Temperature Sensing with Up-Converting Submicron-Sized LiNbO₃:Er³⁺/Yb³⁺Particles

Abstract

We present the temperature dependence of the green up-converted luminescence in submicron-sized LiNbO 3 :Er 3þ /Yb 3þ particles in the range between 12 and 180 C. It is shown that LiNbO 3 :Er 3þ /Yb 3þ exhibits a very high sensitivity (S ¼ 0:007/ C at physiological temperature and a maximum value of S ¼ 0:014/ C at 350 C) that surpasses those previously found for other materials based on Er 3þ /Yb 3þ luminescence, indicating that LiNbO 3 :Er 3þ /Yb 3þ is a suitable probe for optical temperature sensing through the fluorescence intensity ratio technique. This high sensitivity can be explained using the intrinsic spectroscopic parameters of Er 3þ ions in this host.

Yb3+/Er3+ co-doped CaMoO4: a promising green upconversion phosphor for optical temperature sensing

“…For example, Yang et al reported that in La 2 (WO 4 ) 3 host the C value is 18.1 [24], while Rai and Swart et al found that, in SrWO 4 host, the C value is as high as 21.1 [21]. The highest C value reported so far is about 32, appeared in the submicron-sized LiNbO 3 particles prepared by Cantelar et al [25]. However, owing to the high mismatch in ionic radius and valence, LiNbO 3 can accommodate merely lowconcentration doping of RE ions, therefore cannot yield bright upconversion emission.…”

Optimizing infrared to near infrared upconversion quantum yield of β-NaYF4:Er3+ in fluoropolymer matrix for photovoltaic devices

“…[3][4][5][6][7][8][9] UC refers to an anti-Stokes type nonlinear optical emission process in which one higher energy photon is emitted for every two or more absorbed lower energy photons. 10 Since the first experimental demonstration in 1966, 11 this effect has received renewed interest due to its ever expanding application base in, for example, lasing, 12 laser cooling, 13 temperature sensing, 14 biomedical imaging and therapy, 15,16 3D displays, 17 and, more recently, for broadening the spectral response of PV devices. [4][5][6][7][8][9] In the context of Si PV devices, the UC of the sub-bandgap photons (k > 1100 nm) into above-bandgap photons (k < 1100 nm) increases the theoretical efficiency limit of a single-junction Si solar cell from near 30% up to 40% when illuminated under non-concentrated light.…”

Bottom-up synthesis of up-converting submicron-sized Er3+-doped LiNbO3 particles

“…Such kind of differences have been previously observed in other sub-micron sized particles and they can be attributed to a heating effect due to the presence of the IR-pumping beam [35]. In particular, it has been recently proved that this effect is useful to estimate the local temperature of the sample [36]. Following these calculations, the differences observed in the relative intensities are consistent with a local temperature, just in the excitation disk, of around 326 K. The power dependence of the most intense emission bands has also been explored; the results are presented in a logarithmic plot in Fig.…”