George Muller, J. and Karthikeyan, J. and Murugan, P. and Lakshminarasimhan, N. (2014) Influence of Structural Polymorphs on Tunable White Light Generation from Orange-Red-Emitting BiPO4:Eu3+ Phosphor by Surface Modification. Journal of Physical Chemistry C, 118. pp. 19308-19314. ISSN 1932-7447

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We report the surface modification of orange-red-emitting hexagonal and monoclinic polymorphs of BiPO4:Eu3+ with oleic acid (OA) for white light generation. The surface-modified hexagonal phase emits white light under near-UV excitation (350−395 nm) through the mixing of broad blue emission from OA and orange-red emission from Eu3+, whereas the same was not observed with the monoclinic phase. The variation in OA emission upon anchoring over the surface of hexagonal BiPO4:Eu3+ resulted in white light generation. Such variation in the interaction of OA with surfaces of BiPO4 polymorphs and surface induced midgap states was established through first-principles calculations that revealed the strong interaction of OA with hexagonal phase. The deduced density of states corroborates the experimental findings on the polymorph-dependent PL properties of OA-modified hexagonal and monoclinic BiPO4:Eu3+

Item Type: Article
Uncontrolled Keywords: Orange, red emitter; Phosphors
Subjects: Electrochemical Materials Science
Depositing User: Dr. N Meyyappan
Date Deposited: 26 Dec 2014 08:19
Last Modified: 26 Dec 2014 08:19

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