Ag@SiO_(2)纳米核壳结构对铒碲发光玻璃的发光增强机制

Luminescence enhancement mechanism of Er^(3+) ions by Ag@SiO_(2) core-shell nanostructure in tellurite glass

本研究首次把预先制备好的Ag@SiO_(2)纳米核壳结构成功地引进到碲化物发光玻璃70TeO_(2)-25ZnO-5La_(2)O_(3)-0.5Er_(2)O_(3)体内,发现(A)Ag(1.6×10^(−6)mol/L)@SiO_(2)(40 nm)@Er^(3+)(0.5%):铒碲发光玻璃相对于样品(B)Er^(3+)(0.5%):铒碲发光玻璃的可见光与红外光的激发光谱强度的最大增强依次为149.0%与161.5%,可见光与红外光的发光光谱强度则依次最大增强了155.2%与151.6%,同时还发现样品(A)相对于样品(B)的寿命显著变长。由于Ag@SiO_(2)的表面等离子体吸收峰恰好位于546.0 nm,它与铒离子的发光峰546.0 nm完全共振,因此,Ag@SiO_(2)对铒碲发光玻璃的发光共振增强作用显著。由于银的纳米核壳结构与玻璃的制作具有分步实现的优点,它既能成功控制Ag@SiO_(2)的尺寸,而且在Ag@SiO_(2)@Er:铒碲发光玻璃的制作过程中还具有可操作性强的优点,同时价格也更加便宜。在保证银不被氧化的前提下,还可控制稀土离子发光中心与银的表面等离子体之间的距离,因此能够成功地减少背向能量反传递。上述优点促成了Ag@SiO_(2)纳米核壳结构表面等离子体有效加强了Ag@SiO_(2)@Er^(3+):铒碲发光玻璃的常规光致发光强度。

In this paper,we introduce a prefabricabed Ag@SiO_(2)nanostructure directly into tellurite luminescence glass composed of 70TeO_(2)-25ZnO-5La_(2)O_(3)-0.5Er_(2)O_(3).We find that the maximum enhancement of visible and infrared excitation spectra intensity of(A)Ag(1.6×10^(−6)mol/L)@SiO_(2)(40 nm)@Er^(3+)(0.5%):tellurite glass relative to(B)Er^(3+)(0.5%):tellurite glass is about 149.0%and 161.5%,respectively.Their maximum enhancement of visible and infrared luminescence spectra intensity is 155.2%and 151.6%,respectively.We also find that sample(A)has a larger lifespan compared to sample(B).Because the surface plasmon absorption peak of Ag@SiO_(2)is located at 546.0 nm,it completely resonates with the luminescence peak of erbium ions which are also at 546.0 nm.Therefore,the resonance enhancement action of Ag@SiO_(2)on the luminescence of erbium-doped tellurite luminescence glass is significant.Thanks to the advantages of the step-by-step realization of the silver nano core-shell structure and the production of glass,it can successfully and smoothly control the size of Ag@SiO_(2).It also has the advantage of strong operability in the manufacturing process of Ag@SiO_(2)@Er:telluride luminescence glass.Its costs are also minor.Moreover,it can not only ensure that the silver is not oxidized,but it can also successfully control the distance between the rare earth ion luminescence center and the silver surface plasma.It can also successfully reduce the back energy transfer,which allows the silver surface plasma to more effectively enhance the intensity of photo-luminescence.