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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

1
Cooperative Research Facility Center, Toyohashi University of Technology, Toyohashi 441-8580, Japan
2
Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580, Japan
3
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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Abstract

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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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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