Preparation and photoluminescence enhancement of Au nanoparticles with ultra‐broad plasmonic absorption in glasses

Abstract

The metal nanoparticles with ultra-broad localized surface plasmonic resonance (LSPR) absorption have been widely used to enhance the up conversion luminescence (UCL) of rare-earth doped nanoparticles. However, there have been no reports on the preparation of metal nanoparticles with the ultra-broad LSPR in the glasses. In this work, the gold nanoparticles with the ultra-broad LSPR were prepared for the first time in the rare-earth doped tellurite glasses by the high-temperature melting method, and the influence of ultra-broad LSPR on the UCL of Er 3+ -Yb 3+ and Er 3+ -Yb 3+ -Nd 3+ co-doped tellurite glasses was investigated upon 980 and 808 nm excitation, respectively. With the precipitation of the Au NPs, about seven and 12-fold enhancements were obtained for the green and red UCL of Er 3+ -Yb 3+ co-doped tellurite glasses excited at 980 nm, respectively, and about 5.9 and sevenfold enhancements were observed for the green and red UCL of Er 3+ -Yb 3+ -Nd 3+ co-doped tellurite glasses excited at 808 nm, respectively.The UCL mechanism related to UCL enhancement was confirmed. The results demonstrated that the enhanced excitation field and the increasing rate of radiative decay were responsible for the enhancement of UCL. K E Y W O R D S gold nanoparticles, tellurite glasses, ultra-broad surface plasmon absorption, upconversion luminescence

Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

“…TeO 2 glasses can be classified into either Te‐rich glasses with around 50 mol% TeO 2 in binary and ternary systems with application in lasers, optical fibers, amplifiers, 1‐11 or into low‐Te glasses where TeO 2 is only added in low amounts as dopant 3,12‐15 . TeO 2 glasses are promising low phonon hosts for rare‐earth elements 1,16‐23 or present luminescence properties themselves 2 . Having a broadband NIR emission and a lifetime of tens of microseconds, Te glasses of different compositions (zinc oxide, phosphate, vanadate, borate, etc) may be promising material for fabricating broadband optical fibers, amplifiers, windows, lenses or tunable lasers in visible (Vis) 3‐10,24‐27 or in infrared (IR) domain 11,24,28 …”

Excited State Absorption Upconversion Induced by Structural Defects for Photocatalysis with a Breakthrough Efficiency

“…Therefore, to disclose the working mechanism, a theoretical relationship between the emitted fluorescence intensity (I) and the pump power of the excitation light (P) was utilized here. For the reason that I is proportional to P n , [19] by drawing a logarithmic relationship curve between the integrated intensity of the emitted light and the pump power of the excitation light (LogI=nLogP), the slope n of the relationship curve was obtained, which represented the number of excitation light photons absorbed by one electron [20] . Accordingly, the as‐prepared optimum sample g‐C 3 N x −0.025 was tested for multiple sets of excitation modes, and it could be seen that the up‐conversion excitation mode of this material was a two‐photon process ( n =1.68–1.84), as shown in Figure 2d.…”

“…For the reason that I is proportional to P n , [19] by drawing a logarithmic relationship curve between the integrated intensity of the emitted light and the pump power of the excitation light (LogI = nLogP), the slope n of the relationship curve was obtained, which represented the number of excitation light photons absorbed by one electron. [20] Accordingly, the as-prepared optimum sample g-C 3 N xÀ 0.025 was tested for multiple sets of excitation modes, and it could be seen that the up-conversion excitation mode of this material was a two-photon process (n = 1.68-1.84), as shown in Figure 2d. It was known that the structural defect could act as the defect energy level in the forbidden band.…”