TY - JOUR
T1 - Synthesis, photophysics, and electroluminescent performance of stable blue-light-emitting copoly(9,9-diarylfluorene)s
AU - Chen, Ruei Tang
AU - Chen, Shinn Horng
AU - Hsieh, Bar Yuan
AU - Chen, Yun
PY - 2009/6/1
Y1 - 2009/6/1
N2 - A series of fluorene derivatives containing nonsymmetric and bulky aromatic groups at C-9 position were synthesized and used for the preparation of blue- light-emitting copolyfluorenes (P1-P4) by the Suzuki coupling polycondensation. The copolymers were characterized by molecular weight determination, elemental analysis, differential scanning calorimeter, thermogravimetric analysis, absorption and emission spectroscopy, cyclic voltammetry, and differential pulse voltammetry. Their decomposition temperatures and glass transition temperatures are 423-441 ̈C and >120 ̈C, respectively. In film state, the copolyfluorenes exhibit blue photolumines- cence at 425-450 nm, which remains almost unchanged after annealing at 200 ̈Cin air for 60 min. Polymer light-emitting diodes [ITO/PEDOT:PSS/P1-P4/Ca(50 nm)/ Al(100 nm)] show stable blue-light emission under device operation with the CIE coordinates being between (0.16, 0.07) and (0.17, 0.09). The light-emitting diodes devices from P1 and P3 containing electron-deficient oxadiazole units display enhanced performance, with the maximum brightness and maximum current efficiency being (4510 cd/m2 and 2.40 cd/A) and (2930 cd/m2, 1.19 cd/A), respectively.
AB - A series of fluorene derivatives containing nonsymmetric and bulky aromatic groups at C-9 position were synthesized and used for the preparation of blue- light-emitting copolyfluorenes (P1-P4) by the Suzuki coupling polycondensation. The copolymers were characterized by molecular weight determination, elemental analysis, differential scanning calorimeter, thermogravimetric analysis, absorption and emission spectroscopy, cyclic voltammetry, and differential pulse voltammetry. Their decomposition temperatures and glass transition temperatures are 423-441 ̈C and >120 ̈C, respectively. In film state, the copolyfluorenes exhibit blue photolumines- cence at 425-450 nm, which remains almost unchanged after annealing at 200 ̈Cin air for 60 min. Polymer light-emitting diodes [ITO/PEDOT:PSS/P1-P4/Ca(50 nm)/ Al(100 nm)] show stable blue-light emission under device operation with the CIE coordinates being between (0.16, 0.07) and (0.17, 0.09). The light-emitting diodes devices from P1 and P3 containing electron-deficient oxadiazole units display enhanced performance, with the maximum brightness and maximum current efficiency being (4510 cd/m2 and 2.40 cd/A) and (2930 cd/m2, 1.19 cd/A), respectively.
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U2 - 10.1002/pola.23373
DO - 10.1002/pola.23373
M3 - Article
AN - SCOPUS:66449107153
SN - 0887-624X
VL - 47
SP - 2821
EP - 2834
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
IS - 11
ER -