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Single Crystal Growth and Crystal Structure Analysis of Novel Orange-Red Emission Pure Nitride CaAl2Si4N8:Eu2+ Phosphor.

ABSTRACT: Single crystal of novel orange-red emission CaAl2Si4N8: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 CaAl2Si4N8:Eu2+ single crystal was verified to be an ?-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)N4 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 °C, the emission intensity of the CaAl2Si4N8:Eu2+ phosphor decreased to 88% of the initial value at 25 °C.

SUBMITTER: Hasegawa S 

PROVIDER: S-EPMC6648754 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Single Crystal Growth and Crystal Structure Analysis of Novel Orange-Red Emission Pure Nitride CaAl<sub>2</sub>Si<sub>4</sub>N<sub>8</sub>:Eu<sup>2+</sup> Phosphor.

Hasegawa Shota S   Hasegawa Takuya T   Kim Sun Woog SW   Yamanashi Ryota R   Uematsu Kazuyoshi K   Toda Kenji K   Sato Mineo M  

ACS omega 20190607 6

Single crystal of novel orange-red emission CaAl<sub>2</sub>Si<sub>4</sub>N<sub>8</sub>:Eu<sup>2+</sup> 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 CaAl<sub>2</sub>Si<sub>4</sub>N<sub>8</sub>:Eu<sup>2+</sup> single crystal was verified to be an α-Si<sub>3</sub>N<sub>4</sub>-type trigonal structure (space group <i>P</i>31<i>c</i>) with <i>a</i>  ...[more]

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