Systematic investigation of the effects of organic film structure on light emitting diode performance

1996 ◽  
Vol 80 (5) ◽  
pp. 2883-2890 ◽  
Author(s):  
M. D. Joswick ◽  
I. H. Campbell ◽  
N. N. Barashkov ◽  
J. P. Ferraris
Keyword(s):  
Light Emitting Diode ◽  
Systematic Investigation ◽  
Film Structure ◽  
Organic Film ◽  
Light Emitting

Polymer Layer Ordering of Polyaniline Derivatives in Pled Devices: Surface Adsorption and Characterization

1997 ◽  
Vol 488 ◽  
Author(s):  
R. C. Advincula ◽  
W. Knoll ◽  
C. W. Frank ◽  
D. Roitman ◽  
R. Moon ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Deposition Process ◽  
Film Structure ◽  
Hole Injection ◽  
Polyelectrolyte Adsorption ◽  
Light Emitting ◽  
Linear Behavior ◽  
Structure Morphology ◽  
Vis Spectroscopy ◽  
Oppositely Charged

AbstractThe fabrication and characterization of polyaniline (PANI) derivatives deposited on ITO coated glass is investigated as possible hole injection layers for MEH-PPV based polymer light emitting diode (PLED) devices. This involved multilayer ordering by the alternate polyelectrolyte adsorption of polyaniline and sulfonated poyaniline with an oppositely charged polyelectrolyte from solution. A combination of spectroscopic and microscopic techniques was utilized to determine the layer ordering, film structure, morphology, and homogeneity. The deposition process generally showed a linear behavior for all pairs as shown by ellipsometry and UV-vis spectroscopy. However, surface plasmon spectroscopy (SPS) and AFM revealed that thicker films are accompanied by increased surface roughness regardless of concentration. Comparison in performance was made between bare ITO and PANI or SPANI coated devices. Initial investigations of PLED performance showed significant improvements in lifetime and efficiency compared to bare ITO.

Fabrication of a Homojunction Light Emitting Diode with ZnO-Nanorods∕ZnO:As-Film Structure

2012 ◽  
Vol 15 (5) ◽  
pp. H164 ◽  
Author(s):  
Jingchang Sun ◽  
Jiming Bian ◽  
Yan Wang ◽  
Yuxin Wang ◽  
Yu Gong ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Zno Nanorods ◽  
Film Structure ◽  
Light Emitting

scholarly journals Antifibrotic activity of Hypocrellin A united LED red light irradiation on Keloid Fibroblasts through counteracting TGF-β/Smad/autophagy/apoptosis signaling pathway

2020 ◽  
Author(s):  
Tianhui Niu ◽  
Yan Tian ◽  
Ying Shi ◽  
Guangjin Guo ◽  
Ying Tong ◽  
...  
Keyword(s):  
Signaling Pathway ◽  
Light Emitting Diode ◽  
Red Light ◽  
Systematic Investigation ◽  
Light Irradiation ◽  
Light Emitting ◽  
Hypocrellin A ◽  
Keloid Fibroblast ◽  
Smad Signaling Pathway ◽  
Tgf Β1

Abstract Keloid disease is characterized by abnormal proliferation of fibroblast and continuous deposition of extracellular matrix (ECM) components. More and more attention in dermopathic is paid to photodynamic therapy (PDT) with visible light. The natural photosensitizer Hypocrellin A (HA) is identified to develop a splendid light induced anticancer, antimicrobial and antiviral activity. In this experiment, we investigated the impacts of HA united light-emitting diode (LED) red light irradiation on human keloid fibroblast cells (KFs). Our results showed that HA united red light irradiation treatment (HA-R-PDT) decreased KFs viability, reduced KFs collagen production and ECM accumulation, inhibited cell proliferation, suppressed cell invasion and induced cell apoptosis. Moreover, our observations demonstrated that TGF-β/Smad signaling pathway and autophagy were restrained by HA-R-PDT. TGF-β1 could accommodate autophagy in KFs through both Smad and ERK pathway, while inhibiting autophagy could mediate TGF-β1 level by the negative feedback. Therefore, HA-R-PDT could suppress cell hyper-proliferation, collagen synthesis and ECM accumulation in KFs via regulating TGF-β1-ERK-autophagy-apoptosis signaling pathway. HA-R-PDT deserves systematic investigation as a potential therapeutic strategy for keloid treatment and autophagy might be a promising candidate in the therapy of KFs.

Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

2020 ◽  
pp. 144-148
Keyword(s):  
Quantum Dot ◽  
Delay Time ◽  
Chaos Synchronization ◽  
Optical Feedback ◽  
Light Emitting Diode ◽  
Feedback Effect ◽  
Complete Synchronization ◽  
Light Emitting ◽  
Coupling Methods ◽  
Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

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