Simple Bipolar Hosts with High Glass Transition Temperatures Based on 1,8-Disubstituted Carbazole for Efficient Blue and Green Electrophosphorescent Devices with “Ideal” Turn-on Voltage
作者:Hong Huang、Yixin Wang、Biao Pan、Xiao Yang、Lei Wang、Jiangshan Chen、Dongge Ma、Chuluo Yang
DOI:10.1002/chem.201202329
日期:2013.1.28
Two hybrids based on 1,8‐disubstituted carbazole, 1,8‐OXDCz and 1,8‐mBICz, have been designed and synthesized through a facile process. The incorporation of oxadiazole or N‐phenylbenzimidazole moieties at the 1,8‐positions of carbazole greatly improves its morphological stability, giving glasstransitiontemperatures (Tg) as high as 138 and 154 °C, respectively. Blue phosphorescent organic light‐emitting
设计了两种基于1,8-双取代咔唑的杂种1,8-OXDCz和1,8-mBICz,并通过简便的方法进行了合成。在咔唑的1,8位上引入恶二唑或N-苯基苯并咪唑基团可极大地改善其形态稳定性,从而使玻璃化转变温度(T g)分别高达138和154°C。具有1,8-mBICz的蓝色磷光有机发光器件(PhOLED)与基于mCP主体的结构相似的器件几乎具有相同的性能,而采用新型主体材料1,8-OXDCz的绿色PhOLED具有理想的转向性能。开启电压(1.58 cd m -2时为2.5 V),最大电流效率(η C,最大值73.9光盘的)-1,以及功率效率(η P,最大89.7流明W的)-1。这些结果是具有简单设备配置的基于[Ir(ppy)3 ]的设备的最佳性能之一。
Torsional Control of Frustrated Lewis Pair Behaviour Involving PNP‐type Phosphines
constrained torsionally to the plane containing the NMe unit. In terms of potential frustrated Lewis pair (FLP) reactivity, the conformationally more flexible systems based on an acyclic linker or a cyclic core featuring a 7-memberedring, are capable of achieving P−B bond formation and generating a classical Lewis adduct with B(C6F5)3. The less flexible carbazole-derived compound (featuring a five membered
Disclosed is a thermally activated delayed fluorescence material capable of improving luminous efficiency and stability, a polymer, a mixture, a formulation, and an organic electronic device comprising the same. This thermally activated delayed fluorescence material comprises a conjugated unit comprising at least two aromatic rings or heteroaromatic rings, so as to achieve thermally activated delayed fluorescence (TADF) characteristics. This thermally activated delayed fluorescence material can be used as a TADF luminescent material to improve the luminous efficiency and stability of the electroluminescent device containing such a thermally activated delayed fluorescence material by cooperating with a suitable host material, thereby providing a solution of the luminescent device which has low manufacturing cost, a high efficiency, a long life, and being low in roll-off.