In order to improve the luminance of blue emission of the plasma display panel (PDP), ${\mathrm{BaMgAl}}_{10}{\mathrm{O}}_{17}:{\mathrm{Eu}}^{2+}$ (BAM) phosphors were synthesized and were coated with ${\mathrm{SiO}}_2$ . It was revealed that the surface coating of phosphors with ${\mathrm{SiO}}_2$ leads to an increase in luminance intensity of PDP devices. This seems to be due to the increase of the excitation light which is transmitted into the phosphor, i.e., an effective vacuum ultraviolet absorption of the phosphor via ${\mathrm{SiO}}_2$ . The experimental results suggest that the surface coating of BAM with ${\mathrm{SiO}}_{2a}$ is a way to improve the luminance of the PDP.

In order to improve the primary color purity of the organic light emitting diode (OLED), neodymium(Nd)-containing polymethylmethacrylate (PMMA) films have been fabricated by a solvent casting method, and their optical properties have been investigated as functions of Nd content in films. The study has revealed that absorption in Nd-containing PMMA films is due to intratransition within the $4f$ shell of the ${\mathrm{Nd}}^{3+}$ ion, and that it becomes larger with an increase in the Nd concentration in films. In OLED devices with color filters, luminance from unnecessary emissive light is sufficiently reduced, resulting in a wider color gamut and higher color purity.

The effects of surface roughness on the optical properties of CdS thin film was investigated using RMS roughness measurements. CdS thin films for a window layer of the CdTe thin film solar cell were grown on ITO glass by a chemical bath deposition method with varying thiourea (CS(NH₂)₂) mole concentration. The surface roughness of the CdS thin film was measured by Atomic Force Microscopy (AFM). After obtaining the correlation factor between the RMS roughness and the difference in the diffused transmittance and the spectral transmittance by using the integrating sphere, we investigated the effect of surface morphology on the transmittance in all CdS thin films. It is obtained that the higher RMS value the specimen has, the more difference between the diffused transmittance and the spectral transmittance is measured. Moreover, the difference is evident at the long wavelength region.

Using two experimental configurations, self-assembled zinc oxide (ZnO) nanostructures including nanoplates, nanosaws, and nanobelts were synthesized by thermal chemical-vapor deposition (CVD), and their morphological properties were investigated. ZnO nanostructures grown on Au-coated Si substrates in a parallel setup revealed highly defined ZnO nanoplates and branched nanowires. ZnO nanostructures grown in a perpendicular setup using Si substrates with and without the Au catalyst exhibited vertically oriented ZnO nanosaws and randomly aligned nanobelts, respectively. In the thermal CVD method, experiment conditions such as oxygen-flow rate, growth temperature, and catalyst, and experimental configurations (i.e., parallel and perpendicular setups) were important parameters to control the morphologies of two-dimensional ZnO nanostructures showing platelike, sawlike, and beltlike shapes.

In this experiment, BaMgAl₁₀O₁₇:Eu²⁺ (BAM) phosphors were coated with thin SiO₂ film by using a radio frequency (RF) sputtering method and investigated their electro-optical properties. It was revealed that the phothluminance properties of BAM phosphors coated with 2 nm SiO₂ film were improved, when compared with non-coated ones and more thickly coated ones. The improvement may be due to the increase of an effective excitation transmitted into the BAM phosphors and the increased vacuum ultraviolet (VUV) absorption of the phosphors via SiO₂. And the decrease in luminance seen in the thickly coated phosphors may be due to the interruption of the thick SiO₂ film in the penetration of VUV. From the results of the experiment, we find that a proper coating of BAM phosphors with thin SiO₂ film is a good way for improving the luminance.