首个基于激基复合物的串联式白光有机发光二极管。

The first tandem, all-exciplex-based WOLED.

作者信息

Hung Wen-Yi, Fang Guan-Cheng, Lin Shih-Wei, Cheng Shuo-Hsien, Wong Ken-Tsung, Kuo Ting-Yi, Chou Pi-Tai

机构信息

Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, 20224, Taiwan.

Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan.

出版信息

Sci Rep. 2014 Jun 4;4:5161. doi: 10.1038/srep05161.

Exploiting our recently developed bilayer interface methodology, together with a new wide energy-gap, low LUMO acceptor (A) and the designated donor (D) layers, we succeeded in fabricating an exciplex-based organic light-emitting diode (OLED) systematically tuned from blue to red. Further optimization rendered a record-high blue exciplex OLED with η(ext) of 8%. We then constructed a device structure configured by two parallel blend layers of mCP/PO-T2T and DTAF/PO-T2T, generating blue and yellow exciplex emission, respectively. The resulting device demonstrates for the first time a tandem, all-exciplex-based white-light OLED (WOLED) with excellent efficiencies η(ext): 11.6%, η(c): 27.7 cd A(-1), and η(p): 15.8 ml W(-1) with CIE(0.29, 0.35) and CRI 70.6 that are nearly independent of EL intensity. The tandem architecture and blend-layer D/A (1:1) configuration are two key elements that fully utilize the exciplex delay fluorescence, providing a paragon for the use of low-cost, abundant organic compounds en route to commercial WOLEDs.

利用我们最近开发的双层界面方法，结合一种新型的宽能隙、低最低未占分子轨道（LUMO）受体（A）和指定的供体（D）层，我们成功制备了一种基于激基复合物的有机发光二极管（OLED），其发光颜色可从蓝色系统地调节到红色。进一步优化后得到了一种外量子效率（η(ext)）高达8%的创纪录的蓝色激基复合物OLED。然后，我们构建了一种由mCP/PO-T2T和DTAF/PO-T2T的两个平行混合层组成的器件结构，分别产生蓝色和黄色激基复合物发射。所得器件首次展示了一种串联的、基于全激基复合物的白光OLED（WOLED），其具有优异的效率：η(ext)为11.6%，η(c)为27.7 cd A(-1)，η(p)为15.8 lm W(-1)，色坐标为CIE(0.29, 0.35)，显色指数为70.6，且几乎与电致发光强度无关。串联结构和混合层的供体/受体（1:1）配置是充分利用激基复合物延迟荧光的两个关键要素，为在商业WOLEDs发展道路上使用低成本、丰富的有机化合物提供了一个典范。