Sol-gel combustion synthesis and near-infrared luminescence of Ni2+-doped MgAl2O4 spinel phosphor

Deng, Yu; Gao, Yuan; Zhu, Fengmei; Zhu, Boming; Huang, Ling; Qiu, Jianbei

doi:10.1016/j.ceramint.2024.01.136

Cited by 18 publications

(2 citation statements)

References 48 publications

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“…33−38 A previous study has shown that the replacement of high valence ions in octahedrons by Ni 2+ ions results in an imbalance in the electric valence, the existence of electron-poor cavities, and a reduced NIR emission intensity. 39 We designed and synthesized the NIR phosphor materials from the MgAl 2 O 4 spinel matrix codoped with Ni 2+ as the luminescence center and Zr 4+ as the charge compensator by the sol−gel combustion method. We then conducted systematic studies on the composition, including the occupancy of the dopants, the structure, and the NIR luminescence properties of the phosphor.…”

Section: Introductionmentioning

confidence: 99%

“…MgAl 2 O 4 spinel is a tightly packed, face-centered cubic structure of the Al–O octahedron and Mg–O tetrahedron with excellent physical and chemical stability. The sol–gel sintering method is fast, it takes lower reaction temperature, and the product has uniform particle size and controllable microscopic morphology, which has become the method of choice for the preparation of ultrafine fluorescent materials and transparent ceramic precursors, including the MgAl 2 O 4 matrix and phosphors. − A previous study has shown that the replacement of high valence ions in octahedrons by Ni 2+ ions results in an imbalance in the electric valence, the existence of electron-poor cavities, and a reduced NIR emission intensity …”

Section: Introductionmentioning

confidence: 99%

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Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Deng,

Zhu,

Gao

et al. 2024

Inorg. Chem.

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Near-infrared (NIR) phosphor conversion light-emitting diodes (pc-LEDs) have great application potential as NIR light sources in many fields such as food analysis, night vision illumination, and bioimaging for noninvasive medical diagnosis. In general, phosphors synthesized by a high-temperature solidphase method have large particle sizes and have to be processed to fine powders by a grinding process, which may introduce surface defects and lower the luminous efficiency. Here, we report a sol−gel sintering method with ammonium nitrate and citric acid as the sacrificing agents to synthesize high purity, nanosized (less than 50 nm) Zr 4+ /Ni 2+ codoped MgAl 2 O 4 spinel NIR phosphors, in which MgAl 2 O 4 spinel is the matrix, Ni 2+ is the luminous center, and Zr 4+ acts as the charge compensator. We systematically characterized the crystal structures and NIR luminescence properties of the Ni 2+ -doped MgAl 2 O 4 and the Zr 4+ /Ni 2+ codoped MgAl 2 O 4 . Under 390 nm light excitation, the emission spectrum of the Ni 2+ -doped MgAl 2 O 4 phosphor covers 900−1600 nm, the half-peak width is 251 nm, and the peak position is located at 1230 nm. We demonstrated that by incorporating small amounts of Zr 4+ as the charge compensator, the NIR emission intensity of the Zr 4+ /Ni 2+ codoped MgAl 2 O 4 nanosized phosphor was doubled over that of the Ni 2+ -doped MgAl 2 O 4 phosphor. The optimal content of the charge compensator was 2 mol %. More importantly, the inclusion of Zr 4+ led to a NIR phosphor with improved thermal stability in luminous properties, and the luminous intensity measured at 100 °C was 33.83% of that measured at room temperature (20 °C). This study demonstrates that NIR phosphor nanomaterials with high-purity and enhanced optical properties can be designed and synthesized through the charge compensation strategy by a sol−gel sintering method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Deng,

Zhu,

Gao

et al. 2024

Inorg. Chem.

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Blue‐Light‐Excitable Broadband Ca₃Ga₂Ge₃O₁₂:Cr³⁺,Ni²⁺ Phosphor for the Applications in NIR‐II Window

Zhao,

Shao,

Liu

et al. 2024

Laser & Photonics Reviews

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Near‐infrared (NIR) phosphor‐converted light‐emitting diode (pc‐LED) light sources in the second NIR window (NIR‐II, 1000–1700 nm) have sparked great interest for their emerging applications in non‐destructive detection and medical diagnostics fields. However, the development of efficient NIR‐II phosphors that can be excited by commercial blue LED chips remains a significant challenge, and thus impeding the applications of NIR pc‐LED. Herein, a blue‐light‐excitable broadband NIR‐II luminescence of Ni2+ is achieved upon incorporating Cr3+ and Ni2+ into the Ca3Ga2Ge3O12 (CGGO) host simultaneously. Through the energy transfer from Cr3+ to Ni2+, CGGO:Cr3+,Ni2+ phosphor presents the improved NIR‐II emission peaking at 1470 nm under 460 nm blue light excitation. The internal/external quantum efficiency values are significantly improved from 13.8%/3.3% to 24.6%/13.3% along with the enhanced luminescence thermal stability. Finally, a NIR pc‐LED is fabricated by combining CGGO:Cr3+,Ni2+ phosphor with 450 nm blue chip, and its potential applications in non‐destructive examination and biomedical imaging fields have been demonstrated. The strategy of Cr3+ and Ni2+ co‐doping solves the problem that Ni2+ luminescence cannot be effectively excited by blue light and provides the design insights to exploit more ultra‐broadband NIR pc‐LEDs based on blue LED chips.

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Efficient broad-band NIR-II emitting phosphor Mg4Ta2O9: Ni2+ with satisfactory thermal stability of luminescence

Li,

Wang,

Niu

et al. 2024

Ceramics International

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Sol-gel combustion synthesis and near-infrared luminescence of Ni2+-doped MgAl2O4 spinel phosphor

Cited by 18 publications

References 48 publications

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Blue‐Light‐Excitable Broadband Ca₃Ga₂Ge₃O₁₂:Cr³⁺,Ni²⁺ Phosphor for the Applications in NIR‐II Window

Efficient broad-band NIR-II emitting phosphor Mg4Ta2O9: Ni2+ with satisfactory thermal stability of luminescence

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Sol-gel combustion synthesis and near-infrared luminescence of Ni2+-doped MgAl2O4 spinel phosphor

Cited by 18 publications

References 48 publications

Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Blue‐Light‐Excitable Broadband Ca3Ga2Ge3O12:Cr3+,Ni2+ Phosphor for the Applications in NIR‐II Window

Efficient broad-band NIR-II emitting phosphor Mg4Ta2O9: Ni2+ with satisfactory thermal stability of luminescence

Contact Info

Product

Resources

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Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Blue‐Light‐Excitable Broadband Ca₃Ga₂Ge₃O₁₂:Cr³⁺,Ni²⁺ Phosphor for the Applications in NIR‐II Window