TY - JOUR
T1 - Enhanced efficiency of polyfluorene derivatives
T2 - Organic-inorganic hybrid polymer light-emitting diodes
AU - Lee, Jonghee
AU - Cho, Hoon Je
AU - Cho, Nam Sung
AU - Hwang, Do Hoon
AU - Kang, Jong Min
AU - Lim, Eunhee
AU - Lee, Jeong Ik
AU - Shim, Hong Ku
PY - 2006/5/1
Y1 - 2006/5/1
N2 - Two novel organic-inorganic hybrid polyfluorene derivatives, poly{(9,9′-dioctyl-2,7-fluorene)-co-(9,9′-di-POSS-2,7-fluorene) -co-[2,5-bis(octyloxy)-1,4-phenylene]} (PFDOPPOSS) and poly{(9,9′-dioctyl- 2,7-fluorene)-co-(9,9′-di-POSS-2,7-fluorene)-co-bithiophenel (PFT2POSS), were synthesized by the Pd-catalyzed Suzuki reaction of polyhedral oligomeric silsesquioxane (POSS) appended fluorene, dioctyl phenylene, and bithiophene moieties. The synthesized polymers were characterized with 1H NMR spectroscopy and elemental analysis. Photoluminescence (PL) studies showed that the incorporation of the POSS pendant into the polyfluorene derivatives significantly enhanced the fluorescence quantum yields of the polymer films, likely via a reduction in the degree of interchain interaction as well as keto formation. Additionally, the blue-light-emitting polyfluorene derivative PFDOPPOSS showed high thermal color stability in PL. Moreover, single-layer light-emitting diode devices of an indium tin oxide/poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)/polymer/Ca/Al configuration fabricated with PFDOPPOSS and PFT2POSS showed much improved brightness, maximum luminescence intensity, and quantum efficiency in comparison with devices fabricated with the corresponding pristine polymers PFDOP and PFT2. In particular, the maximum external quantum efficiency of PFT2POSS was 0.13%, which was twice that of PFT2 (0.06%), and the maximum current efficiency of PFT2POSS was 0.38 cd/A, which again was twice that of PFT2 (0.19 cd/A).
AB - Two novel organic-inorganic hybrid polyfluorene derivatives, poly{(9,9′-dioctyl-2,7-fluorene)-co-(9,9′-di-POSS-2,7-fluorene) -co-[2,5-bis(octyloxy)-1,4-phenylene]} (PFDOPPOSS) and poly{(9,9′-dioctyl- 2,7-fluorene)-co-(9,9′-di-POSS-2,7-fluorene)-co-bithiophenel (PFT2POSS), were synthesized by the Pd-catalyzed Suzuki reaction of polyhedral oligomeric silsesquioxane (POSS) appended fluorene, dioctyl phenylene, and bithiophene moieties. The synthesized polymers were characterized with 1H NMR spectroscopy and elemental analysis. Photoluminescence (PL) studies showed that the incorporation of the POSS pendant into the polyfluorene derivatives significantly enhanced the fluorescence quantum yields of the polymer films, likely via a reduction in the degree of interchain interaction as well as keto formation. Additionally, the blue-light-emitting polyfluorene derivative PFDOPPOSS showed high thermal color stability in PL. Moreover, single-layer light-emitting diode devices of an indium tin oxide/poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)/polymer/Ca/Al configuration fabricated with PFDOPPOSS and PFT2POSS showed much improved brightness, maximum luminescence intensity, and quantum efficiency in comparison with devices fabricated with the corresponding pristine polymers PFDOP and PFT2. In particular, the maximum external quantum efficiency of PFT2POSS was 0.13%, which was twice that of PFT2 (0.06%), and the maximum current efficiency of PFT2POSS was 0.38 cd/A, which again was twice that of PFT2 (0.19 cd/A).
KW - Fluorescence
KW - Inorganic polymer
KW - Light emitting diodes (LED)
KW - Organic-inorganic hybrid polyfluorenes
KW - Polyhedral oligomeric silsesquioxane (POSS)
KW - Polymer light-emitting diode (PLED)
UR - http://www.scopus.com/inward/record.url?scp=33646237598&partnerID=8YFLogxK
U2 - 10.1002/pola.21413
DO - 10.1002/pola.21413
M3 - Article
AN - SCOPUS:33646237598
SN - 0887-624X
VL - 44
SP - 2943
EP - 2954
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
IS - 9
ER -