Yu, JW Kim, JK Hong, JM Kim, YC Cho, HN Kim, DY Kim, CY 2024-01-21T14:07:55Z 2024-01-21T14:07:55Z 2021-09-05 2000-05 0256-7679 https://pubs.kist.re.kr/handle/201004/141434 Fluorene-based alternating and statistical copolymers were synthesized by employing reaction methods of Wittig, Heck; and Suzuki. The copolymers were classified into three groups with the photoluminescence (PL) emission maxima at 420, 475 and 500 nm, respectively. Statistical copolymers with two chromophores having PL emission maxima at 420 and 475 nm Emitted Light with the emission maximum at 475 nm on photoexcitation at 365 nm and improved the quantum efficiency by the energy transfer. However, the intramolecular energy transfer was inefficient compared to the intermolecular energy transfer when the two chromophores were apart from each other in the range of the Forster critical distance. Fluorene-pyridinedivinylene alternating copolymer was synthesized by the Wittig reaction and found to have physical, electronic and electrochemical properties of the individual units intact. The double-layered light emitting diode (LED) with the statistical copolymer as an emitting layer and the pyridine-containing copolymer as an electron transporting-hole blocking layer, which were sandwiched between ITO and Al, displayed a quantum efficiency of 0.1%. English SPRINGER-VERLAG BERLIN Molecular design of light emitting polymers Article 1 CHINESE JOURNAL OF POLYMER SCIENCE, v.18, no.3, pp.227 - 237 CHINESE JOURNAL OF POLYMER SCIENCE 18 3 227 237 N scie scopus 000086762200006 2-s2.0-0034391272 Polymer Science Polymer Science Article ELECTROLUMINESCENT DEVICES STATISTICAL COPOLYMERS CONJUGATED POLYMERS DIODES EMISSION BLUE DERIVATIVES light emitting polymers