It has been challenging to develop deep blue organic molecular fluorescent emitters with CIE y(y≤0.08)based on triplet-triplet annihilation(TTA). Here, we report facilely available dianthracenylphenylenebased emitter...It has been challenging to develop deep blue organic molecular fluorescent emitters with CIE y(y≤0.08)based on triplet-triplet annihilation(TTA). Here, we report facilely available dianthracenylphenylenebased emitters, which have a 3,5-di(4-t-butylphenyl)phenyl moiety at the one end and 4-cyanophenyl or 3-pyridyl at the other end, respectively. Both fluorophores show a high glass transition temperature of over 220℃ with a thermal decomposition temperature of over 430℃ at an initial weight loss of1%. The preliminary characterizations of the organic light-emitting diodes(OLEDs) that utilized these nondoped emitters provided high EQEs of 4.6%à5.9% with CIE coordinates(0.15, 0.07–0.08). The analysis of the EL transient decay revealed that TTA contributed to the observed performance. The results show that the new emitters are attractive as a potential TTA-based host to afford stable deep blue fluorescent OLEDs.展开更多
In this paper,two AIE-active luminogens(Oxa-pTPE and Oxa-mTPE)constructed from tetraphenylethene and oxadiazole units were successfully synthesized and their thermal,optical and electronic properties were investigated...In this paper,two AIE-active luminogens(Oxa-pTPE and Oxa-mTPE)constructed from tetraphenylethene and oxadiazole units were successfully synthesized and their thermal,optical and electronic properties were investigated.By linking TPE to the oxadiazole core through meta-or para-position,the intramolecular conjugation is effectively controlled.Thanks to the intelligent molecular design and specific AIE feature,when fabricated as emissive layers in non-doped OLEDs,they exhibit blue or deep-blue emission with CIE coordinates of(0.17,0.23)and(0.15,0.12),and good efficiencies with ηC,max and ηP,max up to 1.52 cd A-1and 0.84 ImW -1,shedding some light on the construction of deep-blue AIE fluorophores.展开更多
目前,商用的深蓝有机发光二极管(OLED)使用的三重态-三重态融合(TTF)型发光材料只能捕获50%的三重态(T_(1))激子,导致其器件效率较低.基于窄带蓝色发射体的热激活延迟荧光(TADF)和超荧光策略可以实现接近100%的激子利用率,然而,在发射层...目前,商用的深蓝有机发光二极管(OLED)使用的三重态-三重态融合(TTF)型发光材料只能捕获50%的三重态(T_(1))激子,导致其器件效率较低.基于窄带蓝色发射体的热激活延迟荧光(TADF)和超荧光策略可以实现接近100%的激子利用率,然而,在发射层(EML)中停留的高能量T_(1)激子通常会导致不可避免的分子降解,从而限制了器件的使用寿命.为了解决这一问题,本文研究了一种TTF-杂化局域-电荷转移态(HLCT)一体化分子,旨在通过多个激子回收通道降低EML内T_(1)激子的密度,从而提高高效深蓝OLED的稳定性.通过TTF过程回收T_(1)激子,通过HLCT过程利用高能三重态(Tn)激子,可以提高EML中三重态激子的利用率.此外,低浓度掺杂的TTF-HLCT分子在TADF体系中可以减轻T_(1)激子猝灭造成的效率损失.最后,实现了外量子效率(EQE)为25.9%、CIE为(0.131,0.050)、蓝光指数(CE由CIEy校准)为312 cd A^(−1) CIE_(y)^(−1)的顶发射OLED,并且其寿命T90@1000 cd m^(−2)从0.5小时延长到6.1小时.本工作揭示了低浓度TTF-HLCT分子掺杂的潜力,作为一种可行的解决方案,可以最大限度地减少效率猝灭,并解决蓝光OLED的稳定性问题.展开更多
采用Suzuki聚合方法合成了以菲并咪唑为侧链的4种含硅宽禁带发光聚合物,并研究了这4种聚合物的光物理、电化学性质与电致发光性能.结果表明四苯基硅基团的引入能够得到宽的带隙,侧基上菲并咪唑的引入可以实现深蓝光发射.其中,基于聚合...采用Suzuki聚合方法合成了以菲并咪唑为侧链的4种含硅宽禁带发光聚合物,并研究了这4种聚合物的光物理、电化学性质与电致发光性能.结果表明四苯基硅基团的引入能够得到宽的带隙,侧基上菲并咪唑的引入可以实现深蓝光发射.其中,基于聚合物P1的电致发光器件最大外量子效率为0.65%,最大发光效率为0.33 cd A^(-1),色坐标为(0.163,0.099).展开更多
基金supported by the National Key R&D Program of China(2016YFB0400701)NSFC-Guangdong Joint Program(U1801258 and U1301243)+2 种基金Department of Science and Technology of Guangdong Province(2017A050503002)Foundation of Guangzhou Science and Technology Project(201504010012)the support of Dongguan Major Special Project(2017215117010)
文摘It has been challenging to develop deep blue organic molecular fluorescent emitters with CIE y(y≤0.08)based on triplet-triplet annihilation(TTA). Here, we report facilely available dianthracenylphenylenebased emitters, which have a 3,5-di(4-t-butylphenyl)phenyl moiety at the one end and 4-cyanophenyl or 3-pyridyl at the other end, respectively. Both fluorophores show a high glass transition temperature of over 220℃ with a thermal decomposition temperature of over 430℃ at an initial weight loss of1%. The preliminary characterizations of the organic light-emitting diodes(OLEDs) that utilized these nondoped emitters provided high EQEs of 4.6%à5.9% with CIE coordinates(0.15, 0.07–0.08). The analysis of the EL transient decay revealed that TTA contributed to the observed performance. The results show that the new emitters are attractive as a potential TTA-based host to afford stable deep blue fluorescent OLEDs.
文摘In this paper,two AIE-active luminogens(Oxa-pTPE and Oxa-mTPE)constructed from tetraphenylethene and oxadiazole units were successfully synthesized and their thermal,optical and electronic properties were investigated.By linking TPE to the oxadiazole core through meta-or para-position,the intramolecular conjugation is effectively controlled.Thanks to the intelligent molecular design and specific AIE feature,when fabricated as emissive layers in non-doped OLEDs,they exhibit blue or deep-blue emission with CIE coordinates of(0.17,0.23)and(0.15,0.12),and good efficiencies with ηC,max and ηP,max up to 1.52 cd A-1and 0.84 ImW -1,shedding some light on the construction of deep-blue AIE fluorophores.
基金supported by the National Key Research and Development Program of China(2022YFE0109000)the National Natural Science Foundation of China(62374112)the Natural Science Foundation of Shandong Province(ZR2002MF271).
文摘目前,商用的深蓝有机发光二极管(OLED)使用的三重态-三重态融合(TTF)型发光材料只能捕获50%的三重态(T_(1))激子,导致其器件效率较低.基于窄带蓝色发射体的热激活延迟荧光(TADF)和超荧光策略可以实现接近100%的激子利用率,然而,在发射层(EML)中停留的高能量T_(1)激子通常会导致不可避免的分子降解,从而限制了器件的使用寿命.为了解决这一问题,本文研究了一种TTF-杂化局域-电荷转移态(HLCT)一体化分子,旨在通过多个激子回收通道降低EML内T_(1)激子的密度,从而提高高效深蓝OLED的稳定性.通过TTF过程回收T_(1)激子,通过HLCT过程利用高能三重态(Tn)激子,可以提高EML中三重态激子的利用率.此外,低浓度掺杂的TTF-HLCT分子在TADF体系中可以减轻T_(1)激子猝灭造成的效率损失.最后,实现了外量子效率(EQE)为25.9%、CIE为(0.131,0.050)、蓝光指数(CE由CIEy校准)为312 cd A^(−1) CIE_(y)^(−1)的顶发射OLED,并且其寿命T90@1000 cd m^(−2)从0.5小时延长到6.1小时.本工作揭示了低浓度TTF-HLCT分子掺杂的潜力,作为一种可行的解决方案,可以最大限度地减少效率猝灭,并解决蓝光OLED的稳定性问题.
文摘采用Suzuki聚合方法合成了以菲并咪唑为侧链的4种含硅宽禁带发光聚合物,并研究了这4种聚合物的光物理、电化学性质与电致发光性能.结果表明四苯基硅基团的引入能够得到宽的带隙,侧基上菲并咪唑的引入可以实现深蓝光发射.其中,基于聚合物P1的电致发光器件最大外量子效率为0.65%,最大发光效率为0.33 cd A^(-1),色坐标为(0.163,0.099).
