Prepared of White Electroluminescent Device Using Polymer Blends

• Main Authors: Chien-Fa Lee, 李健發
• Other Authors: Su-Hua Yang
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/27352308675818255985

碩士 === 國立高雄應用科技大學 === 電子與資訊工程研究所碩士班 === 94 === The PLED manufactured single-layer by blend method can achieve white light emission through Förster energy transfer mechanism. The dopant in blend polymer emitted via energy transfer between host and guest materials is usually controlled in a very low doping level. The required emission color is easily turned by varying polymer concentrations. In this paper we used poly (9-vinylcarbazole) (PVK) as host material, by means of energy transfer the excitation energy was carried from PVK to Poly[(9,9–Dioctyl-2,7-bis(2-cyano)vinylenefluorenylene)-alt-co-(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene)](OPA3008), and to poly[2-methoxy -5-{2-etylhexyloxy}1,4-phenylenevinylene-co-(4,4’-biphenylene)] (MEH-BP-PPV), where two polymers acted as guest materials. The PVK:OPA3008:MEH-BP-PPV blend polymer exhibited a blue to red emission with wavelength from 400 to 560 nm. The white light emission for PVK blended with MEH-BP-PPV was attributed to poorly miscible or immiscible effect. The miscible behavior of blended polymer was an important factor in efficient energy transfer. In this studied, we found the white emission electroluminescence (EL) property of the binary blended polymer which was obtained when the composition weight ratio of PVK: MEH-BP-PPV was at 100 : 1. CIE coordinates of EL were x = 0.30, y = 0.25.In the meanwhile, in the ternary blend, which was obtained when the composition weight ratio of PVK: OPA3008:MEH-BP-PPV was at 100 : 0.5 : 2. CIE coordinates of EL were x = 0.352, y = 0.347.