scholarly journals On the role of the atomic bond types in light emission from Si nanoparticles

AIP Advances ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 055109 ◽  
Author(s):  
A. A. González-Fernández ◽  
J. Juvert ◽  
M. Aceves-Mijares ◽  
C. Dominguez-Horna
Keyword(s):  
Light Emission ◽  
Si Nanoparticles

The Enabling Role of Surface Passivation in Visible Photoluminescence from Si Nanoparticles

1993 ◽  
Vol 318 ◽  
Author(s):  
A.A. Seraphin ◽  
E. Werwa ◽  
L.A. Chiu ◽  
K.D. Kolenbrander
Keyword(s):  
Room Temperature ◽  
Surface Passivation ◽  
Light Emission ◽  
Supersonic Expansion ◽  
Expansion Technique ◽  
Si Nanoparticles ◽  
Silicon Nanocrystallites ◽  
Pl Emission ◽  
Si Nanocrystallites

ABSTRACTSilicon nanocrystallites have been studied in a variety of passivating environments to study the role of surface passivation in visible light emission from the particles. Thin films of Si nanocrystallites have been deposited by a laser ablation supersonic expansion technique. The films show significant room temperature photoluminescence (PL) behavior only after processing to achieve surface passivation. Passivation effects on light emission are studied through PL emission spectroscopy on clusters in the gas phase, as well as films in a variety of passivating media. The intensity of PL emission seems to scale with the extent of surface passivation, but the specific nature of the passivating species is not critical in defining the wavelength of emitted light.

The critical role of the coordination sphere in the high-efficiency blue-light emission from aminopyrazine metal-organic polymers

2021 ◽  
Vol 186 ◽  
pp. 109025
Author(s):  
João Humberto Dias Campos ◽  
Meiry Edivirges Alvarenga ◽  
Maykon Alves Lemes ◽  
José Antônio do Nascimento Neto ◽  
Freddy Fernandes Guimarães ◽  
...  
Keyword(s):  
Blue Light ◽  
Coordination Sphere ◽  
High Efficiency ◽  
Light Emission ◽  
Critical Role ◽  
Organic Polymers ◽  
Blue Light Emission ◽  
Metal Organic

scholarly journals THE ORGANIZATION AND INNERVATION OF THE LUMINESCENT ORGAN IN A FIREFLY, PHOTURIS PENNSYLVANICA (COLEOPTERA)

1963 ◽  
Vol 16 (2) ◽  
pp. 323-359 ◽  
Author(s):  
David S. Smith
Keyword(s):  
Electron Microscope ◽  
Synaptic Vesicles ◽  
Light Emission ◽  
Nerve Endings ◽  
Tracheal Epithelium ◽  
Nerve Terminals ◽  
Tracheal System ◽  
Physiological Evidence ◽  
Effector System

The organization of the luminescent organ of an adult firefly has been studied with the electron microscope, and particular attention has been given to the disposition of nerve terminals within the organ. The cytological structure of the cells of the tracheal system, the peripheral and terminal axons, the photocytes and the cells of the dorsal ("reflecting") layer is described. Previous observations on the peripheral course of nerve branches alongside the tracheal trunks at the level of the dorsal layer and photocyte epithelium have been confirmed, and specialised nerve endings containing axoplasmic components structurally identical with "synaptic vesicles" and "neurosecretory droplets" have been identified, not in association with the surface of the photocytes, but lying between the apposed surfaces of two components of the tracheal epithelium: the tracheal end-cell and the tracheolar cell. These cytological findings are discussed in terms of available biochemical and physiological evidence concerning the mechanism of light emission in the firefly, especially with respect to the possible role of chemical "transmitter" action in triggering a response in a luminescent effector system.

Bulk Breakdown in AlGaN/GaN HFETs

1998 ◽  
Vol 512 ◽  
Author(s):  
G. Gradinaru ◽  
N. C. Kao ◽  
R. Gaska ◽  
J. Yang ◽  
Q. Chen ◽  
...  
Keyword(s):  
Light Emission ◽  
Large Range ◽  
Simultaneous Increase ◽  
Gate Current ◽  
Emission Signal ◽  
Multiplication Process ◽  
Breakdown Mechanism ◽  
Carrier Multiplication ◽  
Source Current

ABSTRACTA significant source current generated by a carrier multiplication process is observed at large drain voltages in the subthreshold regime, along with simultaneous increase of the gate current and light emission signal. Provided no on-surface premature breakdown takes place, a bulk channel avalanche breakdown process is proposed as the dominant breakdown mechanism for a large range of gate-to-source dc voltages. This process in the GaN channel is responsible for the excess source and drain currents, light emission, and excess gate current beyond its normal value measured in a gate-to-drain diode configuration. The role of the gate bias in controlling the channel vs. the gate breakdown mechanisms is described.

Nanoconfining solution-processed organic semiconductors for emerging optoelectronics

2021 ◽  
Author(s):  
Yuze Zhang ◽  
Alina Chen ◽  
Min-Woo Kim ◽  
Aida Alaei ◽  
Stephanie S. Lee
Keyword(s):  
Charge Transport ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Light Emission ◽  
Solution Processed ◽  
Semiconductor Crystals

This tutorial review highlights the role of nanoconfinement in selecting for orientations and polymorphs of organic semiconductor crystals that are optimized for optoelectronic processes, including charge transport and light emission.

Visible light emission from Dy3+ doped tellurite glass: Role of silver and titania nanoparticles co-embedment

2018 ◽  
Vol 502 ◽  
pp. 198-209 ◽  
Author(s):  
M.S.A. Mohd Saidi ◽  
S.K. Ghoshal ◽  
K. Hamzah ◽  
R. Arifin ◽  
M.F. Omar ◽  
...  
Keyword(s):  
Visible Light ◽  
Tellurite Glass ◽  
Light Emission ◽  
Titania Nanoparticles ◽  
Visible Light Emission

The role of excitons in 3D and 2D lead halide perovskites

2019 ◽  
Vol 7 (39) ◽  
pp. 12006-12018 ◽  
Author(s):  
Daniela Marongiu ◽  
Michele Saba ◽  
Francesco Quochi ◽  
Andrea Mura ◽  
Giovanni Bongiovanni
Keyword(s):  
Light Emission ◽  
Minority Species ◽  
Halide Perovskites ◽  
Almost All ◽  
Lead Halide

Excitons in lead halide perovskites often go unnoticed as minority species, yet they account for almost all of light emission.

scholarly journals Requirement of the C-terminal proline residue for stability of the Ca2+-activated photoprotein aequorin

1993 ◽  
Vol 293 (1) ◽  
pp. 181-185 ◽  
Author(s):  
N J Watkins ◽  
A K Campbell
Keyword(s):  
Light Emission ◽  
Specific Activity ◽  
In Vitro Transcription ◽  
Wild Type ◽  
Proline Residue ◽  
Long Term Stability ◽  
Recombinant Aequorin

cDNA coding for the Ca(2+)-activated photoprotein aequorin from the jellyfish Aequorea victoria has been engineered to investigate the role of the C-terminal proline residue in bioluminescence. Recombinant aequorin proteins were synthesized by PCR followed by in vitro transcription/translation, and characterized by specific activity, stability, and affinity for coelenterazine. The C-terminal proline residue of aequorin was shown to be essential for the long-term stability of the bound coelenterazine. Aequorin minus proline had only 1% of the specific activity of the wild-type after 2 h, and was virtually inactive after 18 h. The instability of this variant was further demonstrated by re-activating with a coelenterazine analogue (epsilon-coelenterazine), where maximum reactivation was reached in 15 min, and the luminescent activity was almost completely abolished within 3 h. Replacement of the C-terminal proline residue with histidine or glutamic acid decreased the specific activity to 10 and 19% of that of the wild-type respectively. However these variants were also unstable, having t1/2 values of 2.4 h and 2.3 h respectively. Enhancement of the Ca(2+)-independent light emission when proline was replaced by histidine confirmed the stabilizing role of the C-terminal proline. No significant effect of removal of the C-terminal proline was detected on the affinity for coelenterazine.

scholarly journals Monte Carlo Simulations of High Field Transport in Electroluminescent Devices

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 401-405
Author(s):  
Manfred Dür ◽  
Stephen M. Goodnick ◽  
Martin Reigrotzki ◽  
Ronald Redmer
Keyword(s):  
Band Structure ◽  
High Field ◽  
Light Emission ◽  
Essential Element ◽  
Impact Excitation ◽  
Field Energy ◽  
Pseudopotential Calculations ◽  
Full Band ◽  
Full Band Structure

High field transport in phosphor materials is an essential element of thin film electroluminescent device performance. Due to the high accelerating fields in these structures (1–3 MV/cm), a complete description of transport under high field conditions utilizing information on the full band structure of the material is critical to understand the light emission process due to impact excitation of luminescent impurities. Here we investigate the role of band structure for ZnS, GaN, and SrS based on empirical pseudopotential calculations to study its effect on the high field energy distribution of conduction band electrons.

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