【摘要】 本文报导了掺 Nd、Cr、(Nd,Cr)、(Ca,Zr)钆镓石榴石单晶的色心研究,主要测量晶体色心吸收谱,它们有共同的吸收峰,约在420nm处。色心晶体荧光谱线的测量说明,色心的吸收对荧光发射有能量转移的作用。本文还讨论了双掺(Nd,Cr)比单掺Nd或Cr的晶体色心浓度小的现象,认为这是由于晶格畸变小之故。 实验结果说明,经紫外线、X射线或γ射线辐照的掺质GGG单晶,所产生的色心属同一类型。γ射线辐照后的GGG单晶在室温下经过三个月时间存放没有退色现象,而经强光照射和热处理却很易退色。更多还原

【Abstract】 Investigation of color centers in GGG crystals doped with Nd, Cr, (Nd, Cr), (Ca,Zr) ispresented in the paper.Absorption spectra of color centers having a common peak at about420 nm have been observed.Measurement of the fluorescence spectra of these crystals showsthat color center absorption has an effect of energy transfer.The fact that double-doping(Nd,Cr) crystal has a smaller color center concentration when compared with single-doping(Nd or Cr) crystal is due to smaller lattice distortion of the former.Experimental resultsshow that the color centers produced by ultraviolet radiation,X-radiation or γ-radiationare of the same type. No fading exists in γ-irradiated crystals placing at room temperaturefor 3 months, but under strong illumination or heat treatment the crystals can be bleachedeasily.更多还原