Resonance‐Based Directional Light Emission from Organic Light‐Emitting Diodes: Comparing Integrated Nanopatterns and Color Conversion Waveguide Gratings

Highly Directional Emission and Beam Steering from Organic LightEmitting Diodes with a Substrate Diffractive Optical Element

In planar OLED structures, a signifi cant fraction of the internal light emission is trapped in guided modes. This trapped light is a major limitation on the external quantum effi ciency, and a number of studies have integrated photonic microstructures into OLEDs to improve the device effi ciency by extracting trapped light such as the substrate modes, [ 3 ] the waveguide modes [ 4 ] and the su...

Organic light-emitting diodes with integrated inorganic photo detector for near-infrared optical up-conversion

We report a hybrid up-conversion device integrating a In0.2Ga0.8As/GaAs MQWs photodetector with an organic light emitting diode (OLED), that converts input 980 nm infrared light to output 520 nm green light. Devices with different interface layer, used as the hole injection layer (HIL) in OLEDs were fabricated and tested. It was found that the device with an HIL of MoO3-doped CuPc exhibited a l...

Integrated three-color organic light-emitting devices

We report a demonstration of the integration of individual polymer-based light emitting devices of three different colors on the same substrate. Orange, green, and blue color devices are sequentially fabricated on the same indium–tin oxide ~ITO! coated glass substrate coated with a patterned insulator on the ITO, by the spin coating of polymer thin films, the vacuum deposition of top metal cont...

Color tunable organic light emitting diodes using Eu complex doping

A voltage-controlled color tunable organic light emitting device has been demonstrated by using a co-evaporated emissive layer of NPB [(N,N 0-bis(naphthalene-1-yl)-N,N 0-bis(phenyl)benzidine)] and an organic Eu complex. As a result of minimized energy transfer from the host (NPB) to the guest emitter (Eu complex), this device can vary the light emission from vivid red to deep blue with increasi...

Organic light-emitting diodes with a spacer enhanced exciplex emission