Shanker, Ravi and Khan, A. F. and Kumar, Raj and Chander, H. and Shanker, V. and Chawla, Santa (2013) Understanding and arresting degradation in highly efficient blue emitting BaMgAl10O17:Eu2+ phosphor-A longstanding technological problem. Journal of Luminescence , 143. pp. 173-180. ISSN 0022-2313

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Abstract

Blue emitting BaMgAl10O17:Eu2+ (BAM) phosphor is indispensable for Plasma Display panel and lighting because of high luminescence efficiency. However, thermal degradation (annealing in air at 500-600 degrees C) of BAM (upto similar to 30%) remains an intriguing problem for display industry worldwide. In the present study, a systematic approach is pursued to develop highly efficient BAM phosphor that exhibits least degradation, understand the role of Eu2+ site occupancy in such BAM phosphor and encapsulate individual phosphor grains with a shell of silica nanoparticles. The approaches lead to highly efficient BAM:Eu2+ phosphor that showed no degradation against thermal baking (annealing at 500 degrees C in air) for both UV and VUV radiation under UV and VUV excitation. An optimum solid state chemical route including precursor phases, dopant concentration, and thermal regimes has been evolved to develop BAM. Emission from Eu2+ occupying three different sites is identified with energetically stable anti Beevers Ross as the dominant contributor. Coating by nano sized amorphous silica sol with subsequent sintering lead to uniform silica shell. This nano silica layer also helps to enhance the luminescence from phosphor grains.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Optics
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	14 Mar 2019 07:23
Last Modified:	14 Mar 2019 07:23
URI:	http://npl.csircentral.net/id/eprint/2985

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