High efficiency deep-blue and white phosphorescent OLEDs

Abstract

ABSTRACT We report studies on blue and white organic light-emitting devices (OLEDs) based on the deep-blue electro-phosphorescent dye iridium(III) bis(4’,6’-difluorophenylpyridi nato)tetrakis(1-pyrazolyl)borate (FIr6). Using high triplet energy charge transport layers and a dual -emissive-layer structure as well as the p-i-n device structure, we have achieved external quantum efficiencies of 20% and maximum power efficiency of 36 lm/W in these deep-blue OLEDs. White OLEDs with a CRI of 79 and a maximum power efficiency of 40 lm/W were also demonstrated by incorporating red and green phosphorescent dopants together with FIr6. Keywords: Organic light-emitting devices, OLEDs, phosphorescent, charge transport layers, triplet energy, dual emissive layers, p-i-n, quantum efficiency, white OLEDs. 1. INTRODUCTION Organic light-emitting devices (OLEDs) have attracted great a ttention for use in full-color displays and as general solid-state lighting sources. [1,2] The introduction of organic phosphorescent emitters