4.6 Article

Luminescent properties of a new blue long-lasting phosphor Ca2P2O7:Eu2+, Y3+

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 113, Issue 1, Pages 215-218

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2008.07.061

Keywords

Optical materials; Defects; Luminescence

Funding

  1. National Basic Research Program of China [2007CB935502]

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A new pyrophosphate long-lasting phosphor with composition of Ca1.96P2O7:0.02Eu(2+), 0.02Y(3+) is synthesized via the high-temperature solid-state reaction method. Its properties are systematically investigated utilizing XRD, photoluminescence, phosphorescence and thermoluminescence (TL) spectra. The phosphor emits blue light that is related to the characteristic emission of Eu2+ due to 5d-4f transitions. For the optimized sample, bright blue long-lasting phosphorescence (LLP) could be observed by naked eyes even 6 h after the excitation source is removed. The TL spectra show that the doping of Y3+ ions greatly enhanced intensity of 335 K peak and created new TL peak at about 373 K that is also responsible for the blue LLP. Based on our study, Y3+ ions are suggested to act as electron traps to improve the performance of the blue phosphorescence of Eu2+ such as intensity and persistent time. (C) 2008 Elsevier B.V. All rights reserved.

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