Micro-defects and optical properties of YAG:Ce crystals prepared by optical floating zone method

Micro-defects and optical properties of YAG:Ce crystals prepared by optical floating zone method
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光学浮区法制备YAG:Ce晶体的微观缺陷及光学性能

DOI:
10.1142/s0217979217440684
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发表时间:
2017-07
期刊:
International Journal of Modern Physics B, (2017) (accepted, in press)
影响因子:
--
通讯作者:
Yuyang Huang
Yuyang Huang
中科院分区:
其他
文献类型:
--
作者:
Yan Meng;Xiuqing Cao;Dingkan Xiong;Yuyang Huang

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分别采用固相反应法和光学浮区法制备了Y3Al5O12(YAG):Ce陶瓷棒和单晶。 XRD结果表明,YAG:Ce陶瓷中的物相为YAG相和YAlO3(YAP)相的混合物。 YAG:Ce单晶中只有一个YAG相。 YAG:Ce晶体的平均正电子寿命随着Ce含量的增加而降低,并在1 at.% Ce时达到最小值,然后随着Ce含量的增加而增加。 YAG:Ce晶体的平均正电子寿命高于相同化学成分的YAG:Ce陶瓷。 YAG:Ce晶体的紫外-可见吸收光谱表明,YAG:Ce晶体在550 nm~800 nm波长范围内的透过率高于90%。 YAG:Ce晶体的光致发光光谱显示出位于525-529 nm范围内的宽发光发射峰。 Ce 含量为 1 at.% 的 YAG:Ce 晶体具有相对较高的发光强度。随着Ce含量的进一步增加,由于荧光猝灭效应,发光强度降低。
The Y3Al5O12 (YAG):Ce ceramic rods and single crystals were prepared by solid state reaction and optical floating zone method, respectively. The XRD results showed that the phases in the YAG:Ce ceramics are mixture of YAG phase and YAlO3 (YAP) phase. There is only a single YAG phase in the single crystals of YAG:Ce. The mean positron lifetime of the YAG:Ce crystal decreases with increasing Ce content, and reaches minimum at 1 at.% Ce, then increases with Ce content. The mean positron lifetime of the YAG:Ce crystal is higher than that of YAG:Ce ceramic with the same chemical composition. The UV–visible absorption spectra of the YAG:Ce crystals indicated that the transmittances of the YAG:Ce crystals are higher than 90% in the wavelength range from 550 nm to 800 nm. The photoluminescence spectra of the YAG:Ce crystals showed wide luminescence emission peaks located in the range of 525–529 nm. A relatively high luminescence intensity is found in the YAG:Ce crystal with 1 at.% Ce. With further increase of Ce content, the luminescence decreases due to the fluorescence quenching effect.
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