Up-conversion luminescence, temperature sensing properties and laser-induced heating effect of Er3+/Yb3+ co-doped YNbO4 phosphors under 1550 nm excitation

Abstract

YNbO4 phosphors with various Er3+ and Yb3+ concentrations were synthesized via a traditional high-temperature solid-state reaction method. Their crystal structure was investigated by means of X-ray diffraction (XRD) and Rietveld refinements, and it was confirmed that the obtained samples exist in monoclinic phase. The Er3+ and Yb3+ concentration-dependent up-conversion (UC) luminescence was studied under 1550 nm excitation. By inspecting the dependence of UC intensity on the laser working current, it was found that four-photon and three-photon population processes were co-existent for generating the green UC emissions in the samples with higher Yb3+ concentrations. In addition, it was observed that the temperature sensing properties of YNbO4: Er3+/Yb3+ phosphors were sensitive to both Er3+ and Yb3+ doping concentrations. Furthermore, based on the obtained temperature response of the UC luminescence phosphors, 1550 nm laser-irradiation-induced thermal effect was studied, and it was discovered that the sample temperature was very sensitive to the doping concentrations of Er3+ and Yb3+ and the excitation power.

Bi3+ Effects on Down-/up-conversion Luminescence, Temperature Sensing and Optical Transition Properties in Bi3+/Er3+ Co-doped YNbO4  Phosphors

“…4(b), it can be seen that the excitation spectrum of Er 3+ single-doped YNbO4 sample monitored at 555 nm (corresponding to the 4 S3/2→ 4 I15/2 transition of Er 3+ ions) consists of two parts. One is a broad excitation band centered at around 265 nm, which can be assigned to the absorption of NbO4 4- [7].…”

“…Moreover, these two green-emitting energy levels 2 H11/2, 4 S3/2 are thermally coupled energy levels, whose populations fulfill Boltzmann's distribution law. The fluorescence intensity ratio (FIR) of the two green emissions depends on the sample temperature, Er 3+ ion has been extensively studied as an optical temperature sensing unit [6][7][8].…”

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

“…Gaft et al (2005) report Yb 3+ excitation to be strongly dependent on Nd, but NAA results from Donovan et al (2002) do not indicate any Nd contamination. Other potential candidates for energy transfer processes to Yb 3+ are Ho (e.g., Wei et al, 2011;Gavrilović et al, 2015;Kang et al, 2019) (NAA mass fraction: 0.2 ± 0.4 × 10 −3 ), Er (e.g., He et al, 2017;Wang et al, 2018;Kang https://doi.org/10.5194/essd-2020-296 Open Access…”

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

“…In the previously reported studies about photoluminescence properties, much larger and brighter particles (μm-order in diameter) or microcrystals were used. 13,14,16,17 However, it is hard to use such large particles or microcrystals as luminescent probes for tissue or cellular imaging. To ensure a fair comparison of the spatial resolution in luminescence imaging with the skin tissue phantom described later, we decided to use the linear response region of the 1550-nm excitation because the luminescence response under 980-nm excitation was linear in the entire excitation intensity region.…”

“…11,12 In this letter, we report that using the excitation of Er 3þdoped nanoparticles in the 1550-nm wavelength region allows us to perform deep tissue imaging with reduced degradation of spatial resolution. Although the upconversion photoluminescence properties of Er 3þ -doped phosphors under 1550-nm excitation have been already studied previously, 13,14 the imaging properties in using the 1550-nm excitation of Er 3þ -doped nanoparticles remain unclear. In deep tissue imaging, the spatial resolution is degraded due to a variety of reasons, including optical aberrations, light scattering, and so on.…”