title: Simultaneous improvement of emission color, singlet-triplet energy gap, and quantum efficiency of blue thermally activated delayed fluorescent emitters using a 1-carbazolylcarbazole based donor.
abstract: Blue thermally activated delayed fluorescent (TADF) emitters having 1-carbazolylcarbazole based donor moieties were developed to resolve the low quantum efficiency and large singlet-triplet energy splitting issues of the linker free TADF emitters. Investigation of the 1-carbazolylcarbazole derived donors as the donor units of two blue TADF emitters in comparison with 3-carbazolylcarbazole demonstrated that the 1-carbazolylcarbazole based donors increased the triplet energy, decreased the singlet-triplet energy gap, blue-shifted the emission color, and enhanced the quantum efficiency of the blue TADF devices.
authors.affiliation: Department of Polymer Science and Engineering, Dankook University, Yongin, Gyeonggi 448-701, Republic of Korea.
authors.forename: Mounggon
authors.initials: M
authors.lastname: Kim
authors.forename: Jeong Min
authors.initials: JM
authors.lastname: Choi
authors.forename: Jun Yeob
authors.initials: JY
authors.lastname: Lee