Simultaneous enhancement of photo- and electroluminescence in white organic light-emitting devices by localized surface plasmons of silver nanoclusters

Abstract

White organic light-emitting devices (WOLEDs) with enhanced current efficiency and negligible color shifting equipped with an internal color conversion layer (CCL) were fabricated. They were attained by embedding a single layer of silver nanoclusters (SNCs) between the CCL and light-emitting layer (EML). The simultaneous enhancement of the photoluminescence (PL) of the CCL and electroluminescence (EL) of the EML were realized by controlling the thickness and size of the SNCs to match the localized surface plasmon resonance spectrum with the PL spectrum of the CCL and the EL spectrum of the EML. The WOLED with optimal SNCs demonstrated a 25.81% enhancement in current efficiency at 60 mA cm and good color stability over the entire range of current density.

Integration of Optical and Thermal Models for Organic Light-Emitting Diodes

“…Since FEM is one of the approaches that can deal with such EM-wave issues, the proposed model, which integrates FEM and ray optics, provides compatibility for these interlayer investigations. Another example arises from the insufficient efficiency of OLEDs, while nano-techniques, such as surface plasma polaritons and graphene quantum dots [26][27][28], are investigated for new solutions. Then, there exist modeling demands for these nano-structures.…”

Nanophotonics for current and future white light-emitting devices

“…at the appropriate device depth. An example is the introduction of a single film of metallic NPs to enhance simultaneously the EL from the blue emitting layer of an OLED as well as the PL of the red color converting adjacent layer 92 leading to a 26% improvement in current efficiency. For the case of QLEDs where green and red CCLs are sequentially deposited on top of a blue LED, a proper design of two NP arrays to improve the QY of each type of QD has been demonstrated 93 opening the path toward a design concept which could find application in commercial QLEDs present in TV displays.…”