The Influence of Metal-Organic Layer-Metal Plasmonic Structure on the Emitting Properties of Organic Light-Emitting Diodes

When an interface that exhibits a negative and a positive dielectric constants on the opposite sides, a particular class of guided modes, surface plasma waves (SPWs), can exist on that interface. The quantization of this wave is called surface plasmon-polariton (SPP). Recently, the Purcell effect of SPWs has been demonstrated to be able to increase the spontaneous emission rate of a radiating dipole in the region neighboring to the interface. However, the intrinsic properties of SPWs, including non-radiative property and limited resonant energies, limit the possible applications of Purcell effect of SPWs to a real device. According to our previous investigation, we found that all the restrictions resulting from the traditional SPW structure can be overcome by using the metal-dielectric-metal SPW structures. Thus, it is important to realize how the benefits that can be achieved by using the novel structures to real light-emitting devices. Three aspects of these applications are proposed. The first one is the use of metal-organic light-emitting layer-metal (MOM) structures to increase the power efficiencies of organic light-emitting devices (OLEDs). The second one is the use of MOM structures to modify the emitting spectra of the imbedded organic layers. The success of this aspect would render an extended applicable wavelength region to an existing organic light-emitting material. The last one is the attempt to fabricate a MOM white light source that possesses only single light-emitting layer. The white light can be formed by the hybrid of the original spectrum and the MOM structure-modified spectrum of the light-emitting layer. It is in large contrast to the traditional tandem structure that possesses at least two light-emitting layers with different light-emitting wavelengths. Thus, all the associated drawbacks and difficulties arising from tandem structures can be prevented by the novel structures.

Project ID:PB10408-5718
External Project ID:MOST104-2221-E182-046-MY2