Electro-optical characterization of SrS:Ce, SrS:Cu, and SrS:Cu,Ag alternating-current thin-film electroluminescent devices Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zg64tp22d

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  • The purpose of this thesis is to contribute to the understanding of SrS-based alternating-current thin-film electroluminescent (ACTFEL) device operation. Three main accomplishments serving this purpose are presented in this thesis. First, two new methods are developed for estimation of insulator capacitance in ACTFEL devices possessing a large amount of dynamic space charge. Both insulator capacitance estimation methods employ applied voltage waveforms with long pulses (e.g. rise time, pulse width, and fall time of 200 μs). Second, SrS:Ce ACTFEL device capacitance-voltage (C-V) and internal charge-phosphor field (Q[subscript int]- F[subscript p]) characteristics are simulated using a two-sheet space charge model which assumes that phosphor space charge is localized at two planes parallel to the ACTFEL device phosphor-insulator interfaces. The two-sheet space charge model allows for realistic simulation of most charge and field parameters in a SrS:Ce ACTFEL device. However, in its present formulation, the two-sheet space charge model fails to explain the large experimentally observed phosphor field overshoot, turn-on voltage, and capacitance overshoot in SrS:Ce ACTFEL devices. Third, electro-optic characteristics of SrS:Ce, SrS:Cu, and SrS:Cu,Ag ACTFEL devices are compared. SrS:Ce (SrS:Cu,Ag) ACTFEL devices have the highest (lowest) luminance and luminous efficiency and are also the deepest green (blue); SrS:Cu ACTFEL devices are intermediate with regard to luminance, efficiency, and chromaticity. Space charge-related effects are observed in all of the ACTFEL devices studied. These effects are asymmetrical with respect to the applied voltage polarity. This asymmetry is more pronounced in SrS:Ce ACTFEL devices and is consistent with more space charge generation occurring near the bottom, ITO phosphor-insulator interface when electron injection occurs from here. For SrS:Cu and SrS:Cu,Ag ACTFEL devices, it is found that the emission wavelength slightly decreases with increasing maximum applied voltage.
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