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Thy Study of Electroluminescenct Polymers and Application in Wpled



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Thy Study of Electroluminescenct Polymers and Application in Wpled by Chiung-Feng Liao
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Polymer light-emitting diodes (PLEDs) based on fluorescent and phosphorescent electroluminescence (EL) have attracted great attention currently, and been extensively investigated. In this study, a series of copolyfluorenes (PFG1 PFG4) containing distyrylbenzene derivatives (GM) were synthesized by Suzuki coupling reaction. The electroluminescent (EL) spectra of the PFG copolymers are very different from photoluminescent (PL) spectra. The green emission (520 nm) in EL spectra are much stranger than those in PL spectra, which can be partially attributed to energy transfer from fluorene segments to GM segments. The performance of EL devices [ITO/PEDOT: PSS/polymer/Ca(50 nm)/Al(100 nm)] were improved with an increase in GM content in polymer chain. The PFG4 devices have the best performance (6794 cd/m2, 1.69 cd/A), and the PFG1 and PFG2 exhibited the similar intensity of blue and green emission. Therefore, we fabricated the WPLED by blending PFG2 with a red iridium complex. By carfully controlling the amount of the iridium complex, the WPLED device was achieved with the brightness and CIE coordinate were 4116 cd/m2 and (0.31, 0.28), respectively
Release date NZ
December 8th, 2008
Country of Publication
black & white illustrations
VDM Verlag
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