Abstract
A new phosphor Y(4)Al(2)O(9):Eu(3+) (YAM:Eu(3+)) emitting intense monochromatic red at 612 nm under vacuum ultraviolet (VUV) and ultraviolet (UV) excitations has been developed for application in next generation plasma display panels (PDPs). The developed phosphor has better luminescence efficiency, colour purity and shorter decay time than commercial (Y,Gd)BO(3):Eu(3+) red emitting PDP phosphor. High color purity (x = 0.67, y = 0.32) under VUV excitation with short decay time (1.03 msec) and excellent stability against degradation during PDP panel preparation suggest that YAM:Eu(3+) is a potential candidate for present and future PDPs. Surface coating by SiO(2) further improved phosphor characteristics.
Highlights
Plasma display panels (PDPs) dominate the segment of the generation flat panel displays which uses vacuum ultraviolet (VUV) excitation of Red, Green and Blue (RGB) phosphors for image display
For full coloured large area flat display, PDP is a very promising technique due to the progress made in technology by way of improvements in cost, resolution, lifetime, power consumption, high performance and luminescence efficiency which results in the reductions of thickness and weight [1,2] Motivated by the advances in PDP technique, the demand of highly efficient vacuum ultraviolet (VUV) phosphors has increased tremendously in the past decade [3]
In PDP’s plasma resonance, vacuum ultraviolet (VUV) radiation lines of Xe atoms at 147 nm and a molecular excimer Xe2 at 172 nm are used for excitation of phosphors to emit visible luminescence in red, green and blue
Summary
Plasma display panels (PDPs) dominate the segment of the generation flat panel displays which uses VUV excitation of Red, Green and Blue (RGB) phosphors for image display. Blue and green phosphors have shown degradation in luminescence intensity due to the thermal treatment of PDP manufacturing process and this remains a major problem for PDP phosphors [4,5,6,7] Another challenge in PDP technology today is to improve the purity of red phosphor so as to obtain monochromatic red emission with good color coordinates [8,9]. Decay time of YGB:Eu3+ phosphor is long (12 msec) which makes this phosphor unsuitable for generation PDP sets It is, necessary to develop highly efficient, baking resistant, high color purity red-emitting phosphor with shorter decay time. To the best of our knowledge, we report for the first time Eu3+ doped YAM that is highly efficient, degradation controlled, pure red-emitting phosphor with additional feature of short decay time suitable for advanced PDPs
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