Direct identification of interfacial degradation in blue OLEDs using nanoscale chemical depth profiling by Gustavo F. Trindade, Soohwan Sul, Joonghyuk Kim, Rasmus Havelund, Anya Eyres, Sungjun Park, Youngsik Shin, Hye Jin Bae, Young Mo Sung, Lidija Matjacic, Yongsik Jung, Jungyeon Won, Woo Sung Jeon, Hyeonho Choi, Hyo Sug Lee, Jae-Cheol Lee, Jung-Hwa Kim, Ian S. Gilmore

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