| 초록 |
The effect of buffer layers on the organic light emitting diode (OLED) was studied. The α-septithiophene(α-7T), copperphthalocyanine(CuPc) and PEDOT were used for a buffer layer in OLED. Hole injection was investigated and improved emission efficiency. The OLEDs structure can be described as indium tin oxide(ITO)/ buffer layer / hole transporting layer / emitting layer / electron transporting layer / LiF / Al. The hole transporting layer was composed of N,N’-di(naphthalene-1-ly)-N,N’-diphenyl-benzidine(α-NPD). The emitting layer, and electron transporting layer consist of tris(8-hydroxyquinolinato) aluminum(Alq3). All organic layers were deposited at a background pressure of less than 10-6 torr using ultra high vacuum (UHV) system. The α-7T layer can substitute the hole- blocking layer, and improve hole injection properties. |
