Doctor of Philosophy (PhD)
Organic Light Emitting Diodes (OLEDs) are predicted to revolutionize next generation consumer electronics by offering many advantageous device characteristics, including low power consumption, low heat dissipation, a tunable and wider color gamut, high resolution and contrast, light weight, flexibility, and semi-transparency. However, a major limiting factor for OLEDs to reach their full potential is that only a few known blue OLED emitters with substantial spectral purity and longevity are available to date. Therefore, focus of this research is on understanding and addressing limitations of OLED emitters, with an emphasis on improving the characteristics of blue emitters.
The work presented in this dissertation includes understanding structure-property relationships of OLED blue emitters using four structurally related pyrenylpyridines as model compounds (chapter 2), applying these structure-property relationship concepts to synthesize three novel blue emitters derived from pyrene-benzimidazole conjugates with substantially improved spectral properties (chapter 3), as well as synthesizing and characterizing propidium luminophore (3,8-diamino-5-[3-(diethylmethylammonio)propyl]-6-phenylphenanthridinium dication) based GUMBOS (group of uniform materials based on organic salts) to evaluate how these GUMBOS materials can be applied to address the aforementioned limitations of OLED emitters. A number of analytical tools were applied to study the characteristics of these compounds, including morphology, spectroscopy, photothermal stability, and electrochemistry. Also, OLED prototypes were fabricated and characterized with selected compounds to understand the luminance, current, and power relationships of these materials.
De Silva, Thenahandi Prasanthi Deepthika, "Photo-Physical Properties of Novel GUMBOS for Optoelectronic Applications" (2019). LSU Doctoral Dissertations. 4913.
Warner, Isiah M.