Yb^(3+)/Er^(3+)掺杂氟氧化物微晶玻璃的制备与发光性能

Preparation and luminescence properties of Yb^(3+)/Er^(3+)-codoped oxyfluoride glass ceramics

采用高温熔融法制备了Yb3+/Er3+掺杂的氟氧化物发光微晶玻璃,确定了最佳熔化温度(1 100℃)和退火温度(440℃,480℃)。测定得到基质玻璃的透过率为85%,掺入稀土后,透过率有所下降,并出现了稀土离子的特征吸收峰。980 nm半导体激光器(LD)激发下样品的上转换发射光谱存在4个明显的发射峰,分别为410,532,546和656 nm,对应于2H9/2→4I15/2,2H11/2→4I15/2,4S3/2→4I15/2和4F9/2→4I15/2跃迁。研究了不同Yb3+/Er3+(摩尔分数)和Er3+浓度对上转换发光强度的影响,当Yb3+∶Er3+=4∶1、Er3+摩尔分数为1.5%时,上转换发光强度达到最高。根据发光强度与泵浦功率之间的关系,确定了上转换发射均为双光子过程。讨论了Yb3+,Er3+离子间的能量传递,建立了上转换发光机制。

Yb3＋/Er3＋-codoped oxyfluoride glass ceramics were prepared by the high temperature melting method,and a suitable fusing temperature（1 100 ℃） and annealing temperatures（440 ℃,480 ℃） of the rare-earth-doped glass ceramics were determined.Experiments show that the transmittance of the host glass is 85%,but the transmittance drops evidently and there are characteristic absorption peaks of rare-earth ions when the host glass is doped with Yb3＋/Er3＋ ions.With 980 nm laser diode（LD） excitation,the purple emission peak at 410 nm,green emission peak at 532 nm and 546 nm and red emission peak at 656 nm corresponding to 2H9/2→4I15/2,2H11/2→4I15/2,4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3＋,respectively,were simultaneously observed at room temperature.The effects of Yb3＋/Er3＋ in mol concentration ratio and different concentrations of Er3＋ ion on the intensity of up-conversion luminescence was studied.The experiments show that the up-conversion luminescence intensity is up to maximum value when the concentration ratio of Yb3＋/Er3＋ is 4∶ 1 and concentration of Er3＋ ion is 1.5% in mol concentration.According to the relationship between the pump power and luminous intensity,the four up-conversion luminescences are verified to be the two-photon process.Energy transfer was used in discussing the up-conversion mechanism and the pertinent up-conversion mechanism was proposed.