Enhancement and stability of luminescence in thin-film light-emitting devices based on heterostructure of ladder-type poly (p-phenylene)

✍ Scribed by S.X. Wang; W.L. Wang; K.J. Liao; C.Z. Cai

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 101 KB
• Volume: 5
• Category: Article
• ISSN: 1369-8001
• DOI: 10.1016/s1369-8001(02)00053-7

✦ Synopsis

The microcavity thin-film light-emitting devices were fabricated, which use two organic material layers, ladder-type poly(p-phenylene) (LPPP) and (8-hydroxyquimalin) aluminum (Alq 3 ), sandwiched between two injecting electrodes. With the ribbon-type macromolecule structure, the LPPP exhibits higher thermal and chemical stability than its linear analog. The broad photoluminescence (PL) and electroluminescence (EL) emission means LPPP can be tuned over the full visible region. LPPP was the emitting layer and the cavity transporter. Alq 3 was the electron transporter. The investigation on EL and PL properties of the devices indicated that the microcavity effect has been achieved by adjusting the thickness of organic light-emitting layers. The experimental results showed that directional emission and net emission were efficiently enhanced. The heavily born-doped diamond electrode in place of the metal electrode aluminum can also greatly improve the stability of the devices.