垂直梯度凝固法生长PbWO_4∶(F,Y)晶体的光学性能(英文)

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采用垂直梯度凝固法成功生长出直径为27mm、长为110mm,具有可控形状和形态的F-和Y3+共掺钨酸铅[PbWO4∶(F,Y)]晶体。通过透射光谱、荧光光谱、光产额、衰减时间等对钨酸铅晶体光学性能进行了表征。结果表明:与纯钨酸铅晶体相比,垂直梯度凝固法生长的PbWO4∶(F,Y)晶体在320~420nm的短波范围的光学透过率明显提高,光吸收边更尖锐;荧光光谱为350~580nm范围的宽峰,发射主峰为420nm;光产额达到50p.e/MeV(1 000ns内),发光衰减时间为5ns。 F - and Y3 + codoped lead tungstate [PbWO4: (F, Y)] crystals with a diameter of 27mm and a length of 110mm were successfully grown by vertical gradient solidification. The optical properties of lead tungstate crystals were characterized by transmission spectra, fluorescence spectra, light yield and decay time. The results show that the optical transmittance of PbWO 4: (F, Y) crystals grown by vertical gradient solidification in the short wavelength range of 320 ~ 420nm is obviously higher than that of the pure lead tungstate crystal, and the light absorption edge is sharper. The fluorescence spectrum is 350 ~ 580nm wide peak, the main peak emission 420nm; light yield reached 50p.e / MeV (1000ns), the luminous decay time of 5ns.
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