TY - JOUR
T1 - Electroluminescent main-chain copolymers containing phosphorescent benzimidazole-based iridium complexes as copolymerization backbone units or dopants
AU - Huang, Wei Sheng
AU - Wu, Ying Hsien
AU - Lin, Hong-Cheu
AU - Lin, Jiann T.
PY - 2010/6/1
Y1 - 2010/6/1
N2 - A series of novel electroluminescent main-chain copolymers containing fluorene-1,4-bis(9-octyl-9H-carbarzol-3yl)-2,5-dioctyloxy-benzene (BCB) segments and phosphorescent benzimidazole-based iridium (Ir) complexes in the backbones were synthesized by Suzuki coupling reaction. The relative intensity of phosphorescence and fluorescence were affected by the energy transfer and back transfer efficiencies between the polymer backbones and the iridium units as evidenced by solid state PL and EL spectra. PLED devices with a configuration of ITO/PEDOT: PSS (70 nm)/Ir-copolymers (P3-P10) or Ir-doped copolymers (P1-P2 doped with Ir-complex 4) (60-80 nm)/TPBI (40 nm)/LiF (1 nm)/Al (120 nm) were fabricated, where electroluminescence (EL) efficiencies depended on the chemical constituents and the triplet energies of the copolymers. PLED devices based on Ir-containing copolymer P8 or copolymer P2 doped with 5 mol% Ir-complex 4 exhibited white-light emissions with EL properties of ηext,max = 0.93%, ηc,max = 1.88 cd A-1, and Lmax = 1960 cd m-2 from the former (P8), and ηext,max = 4.09%, ηc,max = 10.94 cd A-1, and Lmax = 4870 cd m-2 from the latter (P2 doped with Ir-complex 4), respectively. The CIE coordinates, color-rendering index (CRI) and correlated color temperature (CCT) of the two PLED devices were (0.33, 0.30) at 13 V, 74 and 5966 K for the former, and (0.35, 0.32) at 15 V, 82 and 6147 K for the latter, respectively.
AB - A series of novel electroluminescent main-chain copolymers containing fluorene-1,4-bis(9-octyl-9H-carbarzol-3yl)-2,5-dioctyloxy-benzene (BCB) segments and phosphorescent benzimidazole-based iridium (Ir) complexes in the backbones were synthesized by Suzuki coupling reaction. The relative intensity of phosphorescence and fluorescence were affected by the energy transfer and back transfer efficiencies between the polymer backbones and the iridium units as evidenced by solid state PL and EL spectra. PLED devices with a configuration of ITO/PEDOT: PSS (70 nm)/Ir-copolymers (P3-P10) or Ir-doped copolymers (P1-P2 doped with Ir-complex 4) (60-80 nm)/TPBI (40 nm)/LiF (1 nm)/Al (120 nm) were fabricated, where electroluminescence (EL) efficiencies depended on the chemical constituents and the triplet energies of the copolymers. PLED devices based on Ir-containing copolymer P8 or copolymer P2 doped with 5 mol% Ir-complex 4 exhibited white-light emissions with EL properties of ηext,max = 0.93%, ηc,max = 1.88 cd A-1, and Lmax = 1960 cd m-2 from the former (P8), and ηext,max = 4.09%, ηc,max = 10.94 cd A-1, and Lmax = 4870 cd m-2 from the latter (P2 doped with Ir-complex 4), respectively. The CIE coordinates, color-rendering index (CRI) and correlated color temperature (CCT) of the two PLED devices were (0.33, 0.30) at 13 V, 74 and 5966 K for the former, and (0.35, 0.32) at 15 V, 82 and 6147 K for the latter, respectively.
UR - http://www.scopus.com/inward/record.url?scp=78649698431&partnerID=8YFLogxK
U2 - 10.1039/b9py00276f
DO - 10.1039/b9py00276f
M3 - Article
AN - SCOPUS:78649698431
VL - 1
SP - 494
EP - 505
JO - Polymer Chemistry
JF - Polymer Chemistry
SN - 1759-9954
IS - 4
ER -