Sharp-Line Near-Infrared Emission from Tetrahedron-Occupied Ni2+ in Ca2GeO4 DOI
Wenjing Huang, Jiahui Zhang, Jiaqi Fan

et al.

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(33), P. 13370 - 13377

Published: Aug. 10, 2023

As far as we are concerned, the phenomenon of Ni2+ luminescence in tetrahedral coordination has not been reported. For first time, a new NIR phosphor Ca2GeO4:Ni2+ is developed this work. It found that emission from sharp peak attributed to unusual Ni2+-occupied GeO4 site lattice, instead conventional broadband octahedrally coordinated site. Crystal-field analysis applied, and parameters Dq, B, Δ calculated reveal relationship between profile crystal field strength. The optimal doping concentration be 1%. provides an efficient sharp-line (fwhm = 16 nm) centered at 1164 nm which originates 1T2 → 3T1 transition with internal quantum efficiency 23.1% decay lifetime about 300 μs. This work could provide some insights explore novel luminescent materials based on transition-metal elements.

Language: Английский

Intervalence charge transfer of Cr3+-Cr3+ aggregation for NIR-II luminescence DOI Creative Commons
Shengqiang Liu,

Jingxuan Du,

Zhen Song

et al.

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: July 25, 2023

The increasing demand for high-contrast biological imaging, non-destructive testing, and infrared night vision can be addressed by the development of high-performance NIR light-emitting materials. Unlike lanthanide (Ln3+) with sharp-line multiplets isolated Cr3+ NIR-I emission, this study reports first-ever NIR-II broadband luminescence based on intervalence charge transfer (IVCT) Cr3+-Cr3+ aggregation in gallate magentoplumbite. In particular, LaMgGa11O19:0.7Cr3+ exhibits dual-emission (NIR-I, 890 nm NIR-II, 1200 nm) a full width at half maximum (FWHM) 626 under 450 blue LED excitation. Moreover, anti-thermal quenching behavior (432% @ 290 K), attributed to energy among multiple centers. Cryogen absorption spectra, lifetimes decay (2.3 ms), electron paramagnetic experiments reveal → Cr2+-Cr4+ IVCT transition. application imaging as an optical contrast agent, is demonstrated. This work provides new insights into UV-NIR excitation aggregation.

Language: Английский

Citations

74
Super Broadband Emission Across NIR‐I and NIR‐II Under Blue Light Excitation of Cr3+, Ni2+ Co‐Doped Sr2GaTaO6 Phosphor Achieved by Two‐Site Occupation and Effective Energy Transfer DOI

Yifu Zhuo,

Fu‐Gen Wu,

Yaping Niu

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(8)

Published: March 20, 2024

Abstract The performance of the near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) mainly depends on NIR emitting phosphors used. Cr 3+ doped materials can be excited by blue light chips, but their emission is located in NIR‐I region (650–1000 nm). Ni 2+ are NIR‐II (1000–1700 nm), they cannot effectively chips. Herein, , mono‐doped, and co‐doped Sr 2 GaTaO 6 prepared investigated. ions occupy two octahedral sites Ga Ta 5+ . co‐doping has achieved breakthroughs. One to shift optimal excitation wavelength from violet due energy transfer (efficiency up 70%) other achieve broadband continuous across regions (650–1700 nm, with a full width at half maximum (FWHM) 410 nm (173 + 237 nm)). : 0.02Cr 0.01Ni phosphor combined commercial 460 chip realize its application organic compounds identification, night vision, biological imaging. This work points out direction for future development efficient super NIR‐emitting phosphors.

Language: Английский

Citations

68
Broadband Short-Wave Infrared-Emitting MgGa2O4:Cr3+, Ni2+ Phosphor with Near-Unity Internal Quantum Efficiency and High Thermal Stability for Light-Emitting Diode Applications DOI
Shihai Miao, Yanjie Liang, Ruiqi Shi

et al.

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(27), P. 32580 - 32588

Published: June 29, 2023

Blue InGaN chip-pumped short-wave infrared (SWIR) emitters have aroused tremendous attention and shown emerging applications in diverse fields such as healthcare, retail, agriculture. However, discovering blue light-emitting diode (LED)-pumped SWIR phosphors with a central emission wavelength over 1000 nm remains significant challenge. Herein, we demonstrate the efficient broadband luminescence of Ni2+ by simultaneously incorporating Cr3+ ions into MgGa2O4 lattice, sensitizer emitter. Because strong light absorption high energy transfer efficiency to Ni2+, obtained MgGa2O4:Cr3+, show intense peak at 1260 full width half maximum (FWHM) 222 under excitation light. The optimized phosphor presents an ultra-high photoluminescence quantum 96.5% outstanding thermal stability (67.9%@150 °C). A source has been fabricated through combination prepared commercial 450 LED chip, delivering radiant power 14.9 mW 150 mA input current. This work not only demonstrates feasibility developing high-power using converter technology but also new insights importance technology.

Language: Английский

Citations

60
Ni2+-doped MgTa2O6 phosphors capable of near-infrared II and III emission under blue-light excitation DOI
Fengmei Zhu, Yuan Gao,

Boming Zhu

et al.

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 479, P. 147568 - 147568

Published: Nov. 20, 2023

Language: Английский

Citations

52
Near‐Infrared Luminescent Materials Incorporating Rare Earth/Transition Metal Ions: From Materials to Applications DOI

Hua‐Hui Li,

Ya‐Kun Wang, Liang‐Sheng Liao

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(30)

Published: May 11, 2024

Abstract The spotlight has shifted to near‐infrared (NIR) luminescent materials emitting beyond 1000 nm, with growing interest due their unique characteristics. ability of NIR‐II emission (1000–1700 nm) penetrate deeply and transmit independently positions these NIR for applications in optical‐communication devices, bioimaging, photodetectors. combination rare earth metals/transition metals a variety matrix provides new platform creating chemical physical properties science device applications. In this review, the recent advancements activated by transition metal ions are summarized role spanning sensing, optoelectronics is illustrated. It started various synthesis techniques explored how earths/transition can be skillfully incorporated into matrixes, thereby endowing them discussion strategies enhancing excitation absorption efficiency, spotlighting innovations like dye sensitization surface plasmon resonance effects then extended. Subsequently, significant focus placed on functionalization Finally, comprehensive analysis challenges proposed earth/transition ion‐doped materials, summarizing insights each section provided.

Language: Английский

Citations

45
Sol-gel combustion synthesis and near-infrared luminescence of Ni2+-doped MgAl2O4 spinel phosphor DOI
Yu Deng, Yuan Gao, Fengmei Zhu

et al.

Ceramics International, Journal Year: 2024, Volume and Issue: 50(7), P. 12319 - 12325

Published: Jan. 10, 2024

Language: Английский

Citations

31
Energy transfer between two luminous centers and tunable emission of La7Nb3W4O30:Dy3+, Eu3+ DOI
Renping Cao, J. Wang,

Binhui Zhong

et al.

Journal of Physics and Chemistry of Solids, Journal Year: 2024, Volume and Issue: 188, P. 111925 - 111925

Published: Feb. 5, 2024

Language: Английский

Citations

29
Simultaneous NIR Emission and Thermal Stability Enhancement in Garnet‐Type NIR Phosphors through the Synergistic Effect of Lattice Distortion and Enhanced Rigidity DOI
Yining Wang,

Zheng Xu,

Mengmeng Shang

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(10)

Published: May 3, 2024

Abstract Even though there have been significant advancements in the development of Cr 3+ ‐activated near‐infrared (NIR) phosphors, challenge still remains to develop highly efficient and thermally stable NIR phosphors. Here, Ca 4‐x Zn x HfGe 3 O 12 :0.03Cr solid solution phosphors with 834–806 nm emission are constructed by substituting 2+ for , thereby facilitating formation [ZnO 6 ] luminescence site. The coexistence [HfO [Zn/CaO centers is confirmed through DFT calculation, time‐resolved photoluminescence (TRPL) spectroscopy, low‐temperature‐photoluminescence (77 K) spectroscopy. effectively resolves issue lattice mismatch between . Furthermore, simultaneous enhancement intensity thermal stability realized a synergistic combination distortion rigidity enhancement. By optimizing substitution concentration internal quantum efficiency (IQE) 92% an external (EQE) 29% finally achieved. Meanwhile, also enhanced from 59%@400 K (x = 0) 81%@400 0.8). developed phosphor‐converted light‐emitting diodes (pc‐LEDs) exhibit promising prospects fields security, biomedicine, non‐destructive testing rapid identification.

Language: Английский

Citations

20
Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method DOI
Yu Deng, Fengmei Zhu, Yuan Gao

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(14), P. 6555 - 6563

Published: March 26, 2024

Near-infrared (NIR) phosphor conversion light-emitting diodes (pc-LEDs) have great application potential as NIR light sources in many fields such food analysis, night vision illumination, and bioimaging for noninvasive medical diagnosis. In general, phosphors synthesized by a high-temperature solid-phase method large particle sizes to be processed fine powders grinding process, which may introduce surface defects lower the luminous efficiency. Here, we report sol–gel sintering with ammonium nitrate citric acid sacrificing agents synthesize high purity, nanosized (less than 50 nm) Zr4+/Ni2+ codoped MgAl2O4 spinel phosphors, is matrix, Ni2+ center, Zr4+ acts charge compensator. We systematically characterized crystal structures luminescence properties of Ni2+-doped MgAl2O4. Under 390 nm excitation, emission spectrum covers 900–1600 nm, half-peak width 251 peak position located at 1230 nm. demonstrated that incorporating small amounts compensator, intensity was doubled over phosphor. The optimal content compensator 2 mol %. More importantly, inclusion led improved thermal stability properties, measured 100 °C 33.83% room temperature (20 °C). This study demonstrates nanomaterials high-purity enhanced optical can designed through compensation strategy method.

Language: Английский

Citations

17
Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor DOI
Lipeng Jiang, Liangliang Zhang,

Xinpeng Zhao

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(5)

Published: Jan. 8, 2024

Abstract Near‐infrared (NIR) light sources have gained immense popularity in recent years due to their wide range of applications various fields, including spectroscopy and biomedical imaging. However, the limited emission bandwidth NIR phosphors is a significant bottleneck development. Here, novel strategy reported broaden by awakening dumb site. Na 4 M 3 Ta(PO ) 6 : Cr 3+ ( = Al , Ga In phosphor synthesized, which exhibits greatly broadened from 134 232 nm. Structural spectral analysis reveals that NaO octahedral site has severe t 2g ‐type distortion, making it for . By introducing larger at site, angular distortion decreases normal range, enabling luminescence again. Along with bandwidth, peak also redshifts 802 977 nm, giving advantages applications. Interestingly, awakened shows even better properties than original M/TaO These findings reveal insight into could potentially revolutionize design phosphors.

Language: Английский

Citations

16