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Ji Sun Park, Bo Ram Lee, Eunjae Jeong, Hyun-Jung Lee, Ju Min Lee, Ji-Seon Kim, Jin Young Kim, Han Young Woo, Sang Ouk Kim, Myoung Hoon Song. "High performance polymer light-emitting diodes with N-type metal oxide/conjugated polyelectrolyte hybrid charge transport layers." Applied Physics Letters 99.16 (2011) 163305