Nakano Hiromi, Kamimoto Konatsu, Yokoyama Nobuyuki, Fukuda Koichiro
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.
Materials (Basel). 2017 Aug 26;10(9):1000. doi: 10.3390/ma10091000.
In a series of (CaEu□)(SiP)O₄ ( = 0.06, 0.02 ≤ ≤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 Eu to Eu. In the red-emitting (CaEu□)(SiP)O phosphor, the highest PL intensity exhibited when it was annealed at 1773 K. On the other hand, in the green-emitting (CaEu□)(SiP)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 Eu 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', which occurred by heat treatment, and the amount of doped Eu ions.
在一系列（CaEu□）（SiP）O₄（ = 0.06，0.02 ≤ ≤0.5）中，通过固态反应成功合成了各种发光颜色的磷光体。这些磷光体通过光致发光（PL）光谱、X射线粉末衍射、透射电子显微镜和X射线吸收精细结构光谱进行表征。在从Eu还原为Eu之前/之后，我们评估了在1373 - 1773 K下不同退火温度4小时的热处理对PL性能的影响。在发红光的（CaEu□）（SiP）O磷光体中，在1773 K退火时表现出最高的PL强度。另一方面，在发绿光的（CaEu□）（SiP）O₄磷光体中，在1473 K退火并随后在还原气氛下处理时实现了最高的PL强度。随着退火温度的升高，发射峰波长稳步下降。此外，随着Eu含量的增加，发射峰波长增加，发光颜色变黄。因此，磷光体的PL性能受到热处理引起的从β到α'的结构变化以及掺杂Eu离子量的影响。
