Park, JH Lim, YT Park, OO Kim, JK Yu, JW Kim, YC 2024-01-21T07:13:53Z 2024-01-21T07:13:53Z 2021-09-02 2004-04 1616-301X https://pubs.kist.re.kr/handle/201004/137734 Blue-light-emitting polymer (polyfluorene)/dielectric nanolayer nanocomposites were prepared by the solution intercalation method and employed in an electroluminescent (EL) device. Their photoluminescence (PL) and electroluminescence characteristics demonstrates that the interruption of interchain interaction in intercalated organic/inorganic hybrid systems reduces the low-energy emission that results from keto-defects. By reducing the probability that the excitons initially generated on the polyfluorenes will find keto-detects, both the color purity and the luminescence stability were improved. Furthermore, the dielectric nanolayers have an aspect ratio of about five hundred, and therefore act as efficient exciton blocking layers and barriers to oxygen diffusion, producing a dramatic increase in. the device stability. A nanocomposite device with a Li:Al alloy cathode gave a quantum efficiency of 1.0 %(ph/el), which corresponds to an approximate five times enhancement compared to the neat polymer device. The nanocomposite emitting layer is considered to have a pseudo-multiple quantum well structure. English WILEY-V C H VERLAG GMBH LIGHT-EMITTING-DIODES GREEN EMISSION PHOTOLUMINESCENCE ELECTROLUMINESCENCE POLARIZATION COPOLYMERS Stabilized blue emission from polymer-dielectric nanolayer nanocomposites Article 10.1002/adfm.200305045 1 ADVANCED FUNCTIONAL MATERIALS, v.14, no.4, pp.377 - 382 ADVANCED FUNCTIONAL MATERIALS 14 4 377 382 scie scopus 000221209400010 2-s2.0-2342614826 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article LIGHT-EMITTING-DIODES GREEN EMISSION PHOTOLUMINESCENCE ELECTROLUMINESCENCE POLARIZATION COPOLYMERS Light Emitting Diodes Blue Emission Nanocomposites Dielectric Nanolayer