8 October 2005 High-efficiency new polymer light-emitting diodes with a stabilized blue emission
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Conjugated polymers with a stabilized blue emission are of importance for the realization of full-color displays using polymer light-emitting diodes. We report a new class of blue-emitting polymers utilizing a new back-bone, poly(2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta [def] phenanthrene)) (PCPP). This material emits a stabilized, efficient blueelectroluminescence(EL) without exhibiting any peak in the long wavelength region (green region) even after prolonged annealing for 18 hours at an elevated temperature of 150°C in air. This attributes to the chemical structure of this new polymer. The backbone of PCPP intrinsically inhibits the formation of the keto-defects mainly responsible for the degradation to green color in typical poly(fluorine) type materials, thereby stabilizing the blue EL emission in the devices.
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Sung Heum Park, Sung Heum Park, Jin Young Kim, Jin Young Kim, Sun Hee Kim, Sun Hee Kim, Youngeup Jin, Youngeup Jin, Jinwoo Kim, Jinwoo Kim, Hongsuk Suh, Hongsuk Suh, Kwanghee Lee, Kwanghee Lee, } "High-efficiency new polymer light-emitting diodes with a stabilized blue emission", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593710 (8 October 2005); doi: 10.1117/12.616042; https://doi.org/10.1117/12.616042

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