Sharp-to-Broad Band Energy Transfer in Lithium Aluminate and Gallate Phosphors for SWIR LED DOI Creative Commons
Yi‐Ting Tsai,

Pei-Xuan Chen,

Mikołaj Kamiński

et al.

ACS Applied Optical Materials, Journal Year: 2024, Volume and Issue: 2(12), P. 2401 - 2408

Published: March 1, 2024

Short-wave infrared (SWIR) phosphor-converted light-emitting diode (LED) technology holds promise for advancing broadband light sources. Despite the potential, limited research has delved into energy transfer mechanism from sharp-line to emission in SWIR phosphors, which remains underexplored. Herein, we demonstrate bright phosphors achieved through Cr

Language: Английский

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
Photoluminescence Tuning of Stable CaYGaO4: Bi/Eu via Compositional Modulation and Crystallographic Site Engineering for nUV wLEDs DOI
Chang Wang,

Z.C. Yao,

Yifeng Lei

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(34), P. 16056 - 16069

Published: Aug. 12, 2024

The olivine-based gallate CaYGaO4 (CYG) with unique cationic ordering, rich lattice sites, and self-photoluminescence (PL) is suitable for application as a host of phosphor. However, research in this area still its early stages, especially high-quality full-spectrum white lighting. Herein, novel CYG: Bi3+/Eu3+ controllable PL property designed based on energy transfer superposition emissions from blue self-PL, Bi3+, red-PL Eu3+. Intriguingly, intensity quantum efficiency could be enhanced via codoping Li+/Zn2+ separately/simultaneously because their two intentional functions both charge balancer flux. Unlike self- Eu3+ PL, Bi3+ quite sensitive to the environment owing exposed 6s2 electronic configuration tuned Sr2+ regulate nephelauxetic effect crystal field splitting concurrently around Bi3+. Meanwhile, further regulating obtaining "warm" light, La3+ codoped into phosphor crystallographic site engineering control substitution trends at distinct sites. Finally, proof-of-concept, phosphor-converted white-light-emitting diode device under nUV pumping remarkable color rendering index (Ra), high luminous efficiency, chemical/thermal stability achieved by utilizing individual CYG:Bi/Eu/Li/Zn/Sr/La remote "capping" packaging method.

Language: Английский

Citations

8
Abnormal spectral broadening of ordered-structure near-infrared phosphor La2CaHfO6:Cr3+ DOI
Yulei Zhao, Xudong Wang,

Qihao Wang

et al.

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(28), P. 10532 - 10539

Published: Jan. 1, 2024

Near-infrared (NIR) phosphors play a key role in the preparation of NIR phosphor-converted light-emitting diodes (NIR pc-LEDs) for night vision, sensing and non-destructive detection, but how to search broadband still remains big challenge.

Language: Английский

Citations

7
Hydrothermal and anion exchange synthesis of Mn(v)-doped Ba5(PO4)3Cl nano-apatite toward NIR-II temperature sensing DOI
Wenjing Huang, Jiahui Zhang, Yuchuan Zheng

et al.

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(24), P. 10261 - 10269

Published: Jan. 1, 2024

Mn 5+ -doped Ba 5 (PO 4 ) 3 Cl nano-apatite with NIR-II luminescence is made by a two-step (hydrothermal and anion exchange) method. This nanophosphor can serve as nanothermometer in the window high sensitivity.

Language: Английский

Citations

7
Thermal Enhancement of Er3+ NIR‐II Luminescence by Ho3+‐Mediated Energy‐Trapping in Negative Thermal Expansion Nanocrystals DOI

Jiaoyin Zhao,

Jiwen Chang,

Nan Wang

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(11)

Published: June 19, 2024

Abstract Thermal quenching of luminescence materials poses a major obstacle to the technological application thermometry. It still remains challenging attain thermally enhanced light emissions, especially in second near‐infrared window (NIR‐II). Herein, an anomalous thermal dependence NIR‐II negative expansion (NTE) Sc 2 Mo 3 O 12 :Er 3+ /Ho nanocrystals is reported. Mechanistic investigations affirm that Ho ion can work as energy reservoir and back‐transfer Er with assistance lattice phonon at elevated temperatures. Moreover, ‐mediated feedback strengthened by contraction between dopant ions, thereby enabling remarkable enhancement emission over 11‐fold. The opposite response emissions harnessed for ratiometric thermometry, registering exceptional performance high‐temperature regime ( S r = 1.71% K −1 , δT 0.2 513 K). These findings may inspire new insights addressing luminescence, which also raises exciting opportunities flexible thermometry complex settings.

Language: Английский

Citations

7
Crystal Field-Engineered Cr3+-Doped Gd3(MgxGa5–2xGex)O12 Phosphors for Near-Infrared LEDs and X-ray Imaging Applications DOI

Tianlong Zeng,

Ping Liu, Guo‐Qiang Zeng

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(28), P. 12886 - 12893

Published: July 1, 2024

Inorganic materials doped with chromium (Cr) ions generate remarkable and adjustable broadband near-infrared (NIR) light, offering promising applications in the fields of imaging night vision technology. However, achieving high efficiency thermal stability these NIR phosphors poses a significant challenge for their practical application. Here, we employ crystal field engineering to modulate characteristics Cr3+-doped Gd3Ga5O12 (GGG). The Gd3MgxGa5–2xGexO12 (GMGG):7.5% Cr3+ (x = 0, 0.05, 0.15, 0.20, 0.40) emission are developed through cosubstitution Mg2+ Ge4+ Ga3+ sites. This strategy also effectively reduces strength around ions, which results enhancement photoluminescence (PL) full width at half-maximum (fwhm) from 97 165 nm, alongside red shift PL peak an intensity up 2.3 times. Notably, behaviors is improved. demonstrate potential biological tissue penetration vision, as well exceptional scintillation performance scintillator imaging. research paves new perspective on development high-performance technology light-emitting diodes (LEDs) X-ray applications.

Language: Английский

Citations

7
A novel thermally-stable red phosphor CaYGaO4:Eu3+ for WLEDs and anti-counterfeiting ink DOI
Ying–Jun Angela Zhang, Ruirui Cui, Xiang Guo

et al.

Ceramics International, Journal Year: 2024, Volume and Issue: 50(22), P. 45094 - 45104

Published: Aug. 22, 2024

Language: Английский

Citations

6
Energy-Transfer-Enhanced Cr3+/Ni2+ Co-doped Broadband Near-Infrared Phosphor for Fluorescence Thermometers and Near-Infrared Window Imaging DOI
Yi Zhang,

Zhexuan Gao,

Yinyan Li

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(42), P. 57316 - 57324

Published: Oct. 11, 2024

Here, near-infrared broad dual-band emission phosphors were achieved through energy transfer between Cr3+ and Ni2+ ions in the β-Ga2O3 host. All samples co-doped with exhibit covering 600–1700 nm under 430 excitation. Thanks to doping of ions, intensity Ga2O3:Cr3+, has increased by about 2.4 times internal quantum efficiency 83.2% compared Ga2O3:Ni2+ phosphors. Meanwhile, when fluorescence lifetime was monitored at 745 nm, an efficient host verified. Due significant differences temperature-sensitive properties a thermometer designed utilizing ratio technology, achieving maximum relative sensitivity 5.26% K–1, which surpasses most optical temperature measurement This suggests that hold promise as potential candidates for materials. Additionally, broadband sample been investigated applications component analysis night vision, demonstrating its versatility multifunctional applications.

Language: Английский

Citations

5
Efficient Sr2Ta2O7:Bi3+,Ln3+ (Ln3+ = Eu3+,Sm3+) phosphors for optical thermometry and anti-counterfeiting DOI
Xin Wang, Shuai Wei,

Zeyu Lyu

et al.

Journal of Materials Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A series of novel optical thermometers with an optimal relative sensitivity 2.98% K −1 were designed based on the luminescence Bi 3+ and Ln ions different temperature sensitivities.

Language: Английский

Citations

0
Zero-thermal-quenching broadband NIR-II emitting Mg4Nb2O9: Ni2+ phosphor via defective engineering and multi-site occupation DOI
Hua Yu,

Zhexuan Gao,

Huanping Wang

et al.

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 179519 - 179519

Published: March 1, 2025

Language: Английский

Citations

0