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论文类型：期刊论文

发表时间：2012-01-01

发表刊物：DYES AND PIGMENTS

收录刊物：SCIE、EI

卷号：92

期号：1

页面范围：674-680

ISSN号：0143-7208

关键字：Thieno-[3,4-b]-pyrazine; Red; Organic light-emitting diodes; Solution processing; Vacuum evaporation; Large Stokes shift

摘要：Two novel red-emitting thieno-[3,4-b]-pyrazine-cored molecules with phenyls (TP) or polyphenyls (Mullen type dendron, DTP) as peripheral groups were designed and synthesized. They have large Stokes shifts over 100 nm. DTP is thermally stable with decomposition temperature up to 458 degrees C. More importantly, it is amorphous with a remarkably high glass transition temperature of 262 degrees C. DTP can be made into thin films either by solution method or vacuum evaporation. Red OLEDs were fabricated using either spin coated or vacuum evaporated DTP film as emitting layer. The evaporated device exhibited a maximum brightness of 1753 cd m(-2) and a luminous efficiency of 0.74 cd A(-1), which are among the best data ever reported for thieno-[3,4-b]-pyrazine derivatives so far. In contrary, TP failed to produce satisfied red emission in its evaporated OLEDs. (C) 2011 Elsevier Ltd. All rights reserved.