摘要磷光和热激活延迟荧光(TADF)发射器可以突破自旋统计规则,并在外部量子效率(超过5%)方面取得巨大成功。然而,在有机发光二极管的应用中,在高亮度下保持高效率是巨大的挑战。因此,我们报道了两种菲并咪唑衍生物PPI-An-CN和PPI-An-TP,即使在1000 cd / cm2的高亮度下也能保持极低的效率滚降,并保持了约99%的最大外部量子效率(EQEmax)。基于非掺杂的器件。当在CBP(4,4'-bis(N-carbazolyl)-1,1'-biphenyl)中掺杂两种材料时,掺杂的器件在高亮度下仍表现出出色的稳定性,CIEy≈0.07,低导通电压仅为2.8伏 最新的低效率滚降使新材料对潜在应用具有吸引力。这是首次使用片段贡献分析方法来分析OLED领域中分子的激发态特性,这有助于我们更直观,更深入地了解该机理。
Sterically enhanced 2‐iminopyridylpalladium chlorides as recyclable ppm‐palladium catalyst for Suzuki–Miyaura coupling in aqueous solution
作者:Wenhua Lin、Liping Zhang、Yanping Ma、Tongling Liang、Wen‐Hua Sun
DOI:10.1002/aoc.6474
日期:2022.1
2-iminopyridine derivatives and their palladium chlorides complexes are designed and prepared, which efficiently promote the Suzuki–Miyauracoupling (SMC) reaction in aqueous solution. Besides the good to excellent yields and broad substrate scope, these catalysts can be reused for at least four new batches of the substrates. Spontaneous separation of coupling products in the aqueous reaction medium is
When Anthracene and Quinone Avoid Cycloaddition: Acid-Catalyzed Redox Neutral Functionalization of Anthracene to Aryl Ethers
作者:Nan Ding、Zhi Li
DOI:10.1021/acs.orglett.0c01315
日期:2020.6.5
under acid catalysis. Instead, 9-anthracenyl aryl ethers are obtained as unexpected products. Mechanistic studies indicate that the reaction likely undergoes an ionic mechanism between protonated anthracene species and nucleophilic oxygen of 1,4-benzoquinone or 1,4-hydroquinone. A variety of 9-anthracenyl aryl ethers are constructed with this method. Produced anthracenyl aryl ethers are potential scaffolds
Highly efficient deep-blue fluorescence OLEDs with excellent charge balance based on phenanthro[9,10-<i>d</i>]oxazole-anthracene derivatives
作者:Seokwoo Kang、Jin-Suk Huh、Jang-Joo Kim、Jongwook Park
DOI:10.1039/d0tc01811b
日期:——
Two blue fluorescent materials, m-PO-ABN and p-PO-ABN, are newly synthesized by controlling the conjugation length based on different linkages of the meta or para position between the phenanthro[9,10-d]oxazole (PO) moiety and anthracene substituted with a cyano group. The two materials emit deep-blue light with a high photoluminescence quantum yield (PLQY) in solution state. Non-doped devices fabricated
通过基于菲咯[9,10- d ]恶唑(PO)部分之间的间位或对位的不同键控控制共轭长度,新合成了两种蓝色荧光材料,m -PO-ABN和p -PO-ABN蒽被氰基取代。两种材料在溶液状态下发出深蓝色光,并具有高的光致发光量子产率(PLQY)。使用m -PO-ABN和p -PO-ABN制造的非掺杂器件显示在448和460 nm处的EL峰分别对应于国际照明委员会(CIE)坐标(0.148,0.099)和(0.150,0.164)。对于m -PO-ABN和p -PO-ABN而言,器件的外部量子效率(EQE)值分别为5.9%和5.3%。瞬态EL测量和光学计算结果表明,两种材料在器件中均显示出良好的电荷平衡和三重态-三重态an灭,这可能是由于PO和氰基部分的插入而增强了双极特性。