Flexible top-emitting electroluminescent devices on polyethylene terephthalate substrates

Yanqing Li; Li-Wei Tan; Xiao-Tao Hao; Kian Soo Ong; Furong Zhu; Liang-Sun Hung
April 2005
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p153508
Academic Journal
An aluminum-laminated polyethylene terephthalate (Al-PET) is used as the substrate for flexible organic light-emitting devices (OLEDs). The efficient flexible electroluminescent devices have a top-emitting OLED architecture. An acrylic layer is formed on the Al-PET surface to improve the surface morphology and also the adhesion between the substrate and the anode. Poly(styrene sulfonate)-doped poly(3,4-ethylene dioxythiophene) was used as hole transporting layer. The light-emitting polymer used is a phenyl-substituted poly(p-phenylenevinylene). Bilayer anodes of Ag/CFX and Ag/indium-tin oxide and a semitransparent top cathode were used for the flexible polymer OLEDs. For a flexible polymer OLED with a 110-nm-thick light-emitting polymer, it exhibited superior electrical and optical characteristics with a luminous efficiency of 4.56 cd/A at an operating voltage of 7.5 V.


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