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Summer Research Fellowship Programme of India's Science Academies

EFFICIENT EXCITON HARVESTING BY HOST-EMITTER INTERACTION IN ORGANIC LIGHT EMITTING DIODES

S. DIANA EMERALD AASHA

Department of Electronics and Communication Engineering, SRM Institute of Technology, Kanchipuram 603203, India

Prof. Parameswar K. Iyer

Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781089, India

Abstract

Efficiency is an important factor in Organic Light Emitting Diodes especially for solid state lighting applications. Various approaches have been proposed to attain high efficiency OLED’s through the optimization of device architecture. In this work, we propose the effect of host and emitter material interaction concept in the emissive layer which improves the efficiency of the light. Here we have used Bis [2-(diphenylphosphino)phenyl] ether oxide (DPEPO) as the host material, which has a high triplet excited state that helps to achieve improved radiative emission. In this report, the OLED device has been fabricated and the improved efficiency was achieved by measuring the brightness, luminous efficiency and current density.

Keywords Host, Emitter material, DPEPO, Exciton, efficiency

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