A New Yellow Emissive Fluorescent Material for Highly Efficient Organic Light-Emitting Diodes

Abstract

A new yellow fluorescent material, (2Z)-3-[4,4″-bis(dimethylamino)-1,1′:4′,1″-terphenyl-2′-yl]-2-phenylacrylonitrile (BDAT-P), was synthesized for organic light-emitting diodes. This compound has an electron donor-acceptor group which leads to intramolecular charge transfer property.

Optoelectronic properties of a device with the structure of ITO/NPB/MADN:BDAT-P (x %)/BPhen/Liq/Al were measured and the measurement demonstrated that the device using BDAT-P as a dopant revealed highly efficient device performance with greenish yellow electroluminescent emission. Maximum luminance of the device was measured to be 18300 (x = 8%), 10880 (x = 12%) and 11810 (x = 16%) cd/m², respectively. The maximum luminous and quantum efficiency values were observed to be 12.5 (x = 8%), 9.17 (x = 12%) and 12.79 (x = 16%) cd/A, and 3.83 (x = 8%), 2.8 (x = 12%) and 3.81 (x = 16%) %, respectively. The device emitted greenish yellow light corresponding to Commission Internationale de I'Eclairage (CIE_xy) coordinates of (0.319, 0.569) (x = 8%) and (0.321, 0.569) (x = 12%) and (0.356, 0.578) (x = 16%) at 10 V.

Keywords:

• BDAT-P
• organic light-emitting diode
• yellow dopant
• yellow emissive

Acknowledgment

This work was supported by National Research Foundation of Korea Grant funded by the Korean Government (2010-0023836).