Alternating-current thin-film electroluminescent device physics and modeling Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5138jh34b

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  • Alternating-current thin-film electroluminescent (ACTFEL) devices are used in the formation of pixels in flat panel displays. ACTFEL flat panel displays have many advantages over other flat panel technologies. Specifically, ACTFEL panels are emissive displays, they have high brightness, wide viewing angles, and rugged construction. Although much is already known about the operation of ACTFEL devices, several topics related to the device physics and modeling of these devices require further research. In this work, existing ACTFEL device models are refined by expanding the understanding of ACTFEL device physics and operation. Modeling is separated into three levels of increasing complexity as follows; (1) equivalent circuit modeling, (2) device physics or electrostatic modeling, or (3) Monte Carlo modeling. Each level of model is addressed in this thesis. Existing equivalent circuit models are empirically refined to account for device response to variations in the shape of the driving waveform pulse. The device physics model is expanded by presenting evidence for the formation of space charge in the phosphor layer and the equations prescribing device response are modified accordingly. Also, a new technique for measuring the distribution of interface states in ACTFEL devices is presented. This gives new insight into device operation, as the interface state distribution is one of the most difficult parameters to estimate/measure in the device physics model. Finally, an experiment is presented which attempts to measure the maximum energy of hot electrons during conduction in the phosphor. This research leads to a recommendation of the complexity of the conduction band model needed for accurate Monte Carlo simulation of ACTFEL devices.
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