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

Tunable Spinel Structure Phosphors: Dynamic Change in Near‐Infrared Windows and Their Applications DOI
Wen‐Tse Huang, Kuan‐Chun Chen,

Ming‐Hsuan Huang

et al.

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(23)

Published: July 26, 2023

Abstract Applications in near‐infrared (NIR) have been explored significantly many fields, including bioimaging, night vision, plant growth, and chemical analysis. Different emission profiles are required within the same industry. Developing luminescent materials with different tuning methods is reliable for controlling NIR regions (NIR‐I, 700–1000 nm; NIR‐II, 1000–1700 nm). Spinel phosphors promising candidates due to their ability modulate crystal field. Understanding parameters that influence degree of inversion spinel compounds crucial harness variability structure. Cr 3+ Ni 2+ ideal activators NIR‐I NIR‐II emissions, respectively. However, there a need emit region when excited by visible light. Although energy transfer method combining two considered, this review focuses on types structures, discussing common strategies tune host The goal achieve desired shift broadness entire spectrum, highlighting importance spectrum practical applications.

Language: Английский

Citations

41
Long-Wavelength Near-Infrared Divalent Nickel-Activated Double-Perovskite Ba2MgWO6 Phosphor as Imaging for Human Fingers DOI

Xirui Lu,

Yuan Gao, Jiayuan Chen

et al.

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(33), P. 39472 - 39479

Published: Aug. 8, 2023

Transmission near-infrared (NIR) imaging technology has great potential for biomedical because of its lower water absorption coefficient and highly reduced photon scattering effect in biological tissues compared to visible light. The extent tissue is inversely proportional wavelength; therefore, principle, with long-wavelength NIR helps improve the resolution optical image, but deep high-resolution luminescence still very challenging technically. Here, we report discovery a Ba2MgWO6:Ni2+ double perovskite phosphor that emits broadband (1200-2000 nm) under 365 nm near-ultraviolet (UV) excitation, full width at half-maximum 255 nm. quantum efficiency optimized composition reached 16.67%. analysis crystal structure suggests Ni2+ ions preferentially occupy W6+ site octahedrons weak field, which leads large Stokes shift. An as-prepared pc-LED device was built by packaging an low-power near-UV-LED chip, tested generate clear venous vessels human fingers. These unique properties makes it promising application field sources body tissue..

Language: Английский

Citations

37
Unraveling Luminescent Energy Transfer Pathways: Futuristic Approach of Miniature Shortwave Infrared Light-Emitting Diode Design DOI
Veeramani Rajendran, Kuan‐Chun Chen, Wen‐Tse Huang

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(5), P. 2395 - 2400

Published: April 26, 2023

Phosphor-converted shortwave infrared phosphor light-emitting diodes (pc-SWIR LEDs, 900–1700 nm) are promising next-generation portable light sources for spectroscopy, security, optical communication, and medical applications. A typical design strategy involves energy transfer from Cr3+ to Ni2+, thus, Cr3+–Cr3+ pairs Ni2+ ions is important but challenging. Here, we report a Sr1–xLaxAl5.92Cr0.08Ga6–xO19:xNi2+ (x = 0–0.09) series the SWIR emissions range of 900–1600 nm due an pair Ni2+. Short-range structural studies using electron paramagnetic resonance magnetometry measurements reveal that likely exist as isolated Cr3+–Ni2+ rather than forming Ni2+–Ni2+ pairs. The fabricated prototype pc-LED delivers radiant flux 12.43 mW under 350 mA driving current. This work provides insights into codopant phosphors.

Language: Английский

Citations

33
Boosting broadband short-wave infrared emission to achieve near-unity quantum efficiency via bridging Cr3+–Ni2+ in spinel solid-solutions towards light-emitting diode applications DOI
Geng Chen, Lifang Yuan,

Chaoyue Peng

et al.

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(9), P. 4214 - 4221

Published: Jan. 1, 2024

Cr 3+ and Ni 2+ codoped Mg 0.5 Zn Ga 2 O 4 SWIR phosphor exhibits a broadband emission centered at 1304 nm with FWHM of 250 nm, achieving near-unity internal quantum efficiency (IQE = 97.7%) good thermal stability (70.7%@423 K).

Language: Английский

Citations

15
Color-tunable photoluminescence and energy transfer properties of single-phase Sr2MgSi2O7:Eu3+, Dy3+ DOI
Renping Cao,

Ya Cao,

Yongtong Rong

et al.

Journal of Materials Science Materials in Electronics, Journal Year: 2024, Volume and Issue: 35(16)

Published: June 1, 2024

Language: Английский

Citations

14
Ultrahigh Quantum Efficiency Near-Infrared-II Emission Achieved by Cr3+ Clusters to Ni2+ Energy Transfer DOI Creative Commons
Chih‐Yu Chang,

Ming-Hsuan Huang,

Kuan‐Chun Chen

et al.

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(8), P. 3941 - 3948

Published: April 12, 2024

Increasing demand for near-infrared-II (NIR-II) light sources requires improved NIR-II phosphors. We present a series of phosphors codoped with Cr3+ and Ni2+ that possess emission an unprecedented internal quantum efficiency (IQE) 97.4%. Our study reveals energy transfer mechanism involving clusters where luminescent centers are closely matched in the intensity can be tuned through sintering temperature. The profound electron paramagnetic resonance (EPR) studies disclose interaction between Cr3+–Ni2+ pairs, further proving cause such high IQE significance clusters. This work provides promising pathways development light-emitting diodes outstanding by suggesting new source Cr3+.

Language: Английский

Citations

13
Blue‐Light‐Excitable Broadband Ca3Ga2Ge3O12:Cr3+,Ni2+ Phosphor for the Applications in NIR‐II Window DOI
Fangyi Zhao,

Yuhe Shao,

Quanlin Liu

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: June 11, 2024

Abstract 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 non‐destructive detection and medical diagnostics fields. However, development of efficient NIR‐II phosphors that can be excited by commercial blue LED chips remains a significant challenge, thus impeding pc‐LED. Herein, blue‐light‐excitable broadband luminescence Ni 2+ is achieved upon incorporating Cr 3+ into Ca 3 Ga 2 Ge O 12 (CGGO) host simultaneously. Through energy transfer from to , CGGO:Cr ,Ni phosphor presents improved emission peaking at 1470 nm under 460 excitation. The internal/external quantum efficiency values are significantly 13.8%/3.3% 24.6%/13.3% along with enhanced thermal stability. Finally, pc‐LED fabricated combining 450 chip, its potential examination biomedical imaging fields been demonstrated. strategy co‐doping solves problem cannot effectively provides design insights exploit more ultra‐broadband pc‐LEDs based on chips.

Language: Английский

Citations

13
Cr3+ activated Na3RESi3O9 (RE = Y, Lu, Sc) silicate broadband near-infrared phosphors for luminescence towards NIR-II region via a multi-site occupancy strategy DOI

Jiantong Wang,

Changshuai Gong,

Sihan Yang

et al.

Journal of Rare Earths, Journal Year: 2024, Volume and Issue: 42(8), P. 1447 - 1457

Published: May 21, 2024

Language: Английский

Citations

10
Ultra-broad Near-Infrared Emitting Phosphor LiInF4: Cr3+with Extremely Weak Crystal Field DOI
Liping Song, Sisi Liang,

Wendong Nie

et al.

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(28), P. 11112 - 11120

Published: July 3, 2023

Recent decades have witnessed a major development in broadband near-infrared (NIR)-emitting phosphors because of their potential applications real-time nondestructive examination. These require the emission spectra to be as broad possible for efficient performance. Therefore, blue-light excited LiInF4: Cr3+ phosphor with NIR covering 700-1400 nm is successfully synthesized. Under 470 excitation, it shows peaked at 980 full-width half maximum 210 nm. The structure and crystal field environment are investigated detail, possesses weak strength strong electron-phonon coupling. An phosphor-converted light-emitting diode (pc-LED) fabricated by prepared commercial blue chip, generating radiant flux 5.54 mW 150 mA drive current. Finally, pc-LED applied identify blood vessel distribution hand. This work suggests applications.

Language: Английский

Citations

22
Efficient and ultra-broadband Cr3+/Ni2+ co-doped phosphors for light-emitting diodes with spectral output over NIR-I and NIR-II regions DOI

Qianyi Jia,

Leqi Yao,

Shijie Yu

et al.

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(32), P. 11046 - 11054

Published: Jan. 1, 2023

A blue-light excitable near-infrared (NIR) MgGa 2 (O,F) 4 :Cr 3+ ,Ni 2+ phosphor is developed, which exhibits an ultrabroad NIR emission from 700 to 1500 nm and internal quantum efficiency of up 83.3%.

Language: Английский

Citations

19