Lee, Hang Ken Kim, Tae-Ho Park, Jong Hyeok Kim, Jai-Kyeong Park, O. Ok 2024-01-20T17:01:13Z 2024-01-20T17:01:13Z 2021-09-05 2011-06 1566-1199 https://pubs.kist.re.kr/handle/201004/130283 We demonstrate that voltage-independent and highly efficient white light-emitting diodes (WLED) can be obtained based on phosphorescent dye-doped conjugated polymer blend films. Conjugated polymers are used as the blue and green emitters, as well as the energy host, and a phosphorescent dye is used as the red emitter and guest material. The phase-separation between the conjugated polymers is suppressed by blending miscible polymer and copolymer having the same moiety. Therefore, we expect that efficient Forster-type energy transfer occurs through this homogeneous morphology. By introducing the copolymer into the emissive layer to enhance its miscibility, we obtained a voltage-invariant white emission from the polymeric LEDs. The luminous efficiency of the WLED with the single active layer is increased dramatically by introducing the phosphorescent dopant as a red emitter. (C) 2011 Elsevier B.V. All rights reserved. English ELSEVIER ENERGY-TRANSFER DEVICES ELECTROPHOSPHORESCENCE White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye Article 10.1016/j.orgel.2011.03.001 1 ORGANIC ELECTRONICS, v.12, no.6, pp.891 - 896 ORGANIC ELECTRONICS 12 6 891 896 scie scopus 000290024900004 2-s2.0-79953260322 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article ENERGY-TRANSFER DEVICES ELECTROPHOSPHORESCENCE White-light-emitting diodes Miscibility Voltage-stable Phosphorescent dopant