Highly efficient white organic light - emitting device using a single emitter

摘要

White organic light - emitting devices (WOLEDs) can be fabricated using a simple, low - cost device structure with a single uniformly doped emissive layer. The Pt - 17 emitter used in these devices obtains excellent color rendering (CRI = 80) as well as bright white electropho- sphoresence (CIE x = 0.37, y = 0.40) by combining efficient monomer and efficient excimer emission as demonstrated by excellent external quantum efficiency (next = 15.9%). The Pt-17 based WOLED is also compatible with state-of-the-art charge injection and blocking materials as well as high out-coupling device structures. Application of these existing technologies is expected to extend luminance efficiencies of Pt-17 devices to world-class values (46 Im/W and 100 Im/W respectively). In addition to avoiding the difficulty and cost of fabricating more complex device structures, the color of a single-doped device also is uniquely independent of voltage, current density, and age. Molecules like fluorine-free Pt-17 are uniquely positioned to utilize excimer emissions in order to reduce manufacturing costs and provide solutions to satisfy many of the requirements for the next generation of organic solid-state lighting.