Abstract
High-quality Yb-doped Y3Al5O12 [yttrium–aluminum garnet YAG] crystals and Na, Ba co-doped Yb:YAG crystals with diameter of 65mm were grown from melt by the Czochralski method. The chemical of the two crystals are (Yb0.1Y0.899)3Al5O10 and (Na0.0005Ba0.0005Yb0.1Y0.899)3Al5O10. The structure, photoluminescence properties and scintillation yield were studied. The prepared samples are identified as pure garnet structure by the XRD results, indicating that the co-doping of a small amount of Na, Ba ions has no influence on the structure of the host. Thermoluminescence glow curves with the temperature showed that there were 100℃ and 260℃ thermoluminescence peaks in the two kinds of crystals, but the peak intensity of co-doping sample decreased, which suggested the number of defects decreased significantly. Light output in co-doped crystals reaches 110% comparative to Yb:YAG crystals and the sensitivity increased by 40%. This suggests that trace ions co-doping may be a possible way to reduce the crystal defect and increase the optical output.
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