Ye, Shaofeng; Wang, Yaxiong; Guo, Runda; Zhang, Qing; Lv, Xialei; Duan, Yalei; Leng, Panpan; Sun, Shuaiqiang; Wang, Lei published their research in Chemical Engineering Journal (Amsterdam, Netherlands) on August 1 ,2020. The article was titled 《Asymmetric anthracene derivatives as multifunctional electronic materials for constructing simplified and efficient non-doped homogeneous deep blue fluorescent OLEDs》.Formula: C18H14BrOP The article contains the following contents:
Large π-conjugated core anthracene with an innate bipolar property was used to construct multifunctional organic electronic materials. Delicate manipulating mols. via combining anthracene core and large periphery groups, 2 asym. anthracene derivatives (4-(10-(4-(9H-1,5-diazacarbazol-9-yl)phenyl)anthracen-9-yl)phenyl)diphenylphosphine oxide (p-PO15NCzDPA) and (3-(10-(3-(9H-1,5-diazarcarbazol-9-yl)phenyl)anthracen-9-yl)phenyl)diphenylphosphine oxide (m-PO15NCzDPA) were firstly designed and developed. The large periphery groups 1,5-diazarcarbazole (15NCz) and diphenylphosphine oxide (PO) efficiently interrupt the intramol. π-conjugation, presenting an asym. bulky periphery enveloping strategy achieving highly twisted structures, which help to realize deep-blue emission. Due to the high PLQY and well-balanced bipolar transport characteristics, desired device addressing the contradiction of efficiency, color gamut and structure complexity is within reach. Detailed device engineering study was carried out, in which p-PO15NCzDPA and m-PO15NCzDPA were functioned as multifunction layers. As expected, p-PO15NCzDPA-based homogeneous and unilateral homogeneous OLEDs exhibited outstanding performance with impressive EQEmax of 4.55 and 6.40%, deep blue CIE coordinates of (0.152, 0.075) and (0.151, 0.066) at the voltage of 6 V, narrow FWHM of 46 nm and 50 nm, resp. The simplified homogeneous device achieved extremely low efficiency roll-offs of 1.3 and 4.8% at 1000 and 5000 cd m-2, resp. These results are among the most outstanding performance, which provided a guide for further improving the performance of deep blue fluorescent OLEDs and simplifying the structure of OLEDs. In addition to this study using (3-Bromophenyl)diphenylphosphine oxide, there are many other studies that have used (3-Bromophenyl)diphenylphosphine oxide(cas: 10212-04-1Formula: C18H14BrOP) was used in this study.
(3-Bromophenyl)diphenylphosphine oxide(cas: 10212-04-1) belongs to mono-phosphine Ligands.Phosphine ligands are the most significant class of ligands for cross-coupling because of the alterability of their electronic and steric properties. Ligands play a key role in stabilizing and activating the central metal atom and are used in reactions, such as transition metal catalyzed cross-coupling.Formula: C18H14BrOP
Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI