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Materials 2017, 10(9), 1000; doi:10.3390/ma10091000

The Effect of Heat Treatment on the Emission Color of P-Doped Ca2SiO4 Phosphor

Cooperative Research Facility Center, Toyohashi University of Technology, Toyohashi 441-8580, Japan
Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580, Japan
Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Author to whom correspondence should be addressed.
Received: 25 July 2017 / Revised: 21 August 2017 / Accepted: 21 August 2017 / Published: 26 August 2017
(This article belongs to the Special Issue Luminescent Materials 2017)
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In a series of (Ca2–x/2–yEuyx/2)(Si1–xPx)O4 (x = 0.06, 0.02 ≤ y ≤0.5), various color-emitting phosphors were successfully synthesized by a solid-state reaction. These phosphors were characterized by photoluminescence (PL) spectroscopy, X-ray powder diffractometry, transmission electron microscopy, and X-ray absorption fine structure spectroscopy. We evaluated the effect of heat treatment on PL properties with various annealing temperatures at 1373–1773 K for 4 h before/after reduction treatment from Eu3+ to Eu2+. In the red-emitting (Ca1.95Eu3+0.020.03)(Si0.94P0.06)O4+δ phosphor, the highest PL intensity exhibited when it was annealed at 1773 K. On the other hand, in the green-emitting (Ca1.95Eu2+0.020.03)(Si0.94P0.06)O4 phosphor, the highest PL intensity was realized when it was annealed at 1473 K and consequently treated under a reductive atmosphere. With increasing annealing temperature, the emission peak wavelength steadily decreased. Furthermore, with increasing Eu2+ content, the emission peak wavelength increased, with the color of emitting light becoming yellowish. Thus, the PL properties of the phosphors were affected by both the structural change from β to α’L, which occurred by heat treatment, and the amount of doped Eu ions. View Full-Text
Keywords: optical materials; phase transition; crystal structure; transmission electron microscopy optical materials; phase transition; crystal structure; transmission electron microscopy

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nakano, H.; Kamimoto, K.; Yokoyama, N.; Fukuda, K. The Effect of Heat Treatment on the Emission Color of P-Doped Ca2SiO4 Phosphor. Materials 2017, 10, 1000.

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