Hyoung-bin Park

Effect of dual coplanar electrodes on Mercury-free flat fluorescent lamps for liquid crystal display

The effects of dual coplanar electrodes on a Hg-free flat fluorescent lamp were studied. For a dual coplanar lamp, brightness and efficacy were improved by 80% compared to a conventional coplanar lamp. The improvement is regarded as the result of reduced diffusion loss and the effective usage of the discharge volume in the dual coplanar lamps. An efficacy of 35.9 lm/w (14900 cd/m/sup 2/) was achieved for 250 torr of a Xe(30%)/Ne(70%) gas mixture, by a 20-kHz ac pulse driving.

OPTICAL AND STRUCTURAL PROPERTIES OF ZNCDSE/ZNSSE/ZNMGSSE SEPARATE CONFINEMENT HETEROSTRUCTURES

We have grown ZnCdSe/ZnSSe/ZnMgSSe separate confinement heterostructures by molecular‐beam epitaxy. Strain on the ZnSSe layer is calculated from x‐ray and photoluminescence data. The temperature dependence of band‐gap energy and the photoluminescence intensity in the Cl‐doped ZnCdSe active layers is compared with that of undoped ones.

Effect of helium addition on discharge characteristics in a flat fluorescent lamp

The discharge characteristics of a multielectrode dual coplanar in a mercury-free flat fluorescent lamp were investigated using brightness-efficiency measurement and the infrared (IR) spectrum and intensified charge coupled device (ICCD) characteristics. The level of brightness was above 14900cd∕m2 under the conditions of neon-–50% xenon–8% He gas composition, 150Torr pressure, and 20kHz alternating current pulse. The ICCD results revealed a faster and wider discharge with a Ne–50% Xe–8% He gas composition. The effect of adding helium (He) to Ne–50% Xe revealed a faster peak emission, as confirmed by ICCD images. From the gated IR emission spectrum, the intensity ratio of I823nm∕I828nm was ∼8% higher with Ne–50% Xe–8% He than with Ne–50% Xe under the same pressure and applied voltage conditions.

Nanoplasmon-Enhanced Light Emitter for AC Plasma Display Panels With Large Scalability

We demonstrate for the first time a large-scale ac plasma display panel enhanced by localized surface plasmon (LSP) resonance owing to Ag nanoparticles. In order to generate plasmon resonance fitted to the blue-emitting phosphor, we deposited Ag nanoparticles on the phosphor layer by a spray method using large-scale fabrication technology. Localized surface plasmon resonance by Ag nanoparticles was strongly induced at the blue-emission regime. The measurement of the optical and electrical properties revealed that the enhanced emission from the phosphor was reflected in luminous efficacy enhanced by an average of 17.8% in manufactured test display panels. The improved luminous efficiency originated from the resonant coupling between the LSPs of the Ag nanoparticles and the electric-dipole transition of europium ions responsible for blue emission.

8.2: New Electrode Structure to Improve Discharge Characteristics in AC PDPs

A new structure including igniter electrode is proposed to achieve a low sustaining voltage and high luminous efficacy. By measuring minimum sustaining voltage(Vsm), discharge current(Ion), displacement current(Ioff) and brightness of the light from a 6-inch AC PDP, performances of the conventional structure and the igniter structure are compared. When compared with the conventional structure, the igniter structure showed 10% Vsm improvement at the Ne-Xe(10%) gas mixture of 600 mbar. Therefore, we could apply the higher partial pressure of Ne-Xe(12%) to the igniter structure, which results in 42% luminous efficacy improvement at the similar sustaining voltage range.

25.3: Luminous Efficacy Dependence of Kr2* Excimer ACPDP on Sustain Driving Conditions

Sustain driving conditions for Kr2* excimer ACPDP are investigated with real 6-inch panels. At the optimized driving with 5 kHz, the PDP with a mixture of Kr: Ne = 50:50 (%) shows the efficacy of 1.6 lm/W, which is over 2 times higher than that of the same PDP panel with a conventional mixture (Xe: Ne = 4:96 (%), 0.7 lm/W).

14.4: Plasma Display Panel with Ridged Dielectric Layer between Sustaining Electrodes

This article presents a front panel structure for an alternating current plasma display panel (AC PDP) based on a ridged transparent dielectric layer between the sustaining electrodes. Compared to a conventional AC PDP, the suggested structure can reduce a firing voltage and sustaining voltage due to a strong electric field between the sustaining electrodes. First experiments were conducted to see the effect of ridged dielectric structure in the short electrode gap of 110 μm with various Xe contents from 10% to 50% at a gas pressure of 450 Torr, and the results confirmed that the ridged dielectric structure reduced the firing and sustaining voltages by about 74 and 79 V at 10% Xe content compared to a conventional structure with 10% Xe content, respectively. Also, the proposed structure improved the luminous efficacy and luminance by about 50.9% and 33%, respectively, with 50% Xe content when compared to a conventional structure with 10% Xe content at a similar driving voltage. Second, performances of the conventional structure and the ridged dielectric structure with the electrode gap of 140 μm were compared. Experimental results confirmed that the box shaped ridged dielectric structure could be driven at a lower voltage than conventional AC-PDPs with the same Xe content. Also, the luminous efficacy of box shaped ridged dielectric structure was higher than those of conventional structures.

P‐176L: Late‐News Poster: Improvement of Luminous Characteristics of AC‐PDP with Long Discharge Path Using Ridged Front Dielectric Layer

The luminous characteristics of the LDP (Long Discharge Path: 500 μm)-PDP with a ridged front dielectric layer were investigated, where the ridged front dielectric layer means that the dielectric layer between the sustain electrodes was etched out completely using the Sand-blasting process. In the LDP-PDP of which the main discharge is produced along the address electrode, the higher luminance was obtained due to the improved visible transmittance in the ridged front dielectric layer, thereby contributing to improving the luminous efficiency of a LDP-PDP with a ridged front dielectric layer. As a result, it was observed that the luminance of the LDP-PDP with a ridged front dielectric layer increased about 16∼17 %, when compared to that of the LDP-PDP cell with a conventional dielectric layer, whereas the corresponding luminous efficiency was improved about 12∼14 % due to the slight increase in the discharge current.