Organic Light Emitting Diodes and Photo Detectors Fabricated on a Polymeric Substrate for Flexible Optical Integrated De
- PDF / 212,853 Bytes
- 10 Pages / 612 x 792 pts (letter) Page_size
- 91 Downloads / 188 Views
H4.4.1
Organic Light Emitting Diodes and Photo Detectors Fabricated on a Polymeric Substrate for Flexible Optical Integrated Devices Yutaka Ohmori, Hirotake Kajii, Takayuki Taneda, Masamitsu Kaneko Osaka University, Collaborative Research Center for Advanced Science and Technology (CRCAST), 2-1 Yamada-Oka, Suita, Osaka 565-0871, JAPAN
ABSTRACT Direct fabrication of organic light emitting diodes (OLED) on a polymeric substrate, i.e., polymeric waveguide substrate to form a flexile optical integrated devices has been realized. The OELD was fabricated by organic molecular beam deposition (OMBD) technique on a polymeric substrate and a glass substrate, for comparison. The device fabricated on a polymeric substrate shows similar device characteristics to that on a glass substrate. Optical signal of faster than 100 MHz has been created by applying pulsed voltage directly to the OLED with emissive layers utilizing rubrene or porphine doped in 8-hydoxyquinolinum aluminum derivatives. Optical signal transmission with OLED fabricated on a polymeric waveguide with optical connectors has been successfully realized. Optical photo detectors (OPD) utilizing phthalocyanine derivatives with superlattice structure provide increased pulse response with input optical signals, and the OPD with 5 MHz of cut-off frequency has been realized with superlattice structure under reverse bias voltage to the OPD. INTRODUCTION Organic light emitting diodes (OLED) [1] utilizing fluorescent dye or conducting polymer have attracted great interest because they have advantages for thin film flat-panel display application. An additional advantage is that they are simple for fabrication on various kinds of substrates, including polymeric substrates. Metal phthalocyanines are well-known materials which show good stability, photo activity and with high electrical mobility. Among them, fluorinated phthalocyanine will be one of the candidate materials for electron conductive materials. Using superlattice structure, high-speed organic photo-detector (OPD) has been reported [2]. On the other hands, polymeric waveguide devices have attracted great attentions with regard to their use for optical interconnection with high-speed transmission and flexible optical integrated circuits. The combination of polymeric waveguide [3] with OLED and OPD will realize a flexible optical integrated devices [4, 5]. In this paper, we discuss the characteristics of OLEDs fabricated on polymeric substrates, i.e., polymeric waveguides. We also discuss photo-response of OPD, which consists of multilayered phthalocyanine derivatives and organic dye thin films. EXPERIMENTAL OLEDs with various emissive materials including red light, yellow light, green light and blue light emissions have been investigated. The organic layers for OLEDs and OPDs were vacuum deposited by organic molecular beam deposition (OMBD) system at a background pressure of 10-5 Pa. For substrates used for the experiments, polymeric substrates were mainly
Downloaded from https://www.cambridge.org/core. UNSW Library
Data Loading...
