Blue emitting OLED with star-shaped multi-functional oligomer

被引：0

作者：

Gong, Meng Lian ^{[1
]}

Xiang, Neng Jun ^{[1
,2
]}

Tong, K. L. ^{[2
]}

Lee, Tik Ho ^{[2
]}

So, Shu Kong ^{[2
]}

Leung, Louis M. ^{[2
]}

机构：

[1] Sun Yat Sen Univ, Sch Chem & Chem Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China

[2] Hong Kong Bapist Univ, Ctr Adv Luminescence Mat, Kowloon, Hong Kong, Peoples R China

来源：

ORGANIC LIGHT EMITTING MATERIALS AND DEVICES X | 2006年 / 6333卷

关键词：

ambipolar oliogomer; oxadiazole; arylamine; OLED;

D O I：

10.1117/12.679990

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A fluorescent star-shaped oligomer with a nitrogen atom as a core and both a hole transporting arylamine and an electron transporting 1,3,4-oxadiazole moiety, tri(4-(5-phenyl-1, 3, 4-oxadiazol-2-yl)phenyl)amine (TPOPA), has been designed and synthesized using a 5-step reaction procedure. The synthesized compound was characterized by elemental analysis, H-1-NMR and mass spectroscopy. Thermogravimetnic (TG) and differential scanning calorimetry (DSC) analysis show that TPOPA exhibits high thermal stability (T-d, 373 degrees C) and high glass-transition temperature (T-g, 116 degrees C). Photoluminescence measurements indicate that the star-shaped oligomer shows intense blue emission peaked at 445 nm with a high quantum yield of 0.68 under near UV light excitation. The HOMO value of TPOPA is -5.64 eV and the LUMO is -2.58 eV based on the electro-chemical determinations. Reversible anodic oxidation results suggest that the electron-transporting is predominant for TPOPA. Two single layered devices were fabricated by vacuum evaporation with configurations of ITO / CuPC (15 nm) TPOPA (95 nm) / Ca(30 nm) / Al(100 nm) (device 1) and ITO / CuPC (15 nm) TPOPA (175 nm) / Ca(30 nm) / Al(100 nin) (device 2), where TPOPA was used both as emitter and carrier - transporting material, CuPC as a hole-injection and electron block material. The devices show blue wide-band emission peaked at 438 rim with a maximum luminance of 650 cd/m(2) and 512 cd/m(2) under an operating voltage of 12 V, respectively.

引用

页数：9