Microwave-assisted hydrothermal synthesis and temperature sensing application of Er3+/Yb3+ doped NaY(WO4)2 microstructures

Effects of Er 3+ concentration on down-/up-conversion luminescence and temperature sensing properties in NaGdTiO 4 : Er 3+ /Yb 3+ phosphors

“…Compared with conventional temperature measurement methods, the non-contact FIR technique could offer excellent temperature measurement accuracy and is especially suitable for the temperature detection in the electromagnetically and thermally harsh environments [7]. The temperature sensing behaviors of different RE 3+ such as Er 3+ , Tm 3+ , Ho 3+ and Pr 3+ used as temperature probes have been widely reported [8][9][10][11][12][13][14]. Among these ions, Er 3+ is the most popular one for temperature sensing due to its two special thermally coupled energy levels 2 H 11/2 and 4 S 3/2 with a small energy gap of about 770 cm -1 .…”

Comparative study on upconversion luminescence and temperature sensing of α- and β-NaYF4:Yb3+/Er3+ nano-/micro-crystals derived from a microwave-assisted hydrothermal route

“…Finally, the time interval between each two adjacent measurements was set to be long enough to ensure that the sample has been cooled down to room temperature before each measurement. In this case, the thermal effect induced by laser irradiation can be avoided expectedly [19]. Fig.…”

“…have been employed to synthesize RE-doped NaYF 4 material [8][9][10][13][14][15][16][17][18]. Microwave hydrothermal is an improved hydrothermal synthesis approach and increasingly applied in the preparation of micro-/nano-sized materials [17][18][19]. Compared with the conventional hydrothermal method, microwave-assisted hydrothermal has some obvious advantages, such as higher heating rates, shorter reaction time, better controlling of the reaction parameters, higher yields, and excellent reproducibility due to its unique thermal effect induced by microwave heating [19].…”

Optical investigation in shuttle like BaMoO4:Er3+–Yb3+ phosphor in display and temperature sensing

“…The two green colour emitting levels ( 2 H 11/2 and 4 S 3/2 ) from Er 3+ in the present host are thermally coupled (∼716 cm −1 ) and the population of these two levels are affected by change in temperature. The variation in intensity for both the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions has been observed and a quasi-thermal equilibrium arises between them, following a Boltzmann-type population distribution [46][47][48]. Therefore, intensity ratio of these two green colour emitting transitions can be used in the measurement of accurate temperature.…”