(A) Polyfluorene Containing Bipolar Pendent Groups and it’s Application in Electroluminescent Devices (B) Highly Efficient Single-Component Polymeric White-Light-Emitting Diodes Based on Polyfluorene with Benzoselenadizole Moieties

• Main Author: 簡辰翰
• Other Authors: Ching-Fong Shu
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/21125730606213382603

碩士 === 國立交通大學 === 應用化學系所 === 94 === (A)Polyfluorene Containing Bipolar Pendent Groups and it’s Application in Electroluminescent Devices Blue-light-emitting polyfluorene derivatives (PF-TPAOXD) with bulky bipolar pendent groups at C-9 position has been synthesized. The combination of electron-deficient oxadiazole and electron-rich triphenylamine affords a highly efficient light-emitting material by improving charge injection and transport in electroluminescent device. In addition, this polymer possesses thermally stable characteristics (Tg: 186 oC); no aggregates and excimers were observed even after being annealed at 150 oC under nitrogen for 20 h. The maximum external quantum efficiency of electroluminescent device using this polymer as the emitting layer is 1.43 % (at a brightness of 137 cd/m2 with driving voltage of 6.5 V). Furthermore, red-emitting device using PF-TPAOXD as the host matrix and red electrophosphorescent material Os(fppz) at the dopant device reached a maximum external quantum efficiency of 7.33 % (at a brightness of 1747 cd/m2 with driving voltage of 12.5 V). (B)Highly Efficient Single-Component Polymeric White-Light-Emitting Diodes Based on Polyfluorene with Benzoselenadizole Moieties A highly efficient single-component white-light-emitting fluorene based copolymer (TOF-BSeD0.70) has been synthesized by chemically doped small amount of orange chromaphor benzoselenadizole (BSeD) onto PF-TPA-OXD backbones. The appropriate unit ratio was found with 0.7 mol % BSeD in resulting polymer to achieve white-lighting-emission consisting of both blue-emitting and orange-emitting moieties. Thermal behavior of these polymers are relatively stable as PF-TPA-OXD. A light-emitting device based on this exhibits a voltage-independent and stable white-light emission (0.30, 0.36). The maximum external quantum efficiency of a single layer device using this copolymer as the emitting layer is 1.54 % (at a brightness of 394 cd/m2 with driving voltage of 10 V).