Browsing by Author "Abiyasa, A.P."

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    AC-driven, color-and brightness-tunable organic light-emitting diodes constructed from an electron only device
    (2013) Zhao, Y.; Chen, R.; Gao, Y.; Leck, K.S.; Yang X.; Liu, S.; Abiyasa, A.P.; Divayana, Y.; Mutlugun, E.; Tan, S.T.; Sun H.; Demir, Hilmi Volkan; Sun X.W.
    In this paper, a color- and brightness-tunable organic light-emitting diode (OLED) is reported. This OLED was realized by inserting a charge generation layer into an electron only device to form an n-i-p-i-n structure. It is shown that, by changing the polarity of applied voltage, only the p-i-n junction operated under positive bias can emit light and, by applying an AC voltage, emission from both junctions was realized. It is also shown that, by using a combination of blue- and red-emiting layers in two p-i-n junctions, both the color and brightness of the resulting white OLED can be tuned independently by changing the positive and negative amplitudes of the AC voltage. © 2013 Elsevier B.V. All rights reserved.
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    Nanocrystal LEDs with enhanced external quantum efficiency enabled by the use of phosphorescent molecules
    (IEEE, 2013) Mutlugün, Evren; Abiyasa, A.P.; Güzeltürk, Burak; Gao, Y.; Leck, K.S.; Sun X.W.; Demir, Hilmi Volkan
    We report efficiency enhancement in quantum dot (QD) based LEDs with the aid of excitonic energy transfer from co-doped TCTA:Ir(ppy)3 layer to CdSe/ZnS QDs while providing spectrally pure emission. © 2013 IEEE.