Excimer-emitting single molecules with stacked π-conjugated groups covalently linked at the 1,8-positions of naphthalene for highly efficient blue and green OLEDs
Excimer-emitting single molecules with stacked π-conjugated groups covalently linked at the 1,8-positions of naphthalene for highly efficient blue and green OLEDs
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DOI：
10.1039/c3tc30319e
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发表时间：
2013-01-01
影响因子：
6.4
通讯作者：
Kido, Junji
中科院分区：
文献类型：
--
作者：
Hu, Jian-Yong;Pu, Yong-Jin;Kido, Junji
Two efficient blue-light-emitting compounds, 1,8-bis(4-(N-carbazolyl) phenyl) naphthalene (BCzPN) and 1,8-bis(4-(10-phenylanthracen-9-yl)-phenyl) naphthalene (BPAPN), are designed and synthesized, in which two phenylcarbazole or diphenylanthracene units are closely stacked through bonding to the 1- and 8-positions of the naphthalene ring, resulting in strong intramolecular excimer emissions in solution or as a film. By utilizing BPAPN as an emitter, high efficiencies of 6 cd A(-1) and 5.8% external quantum efficiency (EQE) at 100 cd m(-2), and 8 cd A(-1) and 5.8% EQE at 1000 cd m(-2) are achieved in a non-doped blue device. By using BCzPN or BPAPN as a host, a DPAVBi-doped BCzPN based blue device gave high efficiencies of 15 cd A(-1) and 6.5% EQE at 100 cd m(-2), and 12 cd A(-1) and 5.5% EQE at 1000 cd m(-1), and a C545T-doped BPAPN based green device gave high efficiencies of 23 cd A(-1) and 6.7% EQE at 100 cd m(-2), and 22 cd A(-1) and 6.7% EQE at 1000 cd m(-2), respectively.
