Abstract
<p>Phosphors the ceramic materials should able to work in tough environment surrounded and bombarded by high energy Vacuum Ultra Violet (VUV), UV or electron beam radiations in any discharge tube. The plasma display panel (PDP) is increasingly gaining attention over conventional cathode ray tube (CRT)- based TVs as a medium of large format (60+”) television (TV), particularly high definition TVs (HDTVs). Improvements have been made not only in size but also in other areas such as resolution, luminescence efficiency, brightness, contrast ratio, power consumption, and cost reduction. The formation of a phosphor host and doping process by solid solution is critical and is highly dependent on the reaction temperature and conditions. Since the purity of starting chemicals is very important to the synthesis of phosphors, the starting chemicals are typically 99.9%, 99.999% in purity. Required amounts of starting ingredients are mixed in the presence of an appropriate flux (if necessary) and fired at high temperatures (1200 °C) in air or in a controlled atmosphere (N<sub>2</sub>, C, CO, or N<sub>2</sub> with 2-5% of H<sub>2</sub>). The present paper reports the synthesis and luminescence characteristics of different ceramic materials (phosphors) for display applications.</p>
Highlights
Phosphors the ceramic materials should able to work in tough environment surrounded and bombarded by high energy Vacuum Ultra Violet (VUV), UV or electron beam radiations in any discharge tube
Since the purity of starting chemicals is very important to the synthesis of phosphors, the starting chemicals are typically 99.9%, 99.999% in purity
The present paper reports the synthesis and luminescence characteristics of different ceramic materials for display applications
Summary
The tough materials in the ceramic form are the inorganic silicate phosphors; zinc silicate doped with divalent manganese ions is well known for its high luminescence efficiency coupled with excellent color purity and application for lamps and cathode ray tubes as a green phosphor. Last past few years, greater attention has been paid to the study of luminescence properties of rare earth ions (Mn2+, Ce3+, Tb3+ and Eu3+ etc..) doped zinc silicate phosphors in powder and thin film forms with a view to examining their application for flat panel display devices for. ZnO, SiO2 and MnCO3 were mixed and ground thoroughly using ball mill prior to this all the materials are weighed as per the required quantities. This mixture was fired initially at 1000 °C. for 2 hrs and fired again for 1200 °C for 4 hours in air. The photoluminescence spectra were recorded at room temperature using Spectrofluorophotometer (SHIMADZU RF5301 PC), XRD using synchrotron beam line-12 and SEM (XL 30 CP Philips) studies are done on the prepared samples
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