Cr3+-doped Mg4Ga4Ge3O16 near-infrared phosphor membrane for optical information storage and recording

Zhan, Yiyu; Jin, Yahong; Wu, Haoyi; Yuan, Lifang; Ju, Guifang; Lv, Yang; Hu, Yihua

doi:10.1016/j.jallcom.2018.11.065

Cited by 46 publications

(28 citation statements)

References 33 publications

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“…There are two kinds of antisite defects Ga Mg · and Mg Ga ′ in the MGG host. When Mg 2+ occupies the position of Ga 3+ or Ga 3+ occupies the position of Mg 2+ , the following equation appears to maintain electrical neutrality: , To further study the variation of the unit cell as Li + doped into the MGG:0.01Cr 3+ , the structure of M 2.85 L 0.3 GG:0.01Cr 3+ was analyzed by the General Structure Analysis System (GASA) software. The results of Rietveld refinement are displayed in Figure b.…”

Section: Resultsmentioning

confidence: 99%

Lithium Substitution Endowing Cr³⁺-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Dai

Wang

Liu

et al. 2019

ACS Appl. Electron. Mater.

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A way to improve the properties of near-infrared long persistent luminescence (NIR LPL) phosphor has been proposed, which is introducing the cation Li + which acts as both a cosolvent and a producer of additional defect. In this work, the afterglow time of Mg 2.85 Li 0.03 Ga 1.99 GeO 8 :0.01Cr 3+ lasts more than 15 h by introducing excessive Li + to Mg 3 Ga 2 GeO 8 :Cr 3+ (4 h). Moreover, the internal relationship between traps and afterglow has been comprehensively and systematically investigated by analyzing the thermoluminescence (TL) properties of Mg 3−x/2 Li x Ga 1.99 GeO 8 :0.01Cr 3+ carefully from three different aspects, such as different Li + concentrations (x = 0− 0.3), irradiation times (30 s−8 min), and afterglow decay times (30 s−10 h). The results reveals that the shallow traps preferentially act on the afterglow process to produce an intense and short luminescence, while deep traps act on the afterglow process by the tunneling effect to produce a weak and long-lasting luminescence. It is confirmed that the traps in the materials are continuously distributed, and the trap depths are calculated by using the initial rise method; the afterglow at room temperature is attributed to the traps with energy of 0.55−1.25 eV. Moreover, the motion trajectory of the carriers in the LPL decay process was further analyzed by establishing the persistent luminescence mechanism model. In addition, the material irradiated for 7 min at 0.3 Li + shows the optimum TL and afterglow properties and has a broad-band emission from 680 to 1100 nm. Therefore, the NIR LPL phosphor Mg 2.85 Li 0.03 Ga 1.99 GeO 8 :0.01Cr 3+ has good potential application prospects in the field of in vivo imaging.

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Section: Resultsmentioning

confidence: 99%

Lithium Substitution Endowing Cr³⁺-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Dai

Wang

Liu

et al. 2019

ACS Appl. Electron. Mater.

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“…Cr 3+ ions exhibit broadband absorption in the ultraviolet‐visible spectral range, which stems from its unique 3d 3 electronic structure. [ 13 ] In addition, Cr 3+ ions can display tunable narrowband or broadband spectrum from 600–1600 nm, depending on whether they are in a strong or weak crystal field environment, respectively. In a strong crystal field, the sharp emission comes from the spin‐forbidden 2 E→ 4 A 2 transition with a lifetime on the order of milliseconds.…”

Section: Introductionmentioning

confidence: 99%

“…Cr 3+ ions exhibit broadband absorption in the ultraviolet-visible spectral range, which stems from its unique 3d 3 electronic structure. [13] In addition, Cr 3+ ions can display tunable narrowband or broadband spectrum from 600-1600 nm, depending on whether they are in a strong or weak Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LED) are ideal light sources to meet the next generation of NIR spectroscopy. However, NIR phosphors have numerous problems such as low quantum yields (QY) and low thermal stability.…”

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confidence: 99%

Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes

Wang

Wei

et al. 2022

Advanced Optical Materials

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light in this range is known as the first biological window, and the NIR radiation can effectively penetrate biological tissues, which means that a non-destructive and non-invasive diagnosis of the human physiological state can be performed by a perceptible penetration depth in biological tissues. [6] For plant cultivation, red/ photosensitive pigments (PR) and far-red/ photo sensitive pigments (PFR), two pigments indispensable for plant growth, have a specific absorption in the NIR region, and PFR has a strong absorption peak at 730 nm. [7] Various NIR-emitting materials have been developed for halogen lamps, lightemitting diodes (LEDs), organic LEDs (OLED), and phosphor-converted LEDs (pc-LEDs). Among them, halogen lamps have continuous ultra-broadband spectral properties from visible to NIR, but their low luminous efficiency, high operating temperature, and long response time limit their applications. [8] NIR LEDs overcome most of the drawbacks of halogen lamps, but the narrow fullwidth at half maximum (FWHM) and the LED arrangement luminous unevenness also severely limit their utilization at scale. [9] OLEDs are disappointing in terms of efficiency or temperature resistance, even though they have good applicability. [10] The most suitable solution may be the development of NIR pc-LEDs combining InGaN blue LED chips with broadband NIR phosphors. It satisfies both the ultra-broadband spectral emission and the requirements of compactness, efficiency, portability, and low cost. [11] For this purpose, broadband NIR phosphors that are well matched to the blue LED chips need to be developed.Many NIR broadband phosphors based on inorganic matrixdoped activators have been reported so far, [12] however, most of them have disadvantages such as unsuitable NIR emission wavelength, unstable emission intensity at high temperature, and low luminescence efficiency, which greatly limit their applications in various fields. Cr 3+ ions exhibit broadband absorption in the ultraviolet-visible spectral range, which stems from its unique 3d 3 electronic structure. [13] In addition, Cr 3+ ions can display tunable narrowband or broadband spectrum from 600-1600 nm, depending on whether they are in a strong or weak Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LED) are ideal light sources to meet the next generation of NIR spectroscopy. However, NIR phosphors have numerous problems such as low quantum yields (QY) and low thermal stability. In this work, a series of Gd 3 Y x In x Ga 5-2x O 12 :Cr 3+ NIR broadband phosphors with high internal quantum yields (IQYs) and high thermal stability are discovered by uniquely replacing GaO 6 in Gd 3 Ga 5 O 12 with Y 3+ and In 3+ in a co-doped manner through cation modulation. Under 449 nm excitation, Gd 3 Y 0.5 In 0.5 Ga 4 O 12 (GYIG):yCr 3+ depicts emission from 650 to 1050 nm with a full-width at half maximum (FWHM) of 134 nm. The emission intensity reaches its optimum value at y = 6%, while the IQY reaches an impressive 81.8% and, at 375 K, the emission intensity r...

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“…8 shows the upconversion (UC) emission spectra of Cr 3+ / Yb 3+ co-doped in all the glass samples under excitation 980 nm LD with two bands centered at $537 and 853 nm corresponding to 2 T 2 / 4 A 2g , and 2 E / 4 A 2g transitions of Cr 3+ , respectively. 17,45,[54][55][56] With the increase in salt concentration ratio p from 0.18 to 0.54, the emission intensities of these bands markedly increased. These increments were assigned to the aforementioned ET 1 process (for the band centered at 537 nm) and to the ET 3 process from 2 B 2g / 2 B 1g transition of Cu 2+ to 2 E / 4 A 2g transition of Cr 3+ (for the one at 853 nm), 5,46 which is proposed as follows:…”

Section: Resultsmentioning

confidence: 97%

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr³⁺/Yb³⁺ co-doped in lanthanum aluminosilicate glasses

Phan

et al. 2021

RSC Adv.

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Cr3+-doped Mg4Ga4Ge3O16 near-infrared phosphor membrane for optical information storage and recording

Cited by 46 publications

References 33 publications

Lithium Substitution Endowing Cr³⁺-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Lithium Substitution Endowing Cr³⁺-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr³⁺/Yb³⁺ co-doped in lanthanum aluminosilicate glasses

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Cr3+-doped Mg4Ga4Ge3O16 near-infrared phosphor membrane for optical information storage and recording

Cited by 46 publications

References 33 publications

Lithium Substitution Endowing Cr3+-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Lithium Substitution Endowing Cr3+-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in lanthanum aluminosilicate glasses

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Lithium Substitution Endowing Cr³⁺-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Lithium Substitution Endowing Cr³⁺-Doped Gallium Germanate Phosphors with Super-Broad-Band and Long Persistent Near-Infrared Luminescence

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr³⁺/Yb³⁺ co-doped in lanthanum aluminosilicate glasses