Master of Science (MS)
First Committee Member
Linda S. Sapochak
Second Committee Member
Byron L. Bennett
Number of Pages
Currently, the most efficient organic light emitting devices (OLEDs) are based on dye-doped OLEDs. The major obstacle has been developing a host material for blue OLEDs that has sufficiently high energy of emission (<380nm) to facilitate energy transfer to the dye. Previous studies of bis(diphenylphosphino)-E-Stilbene (P-STIL) suggested that tertiary aromatic diphosphines (TAPs) may be suitable candidates. Therefore, the P-containing materials, 4,4'-bis(naphthylphenylphosphino)biphenyl (alpha-P-NPD) and 4,4'-bis(diphenylphosphino)biphenyl (P-DDB) were synthesized and the photophysical properties were evaluated and compared to P-STIL. The TAPs were shown to be sensitive to air oxidation both in solution and the solid state and that the origin of the high energy emission of P-STIL was from the oxide. Furthermore, all TAPs were shown to exhibit dual emission, which may result from different structural geometries about the P-atom in the excited state. Theses studies conclusively demonstrate that TAPs are not suitable as host materials fro blue dye-doped OLEDs, but the fully oxidized materials, which are more stable and emit at higher energy may be better candidates.
Blue; Devices; Doped; Dye; Emitting; Host; Investigation; Light; Materials; Organic; Phosphines; Potential
University of Nevada, Las Vegas
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DeSilva, Murukkuwadura Aruni, "Investigation of phosphines as potential host materials in blue dye-doped organic light emitting devices" (2003). UNLV Retrospective Theses & Dissertations. 1530.