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通过坩埚下降法成功生长出直径为1inch、等径部分长度达到7cm的掺0.2mol%Dy~(3+)的TeO_2晶体,该晶体主体部分无色透明、无裂纹、无明显包裹物,但后半部有裂痕,且有灰白色析出物,在可见光波段透过率约为70%。测试了TeO_2:Dy晶体的荧光光谱,观察到了Dy~(3+)离子外层4f电子能级跃迁产生的特征激发峰和吸收峰,并给出了简单的能级跃迁发光机理图。结果表明,它在363nm近紫外光激发下,能够发射中性白光,在348nm和387nm近紫外光、453nm蓝光激发下,能够发射稳定的暖白光,从而实现通过改变激发光波长调节该晶体发射不同的白光。因此,TeO_2:Dy是一种能够实现可调谐白光发射的荧光单晶候选材料。
The crystal of TeO 2 doped with 0.2 mol% Dy ~ (3+) with a diameter of 1 inch and an equiaxed part of 7 cm in length was successfully grown by the crucible descent method. The main part of the crystal was colorless, transparent and crack-free without obvious inclusion, Half of the cracks, and there is gray precipitate, in the visible band transmittance of about 70%. The fluorescence spectra of TeO_2: Dy crystal were tested. The characteristic excitation and absorption peaks of the 4f electron level transition of the outer layer of Dy ~ (3 +) ion were observed. The results show that it can emit neutral white light under the excitation of near-ultraviolet light at 363nm and stable warm white light under the excitation of 348nm and 387nm near-ultraviolet light and blue light at 453nm, so as to realize the different emission by adjusting the excitation light wavelength White light. Therefore, TeO 2: Dy is a fluorescent single crystal candidate material that can achieve tunable white light emission.