Performance of Organic Light-Emitting Diodes Using an Emissive Material with High Hole Drift Mobility

Abstract

This study focuses on the performance of organic light-emitting diodes (OLEDs) using an emissive material with high hole drift mobility, tris[4-(5-phenylthiophen- 2-yl)]amine (TPTPA), which exhibits the highest level of hole drift mobility (1.0 × 10⁻² cm² V⁻¹ s⁻¹) among those reported for organic disordered systems. Clear blue emission was observed from TPTPA which was used as the hole transporting and emissive layer in the OLEDs. The maximum luminance of 1.2 × 10⁴ cd/m², and the maximum current efficiency of 3.9 cd/A were achieved. The short response times of electroluminescence (ca. 10 ns) were achieved under the application of rectangular-shaped voltages.

Keywords:

• High hole drift mobility
• organic light-emitting diode
• transient characteristic
• tris[4-(5-phenylthiophen-2-yl)]amine

Acknowledgment

This research was partially supported financially by the Ministry of Education, Culture, Sports, Science and Technology in Japan under a Grant-in-Aid for Scientific Research (A) #20246058 and under a grant for the Osaka University Global COE Program, “Centre for Electronic Devices Innovation.”