Morphology control and temperature sensing properties of micro‐rods NaLa(WO₄)₂:Yb³⁺,Er³⁺ phosphors

Abstract

Over the decades, lanthanide (Ln 3+)-doped materials have been widely applied in broad areas owing to the excellent optical, electrical, and magnetic properties, such as color display, solar cells, detection technology, and temperature sensors. 1-9 Recently, Ln 3+-doped materials have attracted significant attention in the area of biotechnology as fluorescent and thermal probes. Temperature is an essential fundamental and physical parameter, its fluctuation can be used to reveal the physiology and pathology of a living cell or cancer cell. Therefore, accurate measurement of temperature is great significance to biotechnology filed. Ln 3+-doped optical thermal probes possessing superior thermal and photostability, which can realize temperature measurement by a noncontact way, 10-12 present higher thermal sensitivity and faster response than traditional temperature measurement devices. This optical temperature sensor is mainly achieved by analyzing the fluorescence intensity ratio of two emissions from two thermally coupled emitting energy levels of RE 3+ populated on basis of

Hydrothermal synthesis, morphology control and tunable luminescence properties of AgTbW2O8:Eu3+ phosphors

“…Most researchers use a high-temperature solid-state method, 29,30 although this method is simple to operate, the temperature required for the reaction is high and the energy consumption is large, the obtained products easily agglomerate, the morphology is irregular and the particle size distribution is uneven. Some researchers have also used a solvothermal method, 31 this method has a complex reaction environment and the reaction process is difficult to control. In recent years, the hydrothermal method as a promising synthesis method has been welcomed by researchers because of its simple equipment and process, mild reaction conditions, environmental friendliness, low cost and large-scale synthesis.…”

Upconversion luminescence and temperature sensing properties of Yb2(MoO4)3:Ln3+ (Ln = Ho, Tm, Er) phosphors based on energy transfer

“…This technology is also the best optical temperature measurement method at present. 20 Among rare earth ions, the ratio of the two energy levels of Er 3+ ( 2 H 11/2 / 4 S 3/2 ) changes greatly with temperature and has a good temperature effect, and so, Er 3+ doped UC luminescent materials have better temperature sensitivity. 16 Doping rare earth ions in a suitable matrix is the key to achieving UC luminescence efficiency and good optical properties.…”

Preparation and Research on the Optical Temperature Sensing Properties of Ho3+ doped NaY(MoO4)2 Phosphors

“…Among non‐contact methods of temperature measurement, rare earth ions (Re 3+ ) activated, based on fluorescence intensity ratio (FIR) type optical temperature sensing materials can be applied to a large number of extreme environments with little restriction. High accuracy and fast response of the materials have already been demonstrated in scientific applications [7–11] . Common FIR type optical temperature sensing materials select Er 3+ as the activating ion that mainly relies on the excitation of infrared light at 980 nm, so the excitation power of the excitation light needs to be strictly controlled during the temperature measurement process in order to reducing the influence of thermal effects.…”