New blue-violet emitters based on an indenopyrazine core for OLEDs: Effects of the position of m-terphenyl side group substitution on optical and electroluminescence properties
作者:Youngil Park、Sookang Kim、Ji-Hoon Lee、Dong Hyun Jung、Chung-Chih Wu、Jongwook Park
DOI:10.1016/j.orgel.2010.01.030
日期:2010.5
m-terphenyl side groups in the ortho, meta, or para positions. There are larger blue shifts in the UV–visible absorption and PL spectra of the synthesized ortho- and para-substituted derivatives than in those of the meta-substituted derivative. Molecular calculations verified that these differences are due to the variation in the π-conjugation length of the derivatives with the position at which the
基于新的功能性核心,indenopyrazine基团A类有希望的蓝紫色发射器,已经成功地合成了在第一次通过用笨重取代米的三联苯侧基的邻位,间位,或对位的位置。合成的邻位和对位取代衍生物的紫外可见吸收光谱和PL光谱中的蓝移比间位衍生物的蓝移大取代的衍生物。分子计算证实了这些差异是由于衍生物的π-共轭长度随侧基连接到茚并吡嗪核上的位置而变化。当将合成的化合物用作非掺杂的OLED器件中的发光层时,观察到它们的光学性质相关的趋势。特别地,发现包含对位取代的衍生物的OLED具有优异的特性,具有423nm的最大EL发射,42nm的半峰全宽,具有CIE坐标(0.173,0.063)的纯紫光发射。外部量子效率为1.88%。