Long wavelength emission on relaxed InGaN substrates (Conference Presentation)

2017 ◽  
Author(s):  
Armelle Even ◽  
Gautier Laval ◽  
Olivier Ledoux ◽  
Pierre Ferret ◽  
David Sotta ◽  
...  
Keyword(s):  
Long Wavelength ◽  
Wavelength Emission

Influence of solvent polarity on the dual fluorescence of p-N,N-dimethylaminobenzonitrile: An AM1 theoretical study

1990 ◽  
Vol 55 (8) ◽  
pp. 1891-1895 ◽  
Author(s):  
Peter Ertl
Keyword(s):  
Excited State ◽  
Theoretical Study ◽  
Solvent Polarity ◽  
Semiempirical Method ◽  
Dual Fluorescence ◽  
Long Wavelength ◽  
Polar Media ◽  
Wavelength Emission ◽  
Ground State Geometry ◽  
Influence Of Solvent

Twisting of the NMe2 group in p-N,N-dimethylaminobenzonitrile (DMABN) was investigated using AM1 semiempirical method with configuration interaction. Effect of polar media was considered by placing + and - charge centers ("sparkles") at appropriate places opposite the molecule. Optimized ground state geometry of DMABN is slightly twisted with the lowest vertical excited state of 1B character. As the polarity of media increases and/or the - NMe2 group twists, the symmetric 1A excited state having considerable charge separation becomes energetically favorable. Anomalous long-wavelength emission of DMABN comes from this state.

Controllable supramolecular chain aggregation through nano-steric hindrance functionalization for multi-color larger-area electroluminescence

2018 ◽  
Vol 6 (26) ◽  
pp. 7018-7023 ◽  
Author(s):  
Man Xu ◽  
Wei-Biao Wang ◽  
Lu-Bing Bai ◽  
Meng-Na Yu ◽  
Ya-Min Han ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
Device Performance ◽  
Effective Strategy ◽  
Long Wavelength ◽  
Wavelength Emission ◽  
Supramolecular Chain

Suppression of hierarchical chain aggregationvianano-steric hindrance functionalization is an effective strategy to restrain long-wavelength emission and improving the device performance.

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.

Löschung der Perylen-Fluoreszenz durch Ag+ -Ionen / Quenching of the Perylene Fluorescence by Ag+-Ions

1983 ◽  
Vol 38 (6) ◽  
pp. 698-700 ◽  
Author(s):  
H. Dreeskamp ◽  
A. Läufer ◽  
M. Zander
Keyword(s):  
Triplet State ◽  
Dynamic Process ◽  
Aromatic Compounds ◽  
Heavy Atom ◽  
Silver Ions ◽  
Intersystem Crossing ◽  
Fluid Solution ◽  
Long Wavelength ◽  
Wavelength Emission ◽  
Atom Effect

The fluorescence of perylene in fluid solution (λ0.0 = 440 nm) is quenched by silver ions in a dynamic process according to a Stern-Volmer kinetics (kq = 2 · 109 [1 • mol-1 · sec-1], in ethanol at 295 K). Simultaneously an unstructured long-wavelength emission (λmax ≈ 470 nm) appears which we assign to a perylene/Ag+ exciplex. A similar emission is observed when other polvcyclic aromatic compounds (PAC) are used, whose fluorescence as in the case of perylene is not easily quenched in an external heavy atom effect by iodopropane (kq ≦ 106). In these cases the excited PAC/Ag+ complex is long-lived enough to emit fluorescence since the intersystem crossing to the triplet system is slow due to the absence of an energetically favorable accepting triplet state

The development of a hemicyanine-based ratiometric CO fluorescent probe with a long emission wavelength and its applications for imaging CO in vitro and in vivo

2020 ◽  
Vol 44 (28) ◽  
pp. 12107-12112 ◽  
Author(s):  
Yunyan Zhang ◽  
Xiuqi Kong ◽  
Yonghe Tang ◽  
Min Li ◽  
Yaguang Yin ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Living Cells ◽  
Emission Wavelength ◽  
Long Wavelength ◽  
Wavelength Emission ◽  
Ratiometric Fluorescent Probe

A novel ratiometric fluorescent probe, Hcy-CO, with long-wavelength emission was developed for visualizing CO in living cells and zebrafish.

The effects of quantum dot coverage in InAs/(In)GaAs nanostructures for long wavelength emission

2009 ◽  
Vol 40 (3) ◽  
pp. 465-468 ◽  
Author(s):  
G. Trevisi ◽  
L. Seravalli ◽  
P. Frigeri ◽  
M. Prezioso ◽  
J.C. Rimada ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Long Wavelength ◽  
Wavelength Emission

Long-wavelength emission in InGaAsN/GaAs heterostructures with quantum wells

2000 ◽  
Vol 26 (5) ◽  
pp. 443-445
Author(s):  
B. V. Volovik ◽  
A. R. Kovsh ◽  
W. Passenberg ◽  
H. Kuenzel ◽  
N. N. Ledentsov ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Long Wavelength ◽  
Wavelength Emission

Molecular beam epitaxial growth window for high-quality (Ga,In)(N,As) quantum wells for long wavelength emission

2006 ◽  
Vol 88 (19) ◽  
pp. 191115 ◽  
Author(s):  
Fumitaro Ishikawa ◽  
Michael Höricke ◽  
Uwe Jahn ◽  
Achim Trampert ◽  
Klaus H. Ploog
Keyword(s):  
Quantum Wells ◽  
Epitaxial Growth ◽  
Molecular Beam ◽  
High Quality ◽  
Long Wavelength ◽  
Molecular Beam Epitaxial ◽  
Wavelength Emission ◽  
Molecular Beam Epitaxial Growth
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