Details

Autor(en) / Beteiligte

• Kim, Joo Hyun
• Herguth, Petra
• Kang, Mun-Sik
• Jen, Alex K-Y.
• Tseng, Ya-Hsien
• Shu, Ching-Fong

Titel

Bright white light electroluminescent devices based on a dye-dispersed polyfluorene derivative

Ist Teil von

• Applied physics letters, 2004-08, Vol.85 (7), p.1116-1118

Erscheinungsjahr

2004

Quelle

American Institute of Physics

Beschreibungen/Notizen

• A series of efficient and bright white light-emitting diodes were fabricated using the blends of two fluorene-derived fluorescent dyes, (4,7-bis-(9,9,9′,9′-tetrahexyl-9H,9′H-[2,2′]bifluoren-7-yl)-benzo[1,2,5]thiadiazole) (FFBFF-emits green) and (4,7-bis-[5-(9,9-dihexyl-9H-fluoren-2-yl)-thiophen-2-yl]-benzo[1,2,5]thiadiazole) (FTBTF-emits red) in an efficient blue-emitting polyfluorene-derived copolymer (poly[(9,9-bis(4-di(4-n-butylphenyl)aminophenyl))]-stat-(9,9-bis(4-(5-(4-tert-butylphenyl)-2-oxadiazolyl)-phenyl))-stat-(9,9-di-n-octyl)fluorene) (PF-TPA-OXD). The resulting white light-emitting device reaches a maximum external quantum efficiency of 0.82% and a maximum brightness of 12900cd∕m2 at 12V. The Commission Internationale d’Énclairage chromaticity coordinates of the device remain very close to that of pure white emission at a relatively broad bias range from 6V(x=0.36,y=0.37)to12V(x=0.34,y=0.34).