Journal
ACS OMEGA
Volume 4, Issue 6, Pages 9939-9945Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b00606
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Funding
- JSPS [JP17H03386, JP17H03124]
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Single crystal of novel orange-red emission CaAl2SO8:Eu2+ phosphor was grown by our original vapor phase technique, and the precise crystal structure was investigated for the first time by single crystal X-ray diffraction analysis. The crystal structure of CaAl2SO8:Eu2+ single crystal was verified to be an alpha-Si3N4-type trigonal structure (space group P31c) with a = 0.79525(9) nm, c = 0.57712(8) nm, and z = 2. The Ca atoms were coordinated to seven nitrogen atoms and located in the three-dimensional framework formed by (Al, Si)N-4 tetrahedra. The single-crystal CaAl2Si4N8:Eu2+ phosphors exhibited a broad reddish-yellow emission with a peak at 600 nm under near-UV and blue light excitation. When increasing the temperature up to 150 degrees C, the emission intensity of the CaAl2Si4N8:Eu2+ phosphor decreased to 88% of the initial value at 25 degrees C.
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