Double-layer printed white organic light-emitting diodes based on multicomponent high-performance illuminants

Abstract

Due to its high material utilization and large-scale producibility, inkjet printing of organic lightemitting diodes (OLEDs) has generated significant interest from the scientific community and industry. In this study, double-layer printed white OLEDs (WOLEDs) based on multicomponent illuminants were designed and fabricated for the first time. As a result, the binary WOLEDs, based on Firpic and Ir(bt) 2 (acac) as dopants, reached a maximum current efficiency (CE max ) of 17.5 cd A −1 and a maximum luminance (L max ) of 15 320 cd m −2 . The ternary WOLEDs, based on Firpic, Ir(bt) 2 (acac) or Ir(mppy) 3 and RD01 as dopants, exhibited CE max of 7.9 versus 2.9 cd A −1 , and L max of 9587 versus 6752 cd m −2 , respectively. As the multicomponent illuminants increased from binary to ternary, the corresponding color rendering index was enhanced from 60 to 75.

Improving the bending resistance of double-layer printed flexible OLEDs with PEDOT: PSS-PEO composite HIL films

“…without PEO, used a spin coating speed of 4000 rpm to obtain a film thickness of 25 nm. (According to previous work, 4000 rpm speed process is the optimal speed for the normal device without PEO [31]). Next, the FOLEDs based on P + P films with different thickness were prepared and tested, and the performance of these devices before and after bending were summarized in table 2.…”

A triple layer printed blue OLED with blurred interface

“…Based on double-layer printed monochrome and white OLED [15][16][17], whereas both hole injection layer (HIL) and EML were printed and a blended host was used for EML, our research group further proposed a concept of 'blurred interface' to realize a triple-layer printed OLED [18]. 'Blurred interface' appeared at the interfaces of EML and HTL, when printing HTL and EML in same solvent, using the blend of HTL and ETL materials as the host for EML.…”

Investigation on electrohydrodynamic printing of conductors in display backplane circuits

“…Printing as an alternative technology for electronics manufacturing has been developed for over a decade. Printed electronics has become an established field of research [10][11][12][13][14][15][16][17][18][19][20]. low-cost operation.…”