Enhanced Mechanically Induced Red-light Emission Novel Mechanoluminescence Material for Ultrasonic Visualization and Monitoring Application

2021 ◽  
Author(s):  
Yu-Ting Fan ◽  
Zhi-Jun Zhang ◽  
Yun-Ling Yang ◽  
Ting Li ◽  
Jia-Yong Yuan ◽  
...  
Keyword(s):  
Light Emission ◽  
Red Light ◽  
Biological Imaging ◽  
Stress Detection ◽  
Fluorescent Material ◽  
Potential Applications ◽  
Monitoring Application

Mechanoluminescent (ML) materials have become a novel and excellent fluorescent material in the field of luminescence for demonstrating potential applications in stress detection, biological imaging and optical displays. Through some...

scholarly journals Hydrothermal Synthesis and Optical Properties of Magneto-Optical Na3FeF6:Tb3+ Octahedral Particles

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 320
Author(s):  
Zhiguo Zhao ◽  
Xue Li
Keyword(s):  
Light Emission ◽  
Red Light ◽  
Hydrothermal Process ◽  
Functional Materials ◽  
Rare Earth Ions ◽  
Monoclinic Crystal ◽  
One Pot ◽  
Monoclinic Crystal Structure ◽  
Micro Particles ◽  
Potential Applications

Sodium iron hexafluoride (Na3FeF6), as a colorless iron fluoride, is expected to be an ideal host for rare earth ions to realize magneto-optical bi-functionality. Herein, monodispersed terbium ions (Tb3+) doped Na3FeF6 particles are successfully synthesized by a facile one-pot hydrothermal process. X-ray diffraction (XRD) and Field emission scanning electron microscopy (FESEM) reveal that the Tb3+ doped Na3FeF6 micro-particles with regular octahedral shape can be assigned to a monoclinic crystal structure (space group P21/c). Under ultraviolet light excitation, the Na3FeF6:Tb3+ octahedral particles given orange-red light emission originated from the 5D4→7FJ transitions of the Tb3+ ions. In addition, the magnetism measurement indicates that Na3FeF6:Tb3+ octahedral particles are paramagnetic with high magnetization at room temperature. Therefore, the Na3FeF6:Tb3+ powders may find potential applications in the biomedical field as magnetic-optical bi-functional materials.

scholarly journals Incommensurately Modulated Crystal Structure and Photoluminescence Properties of Eu2O3- and P2O5-Doped Ca2SiO4 Phosphor

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 58
Author(s):  
Hiromi Nakano ◽  
Shota Ando ◽  
Konatsu Kamimoto ◽  
Yuya Hiramatsu ◽  
Yuichi Michiue ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Light Emission ◽  
Red Light ◽  
Basic Unit ◽  
Β Phase ◽  
Stacking Order ◽  
Cell Dimensions ◽  
Incommensurate Modulation ◽  
Unit Cell Dimensions ◽  
Identical Chemical Composition

We prepared four types of Eu2O3- and P2O5-doped Ca2SiO4 phosphors with different phase compositions but identical chemical composition, the chemical formula of which was (Ca1.950Eu3+0.013☐0.037)(Si0.940P0.060)O4 (☐ denotes vacancies in Ca sites). One of the phosphors was composed exclusively of the incommensurate (IC) phase with superspace group Pnma(0β0)00s and basic unit-cell dimensions of a = 0.68004(2) nm, b = 0.54481(2) nm, and c = 0.93956(3) nm (Z = 4). The crystal structure was made up of four types of β-Ca2SiO4-related layers with an interlayer. The incommensurate modulation with wavelength of 4.110 × b was induced by the long-range stacking order of these layers. When increasing the relative amount of the IC-phase with respect to the coexisting β-phase, the red light emission intensity, under excitation at 394 nm, steadily decreased to reach the minimum, at which the specimen was composed exclusively of the IC-phase. The coordination environments of Eu3+ ion in the crystal structures of β- and IC-phases might be closely related to the photoluminescence intensities of the phosphors.

Morphology Evolution and Luminescence Properties of YF3: Sm Nano-/Microcrystals

2012 ◽  
Vol 463-464 ◽  
pp. 112-118
Author(s):  
Feng Tao ◽  
Geng Zhu ◽  
Zhi Jun Wang ◽  
Feng Pan ◽  
Yu Feng Sun ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Growth Mechanism ◽  
Room Temperature ◽  
Red Light ◽  
Environmentally Friendly ◽  
Morphology Evolution ◽  
Flat Panel Display ◽  
Flat Panel ◽  
Display Devices ◽  
Potential Applications

Abstract. Recently, there has been increasting interest in the doping of nano-/microcrystal hosts with Sm3+. However, very few examples of Sm3+doped YF3-based nanophosphors have been reported. In this paper, a variety of uniform YF3:Sm nano-/microcrystals have been successfully prepared by a facile, effective, and environmentally friendly hydrothermal method. The morphology evolution process has been investigated by quenching the reaction at different time. Based on the results, a possible growth mechanism is presented in detail. The as-obtained YF3:Sm nano-/microcrystals show strong yellow and red light emissions under room temperature, which is quite different from those reported previously and might find potential applications in fields such as light phosphor powers and advanced flat panel display devices.

First-principles identification of VI+Cui defect cluster in cuprous iodide: origin of red light photoluminescence

2022 ◽  
Author(s):  
Dingrong Liu ◽  
Zenghua Cai ◽  
Yu-Ning Wu ◽  
Shiyou Chen
Keyword(s):  
First Principles ◽  
Light Emission ◽  
Red Light ◽  
Defect Cluster ◽  
Intrinsic Point Defect ◽  
Long Wavelength ◽  
Type Semiconductor ◽  
Display Technology ◽  
Wavelength Emission ◽  
P Type

Abstract The γ-phase Cuprous Iodide (CuI) emerges as a promising transparent p-type semiconductor for next-generation display technology because of its wide direct band gap, intrinsic p-type conductivity, and high carrier mobility. Two main peaks are observed in its photoluminescence (PL). One is short wavelength (410-430 nm) emission, which is well attributed to the electronic transitions at Cu vacancy, whereas the other long wavelength emission (680-720 nm) has not been fully understood. In this paper, through first-principles simulations, we investigate the formation energies and emission line shape for various defects, and discover that the intrinsic point defect cluster V_I+Cu_i^(2+) is the source of the long wavelength emission. Our finding is further supported by the prediction that the defect concentration decreases dramatically as the chemical condition changes from Cu-rich to I-rich, explaining the significant reduction in the red light emission if CuI is annealed in abundant I environment.

Blue, Green, and Red Light Emission of 1,8-Carbazole-based Conjugated Polymers

2010 ◽  
Vol 39 (3) ◽  
pp. 168-169 ◽  
Author(s):  
Tsuyoshi Michinobu ◽  
Haruka Osako ◽  
Kimie Murata ◽  
Kiyotaka Shigehara
Keyword(s):  
Conjugated Polymers ◽  
Light Emission ◽  
Red Light

PHOTOLUMINESCENCE OF NON-CRYSTALLINE ALUMINA NANOWIRES SYNTHESIZED BY DIRECT ANODIZATION OF ALUMINUM

2009 ◽  
Vol 23 (14) ◽  
pp. 1819-1825
Author(s):  
JAYA SARKAR ◽  
GOBINDA GOPAL KHAN ◽  
A. BASUMALLICK
Keyword(s):  
Light Emission ◽  
Pure Aluminum ◽  
Bath Temperature ◽  
Constant Current ◽  
X Ray Diffraction ◽  
Constant Current Density ◽  
X Ray ◽  
Anodization Process ◽  
Potential Applications ◽  
Crystalline Alumina

Alumina nanowires have been synthesized by a simple electrochemical route, by tailoring the anodization process of aluminum. Two-stage anodization of pure aluminum foils were carried out in 0.3 M oxalic acid electrolyte by maintaining a constant current density of 250 A/m2 and suitably controlling the other anodization parameters: anodization voltage, bath temperature and anodization time. The fabricated alumina nanowires were investigated by field-emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Moreover, the X-ray diffraction (XRD) study on the prepared nanowires shows that they are non-crystalline in nature. The photoluminescence (PL) spectra of alumina nanowires exhibit two stable emission bands at 438 and 581 nm. The blue luminescence behavior of the alumina nanowires are attributed to the oxygen-deficient defect centers. PL study of alumina nanowires shows that they have potential applications in light emission devices.

High-Efficiency Red-Light Emission from Polyfluorenes Grafted with Cyclometalated Iridium Complexes and Charge Transport Moiety

2003 ◽  
Vol 125 (3) ◽  
pp. 636-637 ◽  
Author(s):  
Xiwen Chen ◽  
Jin-Long Liao ◽  
Yongmin Liang ◽  
M. O. Ahmed ◽  
Hao-En Tseng ◽  
...  
Keyword(s):  
Charge Transport ◽  
High Efficiency ◽  
Light Emission ◽  
Red Light ◽  
Iridium Complexes

Carbon dots with efficient solid-state red-light emission through the step-by-step surface modification towards light-emitting diodes

2018 ◽  
Vol 47 (11) ◽  
pp. 3811-3818 ◽  
Author(s):  
Jinyang Zhu ◽  
Xue Bai ◽  
Xu Chen ◽  
Zhifeng Xie ◽  
Yongsheng Zhu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Solid State ◽  
Carbon Dots ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Red Light ◽  
Light Emitting

Carbon dots with efficient solid-state red-light emission through step-by-step surface modification.

Facile synthesis of yellow fluorescent carbon dots for highly sensitive sensing of cobalt ions and biological imaging

2019 ◽  
Vol 11 (32) ◽  
pp. 4077-4083 ◽  
Author(s):  
Min Tian ◽  
Yaoming Liu ◽  
Yingte Wang ◽  
Yong Zhang
Keyword(s):  
Light Emission ◽  
Biological Imaging ◽  
Cobalt Ions ◽  
Long Wavelength ◽  
Scattering Effects ◽  
Highly Sensitive ◽  
Penetration Ability ◽  
Weak Light ◽  
Fluorescent Carbon Dots ◽  
Wavelength Light

Long-wavelength light emission has been garnering extensive attention in terms of strong tissue penetration ability and weak light scattering effects.

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