Lee, Joo-Woon Kim, Jai-Kyeong Yoon, Young-Soo 2024-01-20T20:03:29Z 2024-01-20T20:03:29Z 2021-09-02 2010-01 1001-604X https://pubs.kist.re.kr/handle/201004/131852 High efficiency organic light-emitting-devices (OLED) have been fabricated by incorporation of a polymeric layer as a controller of the Unbalanced charge. In device configuration of ITO/PEDOT:PSS/PVK/Alq(3)/LiF:Al, poly(N-vinylcarbazole) (PVK) was selected as a blocking layer (BL) because it has a hole transporting property and a higher band gap, especially a lower LUMO level than the emitting layer (Alq(3)) and a higher HOMO level than the hole injection layer (PEDOT: PSS). As a result, the optimal structure with this bl layer showed a peak efficiency of 6.89 cd/A and 2.30 lm/W compared to the device without the PVK layer of 1.08 cd/A, 0.27 lm/W. This result Shows that the PVK layer could effectively block the electrons from metal cathode and confine them in the emitting layer and accomplish the charge balance, which leads to enhanced hole-electron balance for achieving high recombination efficiency. English WILEY-V C H VERLAG GMBH ELECTROLUMINESCENT DEVICES ELECTRON INJECTION EFFICIENCY Performance Improvement of Organic Light Emitting Diodes Using Poly(N-vinylcarbazole) (PVK) as a Blocking Layer Article 10.1002/cjoc.201090025 1 CHINESE JOURNAL OF CHEMISTRY, v.28, no.1, pp.115 - 118 CHINESE JOURNAL OF CHEMISTRY 28 1 115 118 scie scopus 000274096800018 2-s2.0-77952483968 Chemistry, Multidisciplinary Chemistry Article ELECTROLUMINESCENT DEVICES ELECTRON INJECTION EFFICIENCY organic light emitting diode blocking layer charge balance poly(N-vinylcarbazole) (PVK) electron-hole balance hybrid structure