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Published in:
01-12-2008
Pure-blue tandem OLEDs based on terfluorenes compounds
Published in: Journal of Materials Science: Materials in Electronics | Issue 12/2008
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Abstract
We demonstrate a pure-blue tandem organic light-emitting devices (OLEDs) employing the blue fluorescent emitter, ter(9,9-phenylfluorene) fluoride (TPFF). The charge generation region consists of a Li-doped electron transport layer and a highly transparent WO3 thin film. Highly efficient pure-blue emission is obtained from the device. The maximum luminous efficiency of 2.08 cd/A with 1931 Commission Internationale De L’Eclairage coordinates of (0.156, 0.078) is obtained. The power efficiency of tandem device is also significantly enhanced as compared to the single-emissive unit device at high brightness. It is indicated that employing the tandem device structure is a promising route to achieving high brightness and efficient pure-blue emission.