Nano-Alignment in Semiconducting Polymer Films:A Path to Achieve High Current Density and Brightness in Organic Light Emitting Transistors

Author:

Chaudhry, Mujeeb Ullah  Muhieddine, Khalid  Wawrzinek, Robert  Li, Jun  Lo, Shih-Chun  Namdas, Ebinazar B.  

Journal:

ACS PHOTONICS

Issue Date:

2018

Abstract(summary):

Organic light emitting field effect transistors (LEFETs) integrate light emission of a diode with logic functions of a transistor into a single device architecture. This integration has the potential to provide simplified displays at low costs and access to injection lasing. However, the charge carrier mobility in LEFETs is a limiting factor in realizing high current densities along with a trade-off between brightness and efficiency. Herein, we present a technique controlling the nanoscale morphology of semi-conducting polymers using nanoscale grooved substrates and dip-coating deposition to achieve high current density. We then applied this approach to heterostructure LEFETs and demonstrated brightness exceeding 29000 cd m(-2) at an EQE of 0.4% for a yellow emitter and 9600 cd m(-2) at an EQE of 0.7% for a blue emitter. These results represent a significant advancement in organic optoelectronics and are an important milestone toward the realization of new applications in displays and electrically pumped lasing.

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