Compositional variations in optical characteristics of Mn doped spinel crystals

Mn doped spinel (MgAl2O4) crystals have been grown by floating zone (FZ) techniques with various conditions of O2 concentrations in the growth atmosphere from 0 to 75vol%, with a starting composition of molar ratio x=MgO/(MgO+Al2O3) from 0.3 to 1.0 and/or Mn concentrations from 1.0 to 6.0at%. Optica...

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Bibliographic Details
Published in:Journal of crystal growth 2017-06, Vol.468, p.387-390
Main Authors: Katsumata, Toru, Mitomi, Hiromasa, Nagayama, Hijiri, Orihara, Yuka, Aoki, Mina, Yoshida, Ayaka, Shiratake, Kasumi, Minowa, Shunsuke, Sakuma, Takashi, Aizawa, Hiroaki, Komuro, Shuji
Format: Article
Language:English
Subjects:
A1. Solid solution
A2. Floating zone technique
Absorption spectra
Aluminum oxide
B1. Oxides
B2. Phosphors
Catalytic oxidation
Color
Crystal growth
Crystals
Growth from melt
Inorganic compounds
Luminescence
Magnesium oxide
Optical properties
Oxidation
Photoluminescence
Spinel
Studies
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Summary:Mn doped spinel (MgAl2O4) crystals have been grown by floating zone (FZ) techniques with various conditions of O2 concentrations in the growth atmosphere from 0 to 75vol%, with a starting composition of molar ratio x=MgO/(MgO+Al2O3) from 0.3 to 1.0 and/or Mn concentrations from 1.0 to 6.0at%. Optical absorption spectra and photoluminescence spectra were evaluated using crystals grown under various growth conditions. The color of the crystals is found to vary with their composition and the O2 concentration in the atmosphere. Crystals grown under a 100vol% Ar atmosphere, were a pale green color and emitted a strong green luminescence at λ=520nm. Colors of stoichiometric crystals, x=1.0, and Mg-poor crystals grown under an oxidizing atmosphere are yellow and red, respectively. Both optical absorption spectra and photoluminescence spectra of Mg-poor, x
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2016.10.062