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| 1 | Heat revolution on photophysical properties and electroluminescent performance of Ir(ppy)_3-doped bipolar host of oxadiazole derivatives attaching with inert group of tert-butyl moiety显示文摘Two bipolar materials,2,5-bis(2-(9H-carbazole-9-yl)phenyl)-1,3,4-oxadiazole(o-CzOXD)and 2,5-bis(2-(3',6'-di-tert-butyl-9H-carbazole-9-yl)phenyl)-1,3,4-oxadiazole(tBu-o-CzOXD),were synthesized according to reported methods.In parallel study,it was demonstrated that introduction of inert tert-butyl group improved material thermal stability,even though this modification only had a slight influence to the photophysical and electrochemical properties of these materials.A comparative study focusing on effects of heat treatment was carried out on the quartz glass substrates with vacuum deposited films containing one of the bipolar host doped with 6 wt%fac-tris(2-phenylpyridinato-N,C2’)iridium(Ir(ppy)3).Results show that when the two samples were heated,the absorption,emission,and photo images of the host:dopant system changed,with the o-CzOXD suffering more severe degradation under high temperature,which is consistent with their thermal stability.In addition,it was proved that the high temperature-annealed host:dopant system can enhance the emission of the dopant.This finding was used as a guideline to improve our device performance.We fabricated two types of phosphorescent organic light-emitting devices(PhOLEDs),one was based on o-CzOXD,the other was based on tBu-o-CzOXD.They had analogous structure.We investigated the effect of heat on device performance by selectively annealing.Although these two freshly prepared devices exhibited similar performance,when annealed at 90°C for 10 min,the OLEDs based on tBu-o-CzOXD showed significant performance enhancement,which can be attributed to the observation that annealing Ir(ppy)3 doped host can change film morphology and enhance the dopant emission.The maximum efficiencies of the freshly prepared tBu-o-CzOXD device were 25.8 cd A-1,23.1lm W-1,and 9.3%;whereas those for annealed device were 47.0 cd A-1,42.2 lm W-1,and 13.4%. | WANG HongJiao LIU Chen MI BaoXiu SANG Jie LI Xin GAO ZhiQiang | 2014 | Science China Chemistry2014，57，6： | 1 |
| 2 | Pure aromatic hydrocarbons with meta-linked phenyl-core and perihedral fluorene substitutions with/without inert groups of tert-butyl: bipolar hosts for blue phosphorescence显示文摘Two pure hydrocarbon molecules of l,3,5-tris(9-phenyl-9H-fluoren-9-yl)benzene(mTPFB)and l,3,5-tris(2-tert-butyl-9-phenyl-9H-fluoren-9-yl)benzene(tBu-mTPFB)were synthesized.Due to the conjugation blocked connection mode and rigid/bulky substitutions,these two materials possess high triplet energy,enabling them as good hosts for blue phosphor in PhOLEDs.By studying their thermal,electrochemical,electronic absorption and photoluminescent properties,it was found that the influence of the inert tert-butyl group on material photoelectrical properties is negligible.For instance,mTPFB and tBu-mTPFB showed very similar absorption and emission profiles,with almost the same bandgap,triplet energy and energy levels.However,the encapsulation of tert-butyl on the 2-position of 9-phenylfluorene enhanced material thermal stability.Most importantly,carrier transport properties were improved dramatically,as proved by the mono carrier device.Blue phosphorescent OLEDs hosted by tBu-mTPFB showed external quantum efficiency of 15.2%and current efficiency of 23.0 cd/A,which were much higher than that of the OLEDs based on mTPFB with the analogous structure. | Gaowen Liu Chuanjun Wang Baoxiu Mi Minjie Zhuo Changjin Ou Jie Wang Shuchao Zheng Juan Song Zhiqiang Gao Dapeng Cao | 2017 | Science China Chemistry2017，60，2： | 0 |
| 3 | 基于磷光材料的低给体比例有机太阳能电池显示文摘本文以低比例的磷光材料作为给体,制备了基于MoOx/C60:x%Ir(ppy)3的有机太阳能电池(OPV)器件.其中,C60为高比例的受体材料,金属配合物Ir(ppy)3为低比例的给体材料,MoOx为阳极缓冲层.通过一系列不同Ir(ppy)3比例的OPV器件对比研究,得出了最优器件结构.研究发现,当Ir(ppy)3比例足够小时,器件表现为肖特基势垒,开路电压(VOC)较大,短路电流(JSC)较小;随着Ir(ppy)3比例的增加,VOC逐渐减少,而JSC逐渐增大;当进一步增加Ir(ppy)3比例时,VOC趋于稳定,JSC开始减小.结果显示,5%Ir(ppy)3比例的器件性能最佳,效率达1.7%.为了使器件效率得到进一步提升,本研究组采用吸收光谱范围比C60更宽的C70作为受体材料,使光电转换效率进一步提升至3.0%. | 陈艳 李欣 密保秀 高志强 | 2014 | 中国科学:化学2014，44，7： | 0 |
| 4 | 三苯胺为中心核的咔唑树枝状主体材料的合成与性能表征显示文摘以三苯胺为中心核,第二代的齐聚咔唑为树枝,设计合成了树枝状主体材料H2A。树枝状化合物H2A具有良好的成膜性和优异的热稳定性(Tg=351℃),其三线态能级为2.84 eV。采用H2A作为蓝光铱配合物双(4,6-二氟苯基吡啶-N,C2)吡啶甲酰合铱(FIrpic)的主体材料,制得的蓝光磷光器件的启亮电压为4.8V,最大功率效率为7.0 lm/W,两项指标均优于以4,4',4″-三(N-咔唑基)三苯胺(TCTA)为主体材料的相应器件(6.0 V,6.1 lm/W)。 | 王兴东 王淑萌 马志华 丁军桥 王利祥 景遐斌 王佛松 | 2014 | 应用化学2014，31，6： | 0 |
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