High-efficiency new polymer light-emitting diodes with a stabilized blue emission

Sung Heum Park; Jin Young Kim; Sun Hee Kim; Youngeup Jin; Jinwoo Kim; Hongsuk Suh; Kwanghee Lee

doi:10.1117/12.616042

8 October 2005 High-efficiency new polymer light-emitting diodes with a stabilized blue emission

Sung Heum Park, Jin Young Kim, Sun Hee Kim, Youngeup Jin, Jinwoo Kim, Hongsuk Suh, Kwanghee Lee

Proceedings Volume 5937, Organic Light-Emitting Materials and Devices IX; 593710 (2005) https://doi.org/10.1117/12.616042
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

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.

Citation Download Citation

Sung Heum Park, Jin Young Kim, Sun Hee Kim, Youngeup Jin, Jinwoo Kim, Hongsuk Suh, and 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); https://doi.org/10.1117/12.616042

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