Blue shift in band gap and photoluminescence of pulsed laser deposited SrS:Ce/quartz thin film nanophosphors

Title
Blue shift in band gap and photoluminescence of pulsed laser deposited SrS:Ce/quartz thin film nanophosphors
Authors
Ankush Vij가우탐Ravi KumarAmit K. ChawlaRamesh ChandraNafa Singh채근화
Keywords
SrS:Ce; Thin film nanophosphors; PLD; Photoluminescence
Issue Date
2012-06
Publisher
Journal of alloys and compounds
Citation
VOL 527, 1-4
Abstract
We report on the synthesis of single phase SrS:Ce/quartz thin film nanophosphors at a substrate temperature of 400 ◦C using pulsed laser deposition. The AFM and FESEM micrographs reveal the island structure with granular growth of nanophosphors. The average crystallite size (~13 nm using Williamson–Hall plot), the average grain size (~40 nm using AFM) and the blue shift in band gap confirm the nanostructure formation. Interestingly, the photoluminescence emission corresponding to 5d−4f transitions in Ce3+ ion under the cubic crystal field of SrS also exhibits a significant blue shift, which can be explained using phenomenological crystal field model modified by covalency factor.
URI
http://pubs.kist.re.kr/handle/201004/42196
ISSN
09258388
Appears in Collections:
KIST Publication > Article
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