TITLE

Efficient single-layer “twistacene”-doped polymer white light-emitting diodes

AUTHOR(S)
Qianfei Xu; Duong, Hieu M.; Wudl, Fred; Yang Yang
PUB. DATE
October 2004
SOURCE
Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3357
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Bright, efficient, and stable white polymer light-emitting diodes based on blue polyfluorene doped by a “twistacene,” 6, 8, 15, 17-tetraphenyl-1.18, 4.5, 9.10, 13.14-tetrabenzoheptacene (3) (TBH), are demonstrated. In “twistacene” the terminal pyrene moieties serve two functions: (i) to stabilize the inherently unstable heptacene and (ii) to enable the oligoacene to be a strongly fluorescent molecule. As a result, efficient and very bright white polymer light-emitting diodes are obtained. The maximum luminance of the devices exceeds 20 000 cd/m2. The maximum luminous efficiency is 3.55 cd/A at 4228 cd/m2 while the maximum power efficiency is 1.6 lm/W at 310 cd/m2. The device obtains a stable white balance by a combination of energy transfer from the blue polyfluorene to TBH by 1% TBH doping plus the host emission. The device emission color is not a function of bias current, which is ideal for various applications, from lighting to the backlight for liquid crystal displays.
ACCESSION #
14803361

 

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