Carrier balance is essential to obtain efficient emission in polymer light-emitting diodes (PLEDs). A new polymer 3P5O composed of alternating p-terphenyl and tetraethylene glycol ether segments is designed and synthesized by the Suzuki coupling reaction and successfully employed as hole-buffer layer to improve carrier balance. Multilayer PLEDs [ITO/PEDOT:PSS/3P5O/SY/LiF/Al], with Super Yellow (SY) as the emitting layer and 3P5O as the hole-buffer layer, reveal maximum luminance (17,050 cd/m2) and maximum current efficiency (6.6 cd/A) superior to that without the hole-buffer layer (10,017 cd/m2, 3.0 cd/A). Moreover, it also shows better performance than that using conventional BCP as hole-blocking layer [ITO/PEDOT:PSS/SY/BCP/LiF/Al (80 nm): 13,639 cd/m2, 4.1 cd/A]. The performance enhancement has been attributed to hole-buffering characteristics of 3P5O that results in improved carrier recombination ratio and wider carrier recombination region. Current results indicate that the 3P5O is a promising hole-buffer polymer to enhance the performance of optoelectronic devices.
|Number of pages||10|
|Journal||Journal of Polymer Science, Part A: Polymer Chemistry|
|Publication status||Published - 2016 Mar 15|
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry