8 research outputs found
Enhanced black state induced by spatial silver nanoparticles in an electrochromic device
The use of three-dimensional (3D) hierarchical indium tin oxide (ITO) branches of electrochromic devices (ECDs) is an effective approach for increasing the optical properties via localized surface plasmon resonance compared with two- dimensional nanostructured electrodes. ECDs with 3D branches were designed to operate in transparent, mirror and black states. Finite- difference time- domain simulation was used to find the electrical field distributions in three types of ECD: glass/ITO with Ag film, glass/ITO branches and glass/ITO branches with Ag nanoparticles. The ECDs had an optical transmittance of 73.76% in the transparent state, a reflectance of 79.77% in the mirror state and a reflectance of 8.78% in the black state. We achieved an ECD with high stability that can show similar to 10 000 switching cycles among the three states.113Ysciescopu
P-129: The Effect of Front Dielectric Thickness on Luminous Efficacy in AC PDP with Auxiliary Electrode
P-134: Dependency of Auxiliary Pulse Width on Luminous Efficacy in AC Plasma Display Panel
Completely Hazy and Transparent Films by Embedding Air Gaps for Elimination of Angular Color Shift in Organic Light-Emitting Diodes
Red, green, and blue top-emission organic light-emitting diodes (RGB TOLEDs) suffer from white color change with viewing angle due to the microcavity effect, called white angular dependence (WAD). Great efforts are devoted by applying various kinds of hazy films, but they suffer from poor mechanical stability and optical transmittance. Herein, we introduce an air-gap-embedded hazy film (AEHF) to solve these problems and suppress WAD in RGB TOLEDs. The AEHF is designed with optical simulation to realize high haze with transparency. By tuning geometries of the air gap inside the polymer, the AEHF realizes high haze of more than 90% in all RGB colors while maintaining high transparency. To experimentally demonstrate the AEHF, the O-2 plasma is treated on a polymer film with AgCl as an etching mask to fabricate microstructures with high aspect ratios. Afterward, PDMS is coated on the patterned surface; air gaps develop spontaneously in the valleys between microstructures during the coating process. Using these processes, an air gap with 1.2 mu m size and 400 nm period is formed inside the film and similar to 100% haze is achieved while maintaining a high transmittance of 88%; these results agree well with rigorous coupled wave analysis results. By utilizing the AEHF into TOLEDs, the WAD can be drastically suppressed by 95.2% compared with that of a device without AEHF.11Nsciescopu
P-91 : AC Plasma Display Panel with Gold Nano-particles Inserted into an MgO Protective Layer
Optical Enhancement in Optoelectronic Devices Using Refractive Index Grading Layers
We enhanced the optical transmittance
of a multilayer barrier film by inserting a refractive index grading
layer (RIGL). The result indicates that the Fresnel reflection, induced
by the difference of refractive indices between Si<sub><i>x</i></sub>N<sub><i>y</i></sub> and SiO<sub>2</sub>, is reduced
by the RIGL. To eliminate the Fresnel reflection while maintaining
high transmittance, the optimized design of grading structures with
the RIGL was conducted using an optical simulator. With the RIGL,
we achieved averaged transmittance in the visible wavelength region
by 89.6%. It is found that the optimized grading structure inserting
the multilayer barrier film has a higher optical transmittance (89.6%)
in the visible region than that of a no grading sample (82.6%). Furthermore,
luminance is enhanced by 14.5% (from 10 190 to 11 670
cd m<sup>–2</sup> at 30 mA cm<sup>–2</sup>) when the
grading structure is applied to organic light-emitting diodes. Finally,
the results offer new opportunities in development of multilayer barrier
films, which assist industrialization of very cost-effective flexible
organic electronic devices