Scientific Results

Filtered optical feedback in quantum dot light emitting diode

Year: 2018

Authors: Al Naimee K.A.M., Al Husseini H.B., Al Khursan A.H., Abdalah S.F., Meucci R., Arecchi F.T.

Autors Affiliation: Istituto Nazionale di Ottica-CNR, Largo E. Fermi 6, Florence, 50125, Italy; Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq; Nassiriya Nanotechnology Research Laboratory, Thi-Qar University Science College, Nassiriya, 56789, Iraq

Abstract: This research reports a theoretical investigation on the role of filtered optical feedback (FOF) in the quantum dot light emitting diode (QD-LED). The underlying dynamics is affected by a sidle node, which returns to an elliptical shape when the wetting layer (WL) is neglected. Both filter width and time delay change the appearance of different dynamics (chaotic and mixed mode oscillations,MMOs). The results agrees with the experimental observations. Here, the fixed point analysis for QDs was done for the first time. For QD-LED with FOF, the system transits from the coherence collapse (CC) case in conventional optical feedback (COF) to a coherent case with a filtered mode in FOF. It was found that the WL washes out the modes which is an unexpected result. This may attributed to the longer capture time of WL compared with that between QD states. Thus, WL reduces the chaotic behavior.

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KeyWords: Chaos theory; Light emitting diodes; Magnetic materials; Nanocrystals; Optical feedback; Oscillators (mechanical); Semiconductor quantum dots; Superconducting materials, Coherence collapse; Filtered optical feedback; Fixed point analysis; Mixed mode oscillations; Quantum-dot light emitting diodes; Theoretical investigations; Time delay changes; Underlying dynamics, Organic light emitting diodes (OLED)
DOI: 10.4028/www.scientific.net/MSF.915.171