Investigation of phosphines as potential host materials in blue dye-doped organic light emitting devices

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.

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Chemistry

Grantor dc:publisher

University of Nevada, Las Vegas

Year

2003

Author dc:creator

• DeSilva, Murukkuwadura Aruni

Contributors dc:contributor

• Linda S. Sapochak
• Byron L. Bennett

Statement dc:rights

• IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Language dc:language

English

Identifier

https://oasis.library.unlv.edu/rtds/1530

OAI identifier oai:identifier

oai:oasis.library.unlv.edu:rtds-2529