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利用高温固相法成功制备了Er~(3+)单掺、Er~(3+)/Yb~(3+)共掺杂Ca_(12)Al_(14)O_(32)F_2上转换发光样品。在980 nm激光激发下,Er~(3+)单掺和Er~(3+)/Yb~(3+)共掺杂样品均呈现出较强的绿光(528,549 nm)和较弱的红光(655 nm)发射,分别归因于Er~(3+)离子的~2H_(11/2),~4S_(3/2)→~4I_(15/2)和~4F_(9/2)→~4I_(15/2)能级跃迁。随着Er离子浓度的增加,单掺杂样品上转换发光强度先增大后减小,最佳掺杂浓度为0.8%。共掺杂Yb~(3+)后,Er~(3+)的发光强度明显增大。还原气氛下合成的样品上转换发光强度增大约两倍,可能和笼中阴离子基团变化有关。发光强度和激发光功率的关系表明所得上转换发射为双光子吸收过程,借助Er~(3+)-Yb~(3+)体系能级结构详细讨论了上转换发射的跃迁机制。 相似文献
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采用低温燃烧法制备出Li+,Er3+共掺杂Gd2O3纳米粉体,将粉体压片成型后在1500℃真空条件下烧结10 h成功制备出Li+,Er3+共掺杂Gd2O3半透明陶瓷。对粉体和半透明陶瓷样品的晶体结构、形貌、显微结构和上转换发光特性等用XRD,TEM,SEM,FL等手段进行了表征和研究。结果表明:Li+和Er3+均匀地溶解于Gd2O3晶格之中。粉体颗粒近似球形,粒径约20~30 nm。烧结后半透明陶瓷致密度高,未见气孔存在,透光率高;在980 nm LD激发下有两个峰值波长分别为561 nm(绿光)和658 nm(红光)上转换发光带,分别对应4S3/2/2H11/2→4I15/2和4F9/2→4I15/2跃迁;Li+的掺杂抑制了Gd2O3由立方到单斜的相变,且使陶瓷样品中Er3+的上转换发光强度显著增强,红绿光之比大大提高。 相似文献
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Intense 2.7-μm emissions are obtained from Er3+/Nd3+ co-doped tellurite glass samples under the 808-nm laser diode excitation.According to the absorption spectra,Judd-Ofelt parameters and radiative transition probabilities are calculated and analyzed using the Judd-Ofelt theory.The spectroscopic properties and energy transfer mechanism between Er3+ and Nd3+ are analyzed.The effects of OH- content on the spectroscopic properties of Er3+/Nd3+ co-doped samples are discussed.The obtained results indicate that Er3+/Nd3+ co-doped tellurite glass can significantly develop optical properties of 2.7-μm emission,if OH- exoups can be effectivelv eliminated. 相似文献