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Efficient deep blue fluorescent polymer light-emitting diodes (PLEDs).

机译:高效的深蓝色荧光聚合物发光二极管(PLED)。

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摘要

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).
机译:据报道,一系列新的深蓝色/蓝色发光共聚物。已经有不同组成的聚(9,9-二己基芴-3,6-二基和2,7-二基-co-2,8-二己基二苯并噻吩-S,S-二氧化物-3,7-二基)衍生物p(FS)综合的。两种不同的具有二烷氧基侧链的S衍生物,F:S单体进料比以及相对于F单元的间共轭对位共轭效应均已在光物理和聚合物发光二极管(PLED)器件性能方面进行了研究。架构ITO / PEDOT:PSS /聚合物/ TPBi / LiF / Al。聚(9,9-二己基芴-3,6-二基-co-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)三种不同的共聚单体比率P1-3,在415 nm处产生深蓝色电致发光峰,比率70:30 p(Fm:SOCy)产生最大的外部量子效率(EQE)ηext,最大2.7%,而比例为85:15时,最大亮度Lmax最高,为81 cd m-2,CIE坐标为(0.17,0.12)。类似的对位聚(9,9-二己基芴-2,7-二基-co-2,8-二(O-亚甲基环己基)二苯并噻吩-S,S-dioxide-3,7-二基)p(Fp-SOCy)和聚(9,9-二己基芴-2,7-二基-co-2,8-二己基氧基二苯并噻吩-S ,S-dioxide-3,7-diyl)p(Fp-SO6)以两种不同的比率P4-7产生蓝色发射峰,约为。 450 nm。 70:30 F:S单元的比例始终比相应的50:50共聚物提供更好的设备。还观察到,掺入较大的SOCy衍生物的共聚物可提供更高效,更明亮的设备,聚合物P5的ηext,最大值3.2%,4.4 cd A-1、3.4 lm W-1和最大亮度2500 cd m- 2,带有CIE(0.16,0.18)。

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