Ma Dongxin, Duan Lian, Qiu Yong
Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
Dalton Trans. 2016 Apr 14;45(14):6118-23. doi: 10.1039/c5dt03776j. Epub 2015 Nov 17.
Spin-cast from various solvents, emissive layers show different film morphologies and performances in solution-processed organic light-emitting diodes (OLEDs). Here we fabricated and demonstrated highly efficient blue OLEDs based on bis[3,5-difluoro-2-(2-pyridyl)phenyl]-(2-carboxypyridy)iridium(iii) by choosing several kinds of solvents for spin-coating. Experiments indicate that the single-layer device with an emissive film cast from chlorobenzene shows its best performance with a highest current efficiency of 18.99 cd A(-1), a maximum luminance of 20.5 × 10(3) cd m(-2) and an emission band centered at 474 nm. The efficiency achieved is the highest reported for solution-processed simple-manufactured OLEDs doped with transition metal phosphors emitting in the blue region.
通过从各种溶剂中旋涂，发光层在溶液处理的有机发光二极管（OLED）中呈现出不同的薄膜形态和性能。在此，我们通过选择几种用于旋涂的溶剂，制备并展示了基于双[3,5-二氟-2-(2-吡啶基)苯基]-(2-羧基吡啶基)铱(III)的高效蓝色OLED。实验表明，用氯苯旋涂形成发光薄膜的单层器件表现出最佳性能，其最高电流效率为18.99 cd A⁻¹，最大亮度为20.5×10³ cd m⁻²，发射带中心位于474 nm。所实现的效率是报道的溶液处理的简单制造的掺杂过渡金属磷光体且在蓝色区域发光的OLED中最高的。
