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Polymeric light-emitting diodes utilizing TPD-dispersed polyimide thin film and organometallic complex

1998; SPIE; Volume: 3281; Linguagem: Inglês

10.1117/12.305439

1996-756X

Hyuntaek Lim, Hyunjoo Park, Jae-Gyoung Lee, Youngkyoo Kim, Won‐Jei Cho, Chang‐Sik Ha,

Synthesis and properties of polymers

The polymeric light-emitting diodes (PLEDs) in the present work consist of a double layer organic structure, i.e. ITO/hole transport material (HTM)-dispersed polymer/emitter/cathode. Fully aromatic polyimide, poly(4,4'- oxydiphenylene pyromellitimide) (PMDA-ODA PI), with outstanding thermal stability and high glass transition temperature of 377 degrees Celsius was introduced as a matrix polymer for binding the HTM. N,N'-diphenyl-N,N'-di(m- tolyl)benzidine (TPD) and bis(8-hydroxyquinolinato)zinc(II) (Znq2) were used as a HTM and an emitter, respectively. The turn-on voltage was ca. 7 V. Bright greenish yellow light was observed at 11 V under room light.