scholarly journals Confining energy migration in upconversion nanoparticles towards deep ultraviolet lasing

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Xian Chen ◽  
Limin Jin ◽  
Wei Kong ◽  
Tianying Sun ◽  
Wenfei Zhang ◽  
...  
Keyword(s):  
Energy Migration ◽  
Upconversion Nanoparticles ◽  
Deep Ultraviolet

scholarly journals Anisotropic Energy Migration: An Excitation Navigating Energy Migration of Lanthanide Ions in Upconversion Nanoparticles (Adv. Mater. 9/2020)

2020 ◽  
Vol 32 (9) ◽  
pp. 2070068
Author(s):  
Zhendong Lei ◽  
Xiao Ling ◽  
Qingsong Mei ◽  
Shuai Fu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Energy Migration ◽  
Lanthanide Ions ◽  
Upconversion Nanoparticles ◽  
Anisotropic Energy

Energy Migration Engineering of Bright Rare-Earth Upconversion Nanoparticles for Excitation by Light-Emitting Diodes

2015 ◽  
Vol 27 (41) ◽  
pp. 6418-6422 ◽  
Author(s):  
Yeteng Zhong ◽  
Iman Rostami ◽  
Zihua Wang ◽  
Hongjie Dai ◽  
Zhiyuan Hu
Keyword(s):  
Rare Earth ◽  
Light Emitting Diodes ◽  
Energy Migration ◽  
Upconversion Nanoparticles ◽  
Light Emitting

808 nm excited energy migration upconversion nanoparticles driven by a Nd3+–Trinity system with color-tunability and superior luminescence properties

Nanoscale ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 2790-2803 ◽  
Author(s):  
Shuai Guo ◽  
Ming-Kiu Tsang ◽  
Wai-Sum Lo ◽  
Jianhua Hao ◽  
Wing-Tak Wong
Keyword(s):  
Energy Migration ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles ◽  
Heating Effects ◽  
Color Tunability

A novel nanostructure is fabricated with an 808 nm excited/Nd3+-sensitized EMU system to avoid over-heating effects, gained with favourable luminescence properties.

An Excitation Navigating Energy Migration of Lanthanide Ions in Upconversion Nanoparticles

2020 ◽  
Vol 32 (9) ◽  
pp. 1906225 ◽  
Author(s):  
Zhendong Lei ◽  
Xiao Ling ◽  
Qingsong Mei ◽  
Shuai Fu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Energy Migration ◽  
Lanthanide Ions ◽  
Upconversion Nanoparticles

The influence of energy migration on luminescence kinetics parameters in upconversion nanoparticles

2016 ◽  
Vol 28 (3) ◽  
pp. 035401 ◽  
Author(s):  
Sergey Alyatkin ◽  
Ilya Asharchuk ◽  
Kirill Khaydukov ◽  
Andrey Nechaev ◽  
Oleg Lebedev ◽  
...  
Keyword(s):  
Energy Migration ◽  
Upconversion Nanoparticles ◽  
Kinetics Parameters ◽  
Luminescence Kinetics

Ultrasmall-Superbright Neodymium-Upconversion Nanoparticles via Energy Migration Manipulation and Lattice Modification: 808 nm-Activated Drug Release

ACS Nano ◽  
2017 ◽  
Vol 11 (3) ◽  
pp. 2846-2857 ◽  
Author(s):  
Yan Zhang ◽  
Zhongzheng Yu ◽  
Jingqiu Li ◽  
Yanxiao Ao ◽  
Jingwen Xue ◽  
...  
Keyword(s):  
Drug Release ◽  
Energy Migration ◽  
Upconversion Nanoparticles

Construction of a near-infrared responsive upconversion nanoplatform against hypoxic tumors via NO-enhanced photodynamic therapy

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Near Infrared ◽  
Upconversion Nanoparticles

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.

Novel organic, polymeric materials for electronics applications

2002 ◽  
Vol 722 ◽  
Author(s):  
Ram W. Sabnis ◽  
Mary J. Spencer ◽  
Douglas J. Guerrero
Keyword(s):  
Optical Density ◽  
Chemical Vapor ◽  
Polymeric Materials ◽  
Substantial Improvement ◽  
Polymeric Systems ◽  
Patterned Wafers ◽  
Visible Spectra ◽  
Potential Applications ◽  
Deep Ultraviolet ◽  
Deposited Films

AbstractNovel organic, polymeric materials and processes of depositing thin films on electronics substrates by chemical vapor deposition (CVD) have been developed and the lithographic behavior of photoresist coated over these CVD films at deep ultraviolet (DUV) wavelength has been evaluated. The specific monomers synthesized for DUV applications include [2.2](1,4)- naphthalenophane, [2.2](9,10)-anthracenophane and their derivatives which showed remarkable film uniformity on flat wafers and conformality over structured topography wafers, upon polymerization by CVD. The chemical, physical and optical properties of the deposited films have been characterized by measuring parameters such as thickness uniformity, solubility, conformality, adhesion to semiconductor substrates, ultraviolet-visible spectra, optical density, optical constants, defectivity, and resist compatibility. Scanning electron microscope (SEM) photos of cross-sectioned patterned wafers showed verticle profiles with no footing, standing waves or undercut. Resist profiles down to 0.10 νm dense lines and 0.09 νm isolated lines were achieved in initial tests. CVD coatings generated 96-100% conformal films, which is a substantial improvement over commercial spin-on polymeric systems. The light absorbing layers have high optical density at 248 nm and are therefore capable materials for DUV lithography applications. CVD is a potentially useful technology to extend lithography for sub-0.15 νm devices. These films have potential applications in microelectronics, optoelectronics and photonics.

Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6

2019 ◽  
Author(s):  
Young-Kwang Jung ◽  
Joaquin Calbo ◽  
Ji-Sang Park ◽  
Lucy D. Wahlley ◽  
Sunghyun Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Stokes Shift ◽  
Green Luminescence ◽  
Counter Ions ◽  
Self Consistent ◽  
Deep Ultraviolet ◽  
Halide Perovskite ◽  
Related Compounds ◽  
Level Analysis

Cs<sub>4</sub>PbBr<sub>6 </sub>is a member of the halide perovskite family that is built from isolated (zero-dimensional) PbBr<sub>6</sub><sup>4-</sup> octahedra with Cs<sup>+</sup> counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310 - 375 nm) with efficient luminescence in the green region (~ 540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs<sub>4</sub>PbBr<sub>6</sub>. We find a heavily compensated system where the room-temperature carrier concentrations (< 10<sup>9</sup> cm<sup>-3</sup>) are more than one million times lower than the defect concentrations. We show that the low-energy Br-on-Cs antisite results in the formation of a polybromide (Br<sub>3</sub>) species that can exist in a range of charge states. We further demonstrate from excited-state calculations that tribromide moieties are photoresponsive and can contribute to the observed green luminescence. Photoactivity of polyhalide molecules is expected to be present in other halide perovskite-related compounds where they can influence light absorption and emission. <br>

Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6

2019 ◽  
Author(s):  
Young-Kwang Jung ◽  
Joaquin Calbo ◽  
Ji-Sang Park ◽  
Lucy D. Wahlley ◽  
Sunghyun Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Stokes Shift ◽  
Green Luminescence ◽  
Counter Ions ◽  
Self Consistent ◽  
Deep Ultraviolet ◽  
Halide Perovskite ◽  
Related Compounds ◽  
Level Analysis

Cs<sub>4</sub>PbBr<sub>6 </sub>is a member of the halide perovskite family that is built from isolated (zero-dimensional) PbBr<sub>6</sub><sup>4-</sup> octahedra with Cs<sup>+</sup> counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310 - 375 nm) with efficient luminescence in the green region (~ 540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs<sub>4</sub>PbBr<sub>6</sub>. We find a heavily compensated system where the room-temperature carrier concentrations (< 10<sup>9</sup> cm<sup>-3</sup>) are more than one million times lower than the defect concentrations. We show that the low-energy Br-on-Cs antisite results in the formation of a polybromide (Br<sub>3</sub>) species that can exist in a range of charge states. We further demonstrate from excited-state calculations that tribromide moieties are photoresponsive and can contribute to the observed green luminescence. Photoactivity of polyhalide molecules is expected to be present in other halide perovskite-related compounds where they can influence light absorption and emission. <br>

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