发光CaAl2Si2O8-Eu2+20Si12O48N4-Eu3+微晶玻璃陶瓷.doc


Luminescent glass-ceramics containing CaAl2Si2O8: Eu2+
and Y20Si12O48N4: Eu3+ crystallites#
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Hamed Karimi, Yuting Zhang, Shuo Cui, Ronghua Ma, Gu Li, Qiannan Wang, Jiajia
Zhao, Xvsheng Qiao, Xianping Fan**
(State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China)
Abstract: Novel oxynitride glass-ceramics with tremendously improved quantum yield and adjustable
color coordinates were prepared with the conventional melt-and-quench method followed by
subsequent annealing heat treatment. X-ray diffraction (XRD) and Transmission Electron Microscopy
(TEM) images revealed CaAl2Si2O8 and Y20N4Si12O48 crystalline phases were homogenously
precipitated in the glass-ceramics. The optical absorption and photoluminescence (PL) spectra
measurements showed that a large portion of Eu3+ were converted into Eu2+ which substituted Ca2+ in
CaAl2Si2O8 crystals during the heat treatment. Eu2+ and Eu3+ were found to be preferentially
incorporated with CaAl2Si2O8 and Y20N4Si12O48 crystalline phases, respectively. The total emission
intensity including the emission of both Eu2+ and Eu3+ ions were enhanced with increasing the
annealing temperature, owing to the conversion of Eu3+ to Eu2+ and the lower nonradiative rate of Eu3+
in the crystalline phase pared to the glass matrix. The quantum yie