Pengembangan devais elektroluminesensi berbasis bahan optik nonlinear poly (p-phenylene vinylene)

Abstract

An electroluminescent device comprises a semiconductor layer in the form of thin dense polymer film comprising at least one conjugated polymer, a first contact layer in contact with a first surface of the semiconductor and a second contact layer in contact with a second surface of the semiconductor layer. The polymer film of the semiconductor layer has a sufficiently low concentration of extrinsic charge carrier that on applying an electric field between the first and second contact layers across the semiconductors layer so as to render the second contact layer positive realtive to the first contact layer charge carrier are injected into semiconductor layer and radiation is emitted from the semiconductor layer. The polymer film that chosen is Poly (P-Phenylene Vinylene) (PPV) film. This PPV film is inserted between ITO and aluminium as electrodes. We have done some experiments to improve the characteristic of ITO/PPV/Al electroluminescent device. Synthesis experiment of monomer p-Xylylene-bis tetrahidrothiopheniumchloride was done to improve the material quality. The PPV film quality was improved by polymer concentratation variation experiment to get the homogenous thin film. To increase the emission intensity of device, we inserted PBD film as electron transporter layer between PPV layer and Al electrode. And we tried to form the device pattern by chemically ITO etched. The pattern is important to form the passive matrix device. Experiment of PPV film fabrication shows that concentration 10 % give relatively homogenous PPV film. Thin film of Poly (P-Phenylene Vinylene) (PPV) has been obtained by means of a spin-coating method with spinning speed of 750 rpm at room temperature for 30 second from a solution of polymer precursor ( sulphonium polyelectrolyte precursor).Followed by a thermal conversion process at 160°C in Ultra High Purity N2 enviromnent for 2 hours. Ultraviolet data show that increasing the thermal elimination temperature will shift the absorbance peak to longer wavelengths. The film was employed as active medium in an organic electroluminescent device with ITO/PPV/Al structure, The I-V curves measured show that the characteristic behavior for the operation is threshold voltage 3 V at current 11 mA. PBD layer that fabricated is not homogenous. We must do extended experiment to improve its quality. The pattern that formed by etched experiment is not homogenous, so the device can not emit light