Application of Copolymers Containing Carbazole, Oxadiazole, Triarylamine Derivatives in PLED devicces as Hole-Transporting Layer

• Main Authors: Chih-Yu Chen, 陳致豫
• Other Authors: Kuo-Huang Hsieh
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/43975816135358605929

碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 95 === In this thesis, two series of hole-injecting and hole-transporting materials are synthesized and characterized. These two series are (1) TRI-IPDI-Cz series, triarylamine derivatives (denoted as TRI) and Carbazole derivatives (denoted as Cz) linked by isophorone diisocyanate with different ratios to form a series of polyurehtanes (PU) and (2) Cz-IPDI-OXD series, were synthesized in a similar fashion as (1) only with different monomers, oxadiazole derivatives, denoted as OXD. These materials are applied in electroluminescent device as hole-injecting and hole-transporting layer to improve the performance. The devices are separated into two systems: a. ITO/PU/Ir(ppy)3+t-PBD+PVK/Mg/Ag : PUs were applied in the devices and the devices were compared with the standard device S1:ITO/Ir(ppy)3+t-PBD+PVK/Mg/Ag. The brightness was increased to 14000 cd/m2, the current efficiency rose to 13.4 cd/A and turn-on voltage was reduced to 21V (at 100 cd/m2), compared to 296 cd/m2, 1.02 cd/A and 37 V in S1; and b. ITO/PEDOT:PSS/PU /Ir(ppy)3+t-PBD+PVK/Mg/Ag, compared to standard device S2: ITO/PEDOT:PSS/ Ir(ppy)3+t-PBD+PVK/Mg/Ag. The brightness was increased to 12500 cd/m2, the current efficiency was up to 34.7cd/A, compared to 6250 cd/m2 and 21.8 cd/A in S2.