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

2,7-Carbazole-Based Conjugated Polymers for Blue, Green, and Red Light Emission

2002 ◽  
Vol 35 (22) ◽  
pp. 8413-8417 ◽  
Author(s):  
Jean-François Morin ◽  
Mario Leclerc
Keyword(s):  
Conjugated Polymers ◽  
Light Emission ◽  
Red Light

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.

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.

scholarly journals Enhancing near-infrared photoluminescence from single-walled carbon nanotubes by defect-engineering using benzoyl peroxide

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lukasz Przypis ◽  
Maciej Krzywiecki ◽  
Yoshiaki Niidome ◽  
Haruka Aoki ◽  
Tomohiro Shiraki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Conjugated Polymers ◽  
Near Infrared ◽  
Light Emission ◽  
Single Walled Carbon Nanotubes ◽  
Organic Radical ◽  
Defect Engineering ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Selection Of

AbstractSingle-walled carbon nanotubes (SWCNTs) have been modified with ester groups using typical organic radical chemistry. Consequently, traps for mobile excitons have been created, which enhanced the optical properties of the material. The proposed methodology combines the benefits of mainstream approaches to create luminescent defects in SWCNTs while it simultaneously avoids their limitations. A step change was achieved when the aqueous medium was abandoned. The selection of an appropriate organic solvent enabled much more facile modification of SWCNTs. The presented technique is quick and versatile as it can engage numerous reactants to tune the light emission capabilities of SWCNTs. Importantly, it can also utilize SWCNTs sorted by chirality using conjugated polymers to enhance their light emission capabilities. Such differentiation is conducted in organic solvents, so monochiral SWCNT can be directly functionalized using the demonstrated concept in the same medium without the need to redisperse the material in water.

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.

Synthesis of fluorescent conjugated polymer nanoparticles and their immobilization on a substrate for white light emission

2018 ◽  
Vol 9 (48) ◽  
pp. 5671-5679 ◽  
Author(s):  
Choongho Kim ◽  
Young Jin Gwon ◽  
Jongho Kim ◽  
Taek Seung Lee
Keyword(s):  
Conjugated Polymers ◽  
White Light ◽  
Conjugated Polymer ◽  
Light Emission ◽  
Coupling Reaction ◽  
Suzuki Coupling ◽  
Polymer Nanoparticles ◽  
Red Emission ◽  
Suzuki Coupling Reaction ◽  
Conjugated Polymer Nanoparticles

Fluorescent conjugated polymers (CPs) for blue, green, and red emission were polymerized via the Suzuki coupling reaction.

scholarly journals Bis-Tridendate Ir(III) Polymer-Metallocomplexes: Hybrid, Main-Chain Polymer Phosphors for Orange–Red Light Emission

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2976
Author(s):  
Konstantinos Andrikopoulos ◽  
Charalampos Anastasopoulos ◽  
Joannis K. Kallitsis ◽  
Aikaterini K. Andreopoulou
Keyword(s):  
Main Chain ◽  
Light Emission ◽  
Red Light ◽  
Molecular Complexes ◽  
Hydroxyl Groups ◽  
Iridium Complexes ◽  
Light Emitters ◽  
Chain Polymer ◽  
Molecular Weights ◽  
Pyridine Moiety

In this work, hybrid polymeric bis-tridentate iridium(III) complexes bearing derivatives of terpyridine (tpy) and 2,6-di(phenyl) pyridine as ligands were successfully synthesized and evaluated as red-light emitters. At first, the synthesis of small molecular bis-tridendate Ir(III) complexes bearing alkoxy-, methyl-, or hydroxy-functionalized terpyridines and a dihydroxyphenyl-pyridine moiety was accomplished. Molecular complexes bearing two polymerizable end-hydroxyl groups and methyl- or alkoxy-decorated terpyridines were copolymerized with difluorodiphenyl-sulphone under high temperature polyetherification conditions. Alternatively, the post-polymerization complexation of the terpyridine-iridium(III) monocomplexes onto the biphenyl-pyridine main chain homopolymer was explored. Both cases afforded solution-processable metallocomplex-polymers possessing the advantages of phosphorescent emitters in addition to high molecular weights and excellent film-forming ability via solution casting. The structural, optical, and electrochemical properties of the monomeric and polymeric heteroleptic iridium complexes were thoroughly investigated. The polymeric metallocomplexes were found to emit in the orange–red region (550–600 nm) with appropriate HOMO and LUMO levels to be used in conjunction with blue-emitting hosts. By varying the metal loading on the polymeric backbone, the emitter’s specific emission maxima could be successfully tuned.

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