“…ITO and LiF/Al were used as the anode and cathode, respectively. Poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) has been proposed as the hole injection layer, and 4,40-(cyclohexane-1,1-dial) bis( N , N -di- p -tolylaniline) (TAPC) could be selected as a hole-transporting layer (HTL), tris(4-(9 H -carbazol-9-yl)phenyl) amine (TCTA) could be used as an electron-blocking layer (EBL), 71 and 3,3′-di(9 H -carbazol-9-yl)-1,1′-biphenyl (m-CBP) is suggested as a host in EML, 72 bis[2-(diphenylphosphine)phenyl]ether oxide (DPEPO) 73 as a hole-blocking layer (HBL) and diphenyl-bis(4-(pyridine-3-yl)phenyl)silane (DPPS) as an electron-transporting layer (ETL) 74 (see Fig. 5 ).…”