ASU Electronic Theses and Dissertations
- 2 English
- 2 Public
Light Emitting Diodes even with their longer life, robust build and low power consumption, they are still plagued by some problems the most significant of which are the current droop and thermal droop. Current droop causes a lowering in the Internal Quantum Efficiency with increased current injection while thermal droop lowers the whole Internal Quantum Efficiency curve with increase in temperature. The focus here was understanding effects of thermal droop and develop a method to control it. Shockley Read Hall recombination plays a dominant role in the thermal droop effect when the current injection is low. Since the blue light …
- Das, Shiladitya, Zhao, Yuji, Vasileska, Dragica, et al.
- Created Date
This dissertation aims to study and understand the effect of nonlinear dynamics and quantum chaos in graphene, optomechanics, photonics and spintronics systems. First, in graphene quantum dot systems, conductance fluctuations are investigated from the respects of Fano resonances and quantum chaos. The conventional semi-classical theory of quantum chaotic scattering used in this field depends on an invariant classical phase-space structure. I show that for systems without an invariant classical phase-space structure, the quantum pointer states can still be used to explain the conductance fluctuations. Another finding is that the chaotic geometry is demonstrated to have similar effects as the disorders …
- Wang, Guanglei, Lai, Ying-Cheng, Vasileska, Dragica, et al.
- Created Date