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通过熔融冷却方法制备出无掺杂和Yb~(3+)掺杂的40SiO_2·10Al_2O_3·40ZnO·10K_2CO_3·xYb_2O_3(x=0,0.3)玻璃,之后分别在680、730、780℃下对其进行热处理得到含ZnO纳米晶的微晶玻璃。通过X射线衍射、透射电子显微镜验证了不同温度热处理后ZnO纳米晶在玻璃基质中的析出以及Yb~(3+)掺杂对析晶尺寸和析晶度的影响;通过稳态和时间分辨光谱研究了Yb~(3+)掺杂玻璃及微晶玻璃的发光性能。结果表明:微晶玻璃中.ZnO纳米晶尺寸和析晶度均随热处理温度的升高以及Yb~(3+)掺杂浓度的增加而增大。紫外光激发下Yb~(3+)掺杂玻璃的红外发射是基于Yb~(3+)电荷迁移态(CTS)吸收;395 nm激发下Yb~(3+)掺杂微晶玻璃的红外发射是源于ZnO纳米晶对Yb~(3+)离子的能量传递。ZnO纳米晶的可见发光强度随着热处理温度的提高而随之减弱:而源于Yb~(3+)的~2F_(5/2)→~2F_(7/2)跃迁的红外发射的强度在730℃热处理的微晶玻璃中最强。
40SiO 2 · 10Al 2 O 3 · 40ZnO · 10K 2 CO 3 · xYb 2 O 3 (x = 0,0.3) glass doped with Yb 3+ and undoped Yb 3+ were prepared by melt-cooling method and then were respectively carried out at 680, 730 and 780 ℃ Heat treatment to obtain ZnO nanocrystalline glass-ceramics. The effects of the precipitation of ZnO nanocrystals in the glass matrix and the size and crystallinity of the crystallized ZnO nanocrystals after heat treatment at different temperatures were confirmed by X-ray diffraction and transmission electron microscopy. By means of steady-state and time-resolved spectroscopy The luminescent properties of Yb ~ (3 +) doped glass and glass-ceramic were studied. The results show that the size and crystallinity of ZnO nanocrystals in glass ceramics increase with the increase of the heat treatment temperature and the increase of Yb 3+ doping concentration. The infrared emission of Yb 3+ doped glass under UV excitation is based on the absorption of Yb 3+ charge transport state (CTS). The infrared emission of Yb 3+ doped glass ceramics under 395 nm excitation Is derived from the energy transfer of ZnO nanocrystals on Yb ~ (3 +) ions. The visible luminescence intensity of ZnO nanocrystal decreases with the increase of the heat treatment temperature. The intensity of infrared emission from ~ 2F_ (5/2) → ~ 2F_ (7/2) transition from Yb ~ (3+) 730 ℃ heat-treated glass of the strongest.