作者:Javan H. Cook、José Santos、Haiying Li、Hameed A. Al-Attar、Martin R. Bryce、Andrew P. Monkman
DOI:10.1039/c4tc00896k
日期:——
A new series of deep blue/blue emitting co-polymers are reported. Poly(9,9-dihexylfluorene-3,6-diyl and 2,7-diyl-co-2,8-dihexyldibenzothiophene-S,S-dioxide-3,7-diyl) derivatives p(F-S) of varying composition have been synthesised. The effects of two different S derivatives with dialkoxy sidechains, the F : S monomer feed ratio, and meta versus para conjugation with respect to the F units have all been investigated in terms of photophysics and polymer light-emitting diode (PLED) device performance in the architecture ITO/PEDOT:PSS/polymer/TPBi/LiF/Al. The meta polymers poly(9,9-dihexylfluorene-3,6-diyl-co-2,8-di(O-methylenecyclohexyl)dibenzothiophene-S,S-dioxide-3,7-diyl) p(Fm-SOCy) in three different co-monomer ratios, P1–3, give deep blue electroluminescence peaking at 415 nm, with the ratio of 70 : 30 p(Fm : SOCy) producing a maximum external quantum efficiency (EQE) ηext, max 2.7%, whilst the ratio of 85 : 15 gave the highest maximum brightness Lmax of 81 cd m−2, with CIE coordinates (0.17, 0.12) The analogous para series poly(9,9-dihexylfluorene-2,7-diyl-co-2,8-di(O-methylenecyclohexyl)dibenzothiophene-S,S-dioxide-3,7-diyl) p(Fp-SOCy) and poly(9,9-dihexylfluorene-2,7-diyl-co-2,8-dihexyloxydibenzothiophene-S,S-dioxide-3,7-diyl) p(Fp-SO6) in two different ratios, P4–7, produced blue emission peaking at ca. 450 nm. The ratio of 70 : 30 F : S units consistently gave better devices than the corresponding 50 : 50 co-polymers. It was also observed that co-polymers incorporating the bulkier SOCy derivatives gave more efficient and brighter devices, with polymer P5 attaining a remarkable ηext, max 3.2%, 4.4 cd A−1, 3.4 lm W−1 and maximum brightness 2500 cd m−2 with CIE (0.16, 0.18).
报告了一系列新型深蓝/蓝色发光共聚物。我们合成了不同成分的聚(
9,9-二己基芴-3,6-二基和 2,7-二基-2,8-二己
氧基
二苯并噻吩-S,S-二
氧化物-3,7-二基)衍
生物 p(F-S)。带有二烷
氧基侧链的两种不同 S 衍
生物、F :在 ITO/P
EDOT:
PSS/polymer/TPBi/
LiF/Al 结构中,从光物理和
聚合物发光二极管 (PLED) 器件性能的角度,研究了 S 单体进料比以及 F 单元的元共轭与对位共轭的影响。三种不同共聚单体比例(P1-3)的元
聚合物聚(
9,9-二己基芴-3,6-二基-2,8-二(O-亚
甲基环己基)
二苯并噻吩-S,S-二
氧化物-3,7-二基) p(Fm-SOCy)在 415 纳米波长处发出深蓝色电致发光,其比例为 70 :30 的 p(Fm : SOCy) 产生的最大外部量子效率 (EQE) ηext 最大为 2.7%,而 85 :而 85 : 15 的比例产生的最高亮度 Lmax 为 81 cd m-2,CIE 坐标为(0.17, 0.12) 类似的对位系列聚(
9,9-二己基芴-2,7-二基-2,8-二(O-亚
甲基环己基)
二苯并噻吩-S,S-二
氧 化物-3,7-二基)p(Fp-SOCy)和聚(9、P4-7 两种不同比例的聚(9, 9-二己基
芴-2,7-二基-2,8-二己基
氧基
二苯并噻吩-S,S-二
氧 化物-3,7-二基)p(Fp-SO6)在约 450 纳米波长处产生蓝色发射峰。450 纳米。70 :30 F :S 单位的比例始终比相应的 50 :50 的共聚物相比。此外,还观察到含有体积较大的 SOCy 衍
生物的共聚物能产生更高效、更明亮的器件,其中
聚合物 P5 的ηext、最大值 3.2%、4.4 cd
A-1、3.4 lm W-1、最大亮度 2500 cd m-2(CIE 值为 0.16、0.18)都非常出色。