Polyimide/Polyimide Double Layer Structured Light-Emitting Diodes and their Characteristics

Hyuntaek Lim Department of Polymer Science and Engineering, Pusan National University, Pusan, 609-735, Korea

Hyunjoo Park Department of Polymer Science and Engineering, Pusan National University, Pusan, 609-735, Korea

Jae-Gyoung Lee Electronic Materials Research Lab., Institute for Advanced Engineering, Daewoo Group, Yongin P.O.Box 25, Kyonggi-do, 449-800, Korea

Youngkyoo Kim Electronic Materials Research Lab., Institute for Advanced Engineering, Daewoo Group, Yongin P.O.Box 25, Kyonggi-do, 449-800, Korea

Won-jeicho Department of Polymer Science and Engineering, Pusan National University, Pusan, 609-735, Korea

Chang-Sik Ha Department of Polymer Science and Engineering, Pusan National University, Pusan, 609-735, Korea

Abstract

Polymeric light-emitting diode (PLED) using polyimide/polyimide double layer structure was prepared in this work. The polyimide was used as a matrix polymer binding a hole-transporting material (HTM) or lumophore. The HTM and lumophore are N,N-diphenyl-N,N′-di(m-tolyl)benzidine (TPD) and tris(8-hydroxyquinolinato) aluminum (Alq₃), respectively. The bright green light was observed at 16 Vdc with naked eyes, with the turn-on voltage of ca. 10 Vdc.

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Polyimide/Polyimide Double Layer Structured Light-Emitting Diodes and their Characteristics

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