title: Boron-bridged π-conjugated ladders as efficient electron-transporting emitters.
abstract: Four diboron-bridged ladder molecules 1-4 have been designed and synthesized. X-ray diffraction analysis revealed that the bulky phenyl substituents on boron centers efficiently prevented π stacking of the luminescent ladder unit. Characterizations of these complexes demonstrated that the construction of diboron-containing ladder-type skeletons endowed these materials with good thermal stability, high fluorescence quantum yields, and strong electron affinity. The highly efficient nondoped organic light-emitting diodes using complexes 1 and 2 as electron-transporting emitters exhibited maximum luminance values of 16,930 and 18,060 cd/m(2) with turn-on voltages of 3.5 and 2.5 V as well as maximum luminous efficiencies of 6.4 and 5.4 cd/A, respectively.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Di
authors.initials: D
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Yuan
authors.forename: Hai
authors.initials: H
authors.lastname: Bi
authors.forename: Dandan
authors.initials: D
authors.lastname: Yao
authors.forename: Xingjia
authors.initials: X
authors.lastname: Zhao
authors.forename: Wenjing
authors.initials: W
authors.lastname: Tian
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.forename: Hongyu
authors.initials: H
authors.lastname: Zhang