Share Email Print
cover

Proceedings Paper

Blue emitting OLED with star-shaped multifunctional oligomer
Author(s): Meng Lian Gong; Neng Jun Xiang; K. L. Tong; Tik Ho Lee; Shu Kong So; Louis M. Leung
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

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, 1H-NMR and mass spectroscopy. Thermogravimetric (TG) and differential scanning calorimetry (DSC) analysis show that TPOPA exhibits high thermal stability (Td, 373°C) and high glass-transition temperature (Tg, 116 °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 hole-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 nm) (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 nm with a maximum luminance of 650 cd/m2 and 512 cd/m2 under an operating voltage of 12 V, respectively.

Paper Details

Date Published: 5 December 2006
PDF: 9 pages
Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 63331H (5 December 2006); doi: 10.1117/12.679990
Show Author Affiliations
Meng Lian Gong, Sun Yat-sen Univ. (China)
Neng Jun Xiang, Sun Yat-sen Univ. (China)
Hong Kong Baptist Univ. (Hong Kong China)
K. L. Tong, Hong Kong Baptist Univ. (Hong Kong China)
Tik Ho Lee, Hong Kong Baptist Univ. (Hong Kong China)
Shu Kong So, Hong Kong Baptist Univ. (Hong Kong China)
Louis M. Leung, Hong Kong Baptist Univ. (Hong Kong China)


Published in SPIE Proceedings Vol. 6333:
Organic Light Emitting Materials and Devices X
Zakya H. Kafafi; Franky So, Editor(s)

© SPIE. Terms of Use
Back to Top