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Photochromism of rare earth doped barium haloapatite

Paper ID Volume ID Publish Year Pages File Format Full-Text
26161 43937 2013 6 PDF Available
Title
Photochromism of rare earth doped barium haloapatite
Abstract

A series white-amethyst photochromic materials, Ba5(PO4)3Cl:Eu2+,R3+ (R = Y, La–Nd and Sm–Lu) are synthesized. These materials are sensitive to electromagnetic waves from short UV to X-ray. The materials change their color from white to amethyst by short UV or X-ray irradiation. The photo-colored samples can be bleached by green light irradiation or heat treatment. A model that involves ionization of the 5d electron of Eu2+ to conduction band states and subsequent trapping by a positive lattice defect is proposed for the photochromism in these compounds.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The material changes its body color upon short UV or X-ray irradiation. ► After green light irradiation or heat treatment the colored samples can be bleached. ► No degeneration was observed after many coloration ↔ bleaching processes. ► A model was proposed for the photochromism in this compound.

Keywords
Photochromism; Haloapatite; Luminescence; Concentration quenching
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 251, 1 January 2013, Pages 100–105
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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