Park, JH Lee, KJ Park, OO Yu, JW Kim, YC Kim, JK 2024-01-21T07:30:59Z 2024-01-21T07:30:59Z 2021-09-02 2004-03-01 0009-2614 https://pubs.kist.re.kr/handle/201004/137771 Electroluminescence (EL) and the dynamics of charge carrier recombination in the PVK/poly(9,9'-dihexylfluorene-2,7-divinylene-m-phenylenevinylene-stat-p-phenylenevinylene)(PDHFPPV) bilayer EL devices, which have various film thickness ratios, were studied. The indium-tinoxide (ITO)/(PVK/PDHFPPV bilayer)/Li:Al devices showed more enhanced color quality compared with those of single and blended devices. The current-voltage-luminescence characteristics of the devices, which have a different PVK/PDHFPPV thickness ratio, are systematically studied and compared with a best PVK:PDHFPPV blended device. The EL light output of bilayer devices can be improved remarkably by controlling PVK and PDHFPPV polymer thickness. The ITO/(PVK (60 nm)/PDHFPPV (50 nm) bilayer)/Li:Al device showed similar to50 times improved light output compared with that of best blended device. (C) 2003 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV BLUE ELECTROLUMINESCENCE EXCIPLEX EMISSION POLYMERS DEVICES Enhanced light output in bilayer light-emitting diodes with film thickness variations Article 10.1016/j.cplett.2004.01.039 1 CHEMICAL PHYSICS LETTERS, v.386, no.1-3, pp.101 - 104 CHEMICAL PHYSICS LETTERS 386 1-3 101 104 scie scopus 000189244300017 2-s2.0-1242271255 Chemistry, Physical Physics, Atomic, Molecular & Chemical Chemistry Physics Article BLUE ELECTROLUMINESCENCE EXCIPLEX EMISSION POLYMERS DEVICES Light Emitting Diodes Bilayer