Guo Xin, Cheng Yanxiang, Xie Zhiyuan, Geng Yanhou, Wang Lixiang, Jing Xiabin, Wang Fosong
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China; Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China.
Macromol Rapid Commun. 2009 May 19;30(9-10):816-25. doi: 10.1002/marc.200800765. Epub 2009 Mar 17.
By incorporating a new building block, 7,7,15,15-tetraoctyldinaphtho-s-indacene (NSI), into the backbone of poly(9,9-dioctylfluorene) (PFO), a novel series of blue light-emitting copolymers (PFO-NSI) have been developed. The insertion of the NSI unit into the PFO backbone leads to the increase of local effective conjugation length, to form low-energy fluorene-NSI-fluorene (FNF) segments that serve as exciton trapping sites, to which the energy transfers from the high-energy PFO segments. This causes these copolymers to show red-shifted emissions compared with PFO, with a high efficiency and good color stability and purity. The best device performance with a luminance efficiency of 3.43 cd · A(-1) , a maximum brightness of 6 539 cd · m(-2) , and CIE coordinates of (0.152, 0.164) was achieved.
通过将一种新的结构单元7,7,15,15-四辛基二萘并-s-茚（NSI）引入聚（9,9-二辛基芴）（PFO）的主链中，开发了一系列新型蓝光发射共聚物（PFO-NSI）。将NSI单元插入PFO主链导致局部有效共轭长度增加，形成低能量芴-NSI-芴（FNF）链段作为激子捕获位点，高能PFO链段的能量向其转移。这使得这些共聚物与PFO相比呈现红移发射，具有高效率以及良好的颜色稳定性和纯度。实现了最佳器件性能，其发光效率为3.43 cd·A⁻¹，最大亮度为6539 cd·m⁻²，CIE坐标为（0.152, 0.164）。
