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Understanding and arresting degradation in highly efficient blue emitting BaMgAl10O17:Eu2+ phosphor-A longstanding technological problem

IR@NPL: CSIR-National Physical Laboratory, New Delhi

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Title Understanding and arresting degradation in highly efficient blue emitting BaMgAl10O17:Eu2+ phosphor-A longstanding technological problem
 
Creator Shanker, Ravi
Khan, A. F.
Kumar, Raj
Chander, H.
Shanker, V.
Chawla, Santa
 
Subject Optics
 
Description 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.
 
Publisher Elsevier
 
Date 2013-11
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://npl.csircentral.net/2985/1/Understanding%20and%20arresting.pdf
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
 
Relation http://npl.csircentral.net/2985/