Y)AG:Mg 2+ /Si 4+ /Ce 3+ phosphors red shifted from ~575 nm (yellow) to ~592 nm (orange-red) with increasing the concentration of Mg 2+ /Si 4+ , and the decay time change was similar to the former. The underlying mechanisms were thoroughly investigated and elucidated. In addition, the effect of temperature on the fluorescence properties of (Gd,Y)AG:Ce 3+ based phosphors was investigated in detail. The (Gd,Y)AG:Ce 3+ based phosphors show promising potential in various lighting and optical display applications.

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Development of Tb 3+ activated gadolinium aluminate garnet (Gd 3 Al 5 O 12 ) as highly efficient green-emitting phosphors

Cited by 38 publications

References 26 publications

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer

Study on Design, Synthesis and Controlled Color Emission of (Gd,Y)AG: Ce3+ Based Phosphors Through Replacing Al3+ Partly

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Development of Tb 3+ activated gadolinium aluminate garnet (Gd 3 Al 5 O 12 ) as highly efficient green-emitting phosphors

Cited by 38 publications

References 26 publications

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li2ZnGeO4:Mn2+

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li2ZnGeO4:Mn2+

Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer

Study on Design, Synthesis and Controlled Color Emission of (Gd,Y)AG: Ce3+ Based Phosphors Through Replacing Al3+ Partly

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Product

Resources

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Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺