Silver(i) nanoclusters of carbazole-1,8-bis(acetylide): from visible to near-infrared emission

2019 ◽  
Vol 55 (44) ◽  
pp. 6281-6284 ◽  
Author(s):  
Xu Zhang ◽  
Jin-Yun Wang ◽  
Ya-Zi Huang ◽  
Ming Yang ◽  
Zhong-Ning Chen
Keyword(s):  
Near Infrared ◽  
Infrared Emission ◽  
Red Shift ◽  
Infrared Luminescence ◽  
Stepwise Increase ◽  
Near Infrared Emission

High-nuclearity silver(i) nanoclusters of carbazole-1,8-bis(acetylide) exhibit visible to near-infrared luminescence and gradual emission spectral red-shift with the stepwise increase of cluster nuclearity following Ag8 → Ag16 → Ag29.

Exceptional modulation of upconversion and downconversion near-infrared luminescence in Tm/Yb-codoped ferroelectric nanocomposite by nanoscale engineering

Nanoscale ◽  
2019 ◽  
Vol 11 (24) ◽  
pp. 11642-11648 ◽  
Author(s):  
Er Pan ◽  
Gongxun Bai ◽  
Jun Zhou ◽  
Lei Lei ◽  
Shiqing Xu
Keyword(s):  
Near Infrared ◽  
Infrared Emission ◽  
Infrared Luminescence ◽  
Near Infrared Emission

Exceptional enhancement in both upconversion and downconversion near-infrared emission has been realized in the developed ferroelectric photonic nanocomposite.

Strong Near-Infrared Luminescence from NiSi2-Passivated Silicon Nanocrystals Embedded in SiOx Films

2007 ◽  
Vol 336-338 ◽  
pp. 655-657 ◽  
Author(s):  
Ying He ◽  
K. Ma ◽  
L. Bi ◽  
Jia You Feng ◽  
Q.L. Wu
Keyword(s):  
Amorphous Silicon ◽  
Silicon Nanocrystals ◽  
Near Infrared ◽  
Annealing Temperature ◽  
Infrared Emission ◽  
Maximum Intensity ◽  
Photoluminescence Emission ◽  
Infrared Luminescence ◽  
Passivated Silicon ◽  
Near Infrared Emission

In this paper, we have investigated the near-infrared luminescence emitting from NiSi2 passivated silicon nanocrystals (NCs) embedded in SiOx films. For comparison, we also prepared the regular specimen without NiSi2 passivation. In the both systems, the intensity of photoluminescence emission from NC-Si increased with the increase of annealing temperature, which was explained by the crystallization of amorphous silicon in SiOx films. The maximum intensity of near-infrared emission from NiSi2-passivated NC-Si was stronger by factor 5 than that of regular specimen without NiSi2 passivation. The model of NiSi2 passivation was employed to explain this phenomenon.

Preparation, growth mechanism, size manipulation and near-infrared luminescence enhancement of β-NaYF4:Nd3+ microcrystals via Ca2+ doping

CrystEngComm ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 741-748 ◽  
Author(s):  
Qinqin Shao ◽  
Hong Zhang ◽  
Jiangyun Dai ◽  
Chao Yang ◽  
Xiaoxu Chen ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Emission Intensity ◽  
Near Infrared ◽  
Infrared Emission ◽  
Luminescence Enhancement ◽  
Infrared Luminescence ◽  
Near Infrared Emission

The near-infrared emission intensity of NaYF4:3% Nd3+ doped with 20 mol% Ca2+ is 3 times that of the Ca2+-free samples.

Near-Infrared Luminescence and Energy Transfer Characteristics of Dy3+-Tm3+ Co-Doped Selenide Glasses

2007 ◽  
Vol 336-338 ◽  
pp. 647-650
Author(s):  
Zhi Yong Yang ◽  
Lan Luo ◽  
Wei Chen
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Direct Interaction ◽  
Infrared Emission ◽  
Emission Properties ◽  
Diffusion Limited ◽  
Infrared Luminescence ◽  
Near Infrared Emission ◽  
Energy Acceptor ◽  
Co Doped

Near-infrared emission properties of Dy3+-Tm3+ co-doped Ge-Ga-Sb-Se glasses were investigated. Possible energy transfer routes and the regime of donor decay were discussed. Tm3+ is found to be an efficient sensitizer on the Dy3+:1.34μm luminescence. Probable energy transfer schemes include Tm3+:3H4 → Dy3+: 6F5/2 and Tm3+:3H5 → Dy3+:6F11/2· 6H9/2. The donor (Tm3+) excitation is transferred to an acceptor (Dy3+) by direct interaction or migrates among donors by diffusion-limited regime until it comes into the vicinity of an energy acceptor where direct interaction and transfer occur.

scholarly journals Broadband Near-Infrared Luminescence in Lead Germanate Glass Triply Doped with Yb3+/Er3+/Tm3+

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2901
Author(s):  
Wojciech A. Pisarski ◽  
Joanna Pisarska ◽  
Radosław Lisiecki ◽  
Witold Ryba-Romanowski
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Infrared Emission ◽  
Relaxation Processes ◽  
Lead Germanate ◽  
Germanate Glass ◽  
Transfer Processes ◽  
Infrared Luminescence ◽  
Near Infrared Emission ◽  
Co Doped

This paper deals with broadband near-infrared luminescence properties of lead germanate glass triply doped with Yb3+/Er3+/Tm3+. Samples were excited at 800 nm and 975 nm. Their emission intensities and lifetimes depend significantly on Er3+ and Tm3+ concentrations. For samples excited at 800 nm, broadband emissions corresponding to the overlapped 3H4 → 3F4 (Tm3+) and 4I13/2 → 4I15/2 (Er3+) transitions centered at 1.45 µm and 1.5 µm was identified. Measurements of decay curves confirm reduction of 3H4 (Tm3+), 2F5/2 (Yb3+) and 4I13/2 (Er3+) luminescence lifetimes and the presence of energy-transfer processes. The maximal spectral bandwidth equal to 269 nm for the 3F4 → 3H6 transition of Tm3+ suggests that our glass co-doped with Yb3+/Er3+/Tm3+ is a good candidate for broadband near-infrared emission. The energy transfer from 4I13/2 (Er3+) to 3F4 (Tm3+) and cross-relaxation processes are responsible for the enhancement of broadband luminescence near 1.8 µm attributed to the 3F4 → 3H6 transition of thulium ions in lead germanate glass under excitation of Yb3+ ions at 975 nm.

Energy transfer and enhanced broadband near-infrared luminescence in Yb–Bi codoped phosphate glasses

2009 ◽  
Vol 24 (2) ◽  
pp. 516-519 ◽  
Author(s):  
Jian Ruan ◽  
Botao Wu ◽  
Danping Chen ◽  
Yanbo Qiao ◽  
Jianrong Qiu
Keyword(s):  
Energy Transfer ◽  
Emission Intensity ◽  
Near Infrared ◽  
Infrared Emission ◽  
Phosphate Glasses ◽  
Promising Candidate ◽  
Optical Amplification ◽  
Infrared Luminescence ◽  
Doped Glass ◽  
Near Infrared Emission

In this article, we report on enhanced broadband near-infrared emission in Yb–Bi codoped phosphate glasses. The emission intensity of Yb–Bi codoped glass was ˜32 times larger than that of Bi-doped glass when excited with 980-nm laser diode. The highest 1/e fluorescent lifetime of Yb–Bi codoped glass reached 1650 μs. The dependence of emission intensity and fluorescent lifetime on Yb2O3 concentration was investigated. The enhancement of the near-infrared emission is due to energy transfer from Yb3+ (2F5/2–2F7/2) transition to Bi ions, and the highest energy transfer efficiency reached 50%. Yb–Bi codoped phosphate glass should be a promising candidate for broadband optical amplification.

Temperature-dependent broadband near-infrared luminescence in silicate glass ceramics containing Li2MgSiO4: Cr4+ nanocrystals

2010 ◽  
Vol 25 (9) ◽  
pp. 1833-1837 ◽  
Author(s):  
Yixi Zhuang ◽  
Jiajia Zhou ◽  
Junhua Xie ◽  
Yu Teng ◽  
Jianrong Qiu
Keyword(s):  
Fluorescence Lifetime ◽  
Near Infrared ◽  
Glass Ceramics ◽  
Infrared Emission ◽  
Temperature Dependent ◽  
Energy Level Scheme ◽  
Mixed Effect ◽  
Infrared Luminescence ◽  
Doped Glass ◽  
Near Infrared Emission

Transparent glass ceramics containing Li2MgSiO4: Cr4+ nanocrystallites were prepared. Intense broadband near-infrared emission with full width at half-maximum larger than 200 nm and long fluorescence lifetime (τ > 100 μs) were observed. The temperature-dependent optical characteristics of the glass ceramics containing Li2MgSiO4: Cr4+ crystallites were compared to those of Li2MgSiO4: Cr4+ single crystals. The reason for extra-long near-infrared fluorescence lifetime was illuminated by the mixed effect between 3T2 and 1E levels. The crystal-filed-induced particular energy-level scheme makes the fluorescence lifetime of the glass ceramics containing Li2MgSiO4: Cr4+ crystallites one order longer than those of other Cr4+-doped glass ceramics.

Core-mediated synthesis, growth mechanism and near-infrared luminescence enhancement of α-NaGdF4@β-NaLuF4:Nd3+ core–shell nanocrystals

CrystEngComm ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 1359-1367 ◽  
Author(s):  
Qinqin Shao ◽  
Chao Yang ◽  
Xiaoxu Chen ◽  
Hong Zhang ◽  
Guoying Feng ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Emission Intensity ◽  
High Performance ◽  
Near Infrared ◽  
Infrared Emission ◽  
Core Shell ◽  
Luminescence Enhancement ◽  
Infrared Luminescence ◽  
Near Infrared Emission

High-performance α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals have been constructed based on a core-mediated method. Their near-infrared emission intensity was eventually enhanced by more than 2 times.

scholarly journals Amphiprotism-Coupled Near-Infrared Emission in Extended Pyrazinacenes Containing Seven Linearly Fused Pyrazine Units

2019 ◽  
Vol 141 (50) ◽  
pp. 19570-19574 ◽  
Author(s):  
Gary J. Richards ◽  
Aël Cador ◽  
Shinji Yamada ◽  
Anna Middleton ◽  
Whitney A. Webre ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Emission ◽  
Near Infrared Emission

Broadband near-infrared emission of K3ScF6:Cr3+ phosphors for night vision imaging system sources

2021 ◽  
Vol 417 ◽  
pp. 129271
Author(s):  
Haojun Yu ◽  
Jian Chen ◽  
Ruiyu Mi ◽  
Juyu Yang ◽  
Yan-gai Liu
Keyword(s):  
Near Infrared ◽  
Imaging System ◽  
Infrared Emission ◽  
Night Vision ◽  
Near Infrared Emission
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