4-(2-(4′-(2,2-diphenylvinyl)biphenyl-4-yl)vinyl)-N,N-diphenylaniline Derivatives for Blue Organic Light-Emitting Diodes

Abstract

This paper reports the synthesis and electroluminescent properties of the new blue fluorescent diphenylaniline derivatives end-caped with various aryl groups. Multilayered OLEDs were fabricated using these materials as dopants in ADN host, with the configuration of ITO/DNTPD (40 nm)/NPB (20 nm)/ADN: Blue dopants 1–4 (20 nm)/Alq₃ (40 nm)/Liq (1.0 nm)/Al. All devices showed the efficient blue emissions. Among these devices, the devices C as a dopant exhibited blue emission with the luminance of 18020 cd/m² at 11v, the luminous efficiency of 9.6 cd/A at 20 mA/cm², the power efficiency of 3.91 lm/W at 20 mA/cm². In addition, the device D exhibited deep blue emisson with CIE coordinates of (0.151, 0.134) at 8 V showed a luminous efficiency of 5.3 cd/A and power efficiency of 2.3 lm/W at 20 mA/cm².

Keywords:

• Blue OLEDs
• fluorescent dopant
• styrylarylene derivatives
• unsymmetrical structure

Acknowledgment

This research (S2012-0870-000) was supported by the MKE (The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center)/CITRC (Convergence Information Technology Research Center) support program (NIPA-2012-H0301-12-4013) supervised by the NIPA (National IT Industry Promotion Agency).